ObjectListDesigner.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / Design / ObjectListDesigner.cs / 1305376 / ObjectListDesigner.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.Design.MobileControls 
{ 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Diagnostics;
    using System.Data; 
    using System.Drawing;
    using System.Drawing.Design; 
    using System.IO; 
    using System.Text;
    using System.Web.UI; 
    using System.Web.UI.Design;
    using System.Web.UI.MobileControls;
    using System.Web.UI.WebControls;
    using System.Windows.Forms; 

    using System.Web.UI.MobileControls.Adapters; 
    using System.Web.UI.Design.MobileControls.Adapters; 

    using DataBinding = System.Web.UI.DataBinding; 

    [
        System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand,
        Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode) 
    ]
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] 
    internal class ObjectListDesigner : MobileTemplatedControlDesigner, IDataSourceProvider, IMobileDesigner 
    {
        private DataTable _dummyDataTable; 
        private DataTable _designTimeDataTable;

        private System.Web.UI.MobileControls.ObjectList _objectList;
        private DesignerVerbCollection _designerVerbs; 

        private const String _dataSourcePropertyName    = "DataSource"; 
        private const String _dataMemberPropertyName    = "DataMember"; 

        private const int _headerFooterTemplates            = 0; 
        private const int _itemTemplates                    = 1;
        private const int _separatorTemplate                = 2;
        private const int _numberOfTemplateFrames           = 3;
 
        private static readonly String[][] _templateFrameNames =
            new String[][] { 
                               new String [] { Constants.HeaderTemplateTag, Constants.FooterTemplateTag }, 
                               new String [] { Constants.ItemTemplateTag, Constants.AlternatingItemTemplateTag, Constants.ItemDetailsTemplateTag },
                               new String [] { Constants.SeparatorTemplateTag }, 
                           };

        private static readonly Attribute[] _emptyAttrs = new Attribute[0];
 
        /// 
        ///     
        ///       Initializes the designer. 
        ///    
        ///  
        /// 
        ///    The control element being designed.
        /// 
        ///  
        ///    
        ///       This is called by the designer host to establish the component being 
        ///       designed. 
        ///    
        ///  
        /// 
        public override void Initialize(IComponent component)
        {
            Debug.Assert(component is System.Web.UI.MobileControls.ObjectList, 
                         "ObjectListDesigner.Initialize - Invalid ObjectList Control");
 
            _objectList = (System.Web.UI.MobileControls.ObjectList) component; 
            base.Initialize(component);
        } 

        protected override String[] GetTemplateFrameNames(int index)
        {
            Debug.Assert(index >= 0 & index <= _templateFrameNames.Length); 
            return _templateFrameNames[index];
        } 
 
        protected override TemplateEditingVerb[] GetTemplateVerbs()
        { 
            TemplateEditingVerb[] templateVerbs = new TemplateEditingVerb[_numberOfTemplateFrames];

            templateVerbs[_headerFooterTemplates] = new TemplateEditingVerb(
                SR.GetString(SR.TemplateFrame_HeaderFooterTemplates), 
                _headerFooterTemplates,
                this); 
            templateVerbs[_itemTemplates] = new TemplateEditingVerb( 
                SR.GetString(SR.TemplateFrame_ItemTemplates),
                _itemTemplates, 
                this);
            templateVerbs[_separatorTemplate] = new TemplateEditingVerb(
                SR.GetString(SR.TemplateFrame_SeparatorTemplate),
                _separatorTemplate, 
                this);
 
            return templateVerbs; 
        }
 
        /// 
        ///    
        ///       Gets the HTML to be used for the design time representation
        ///       of the control. 
        ///    
        ///  
        ///  
        ///    
        ///       The design time HTML. 
        ///    
        /// 
        protected override String GetDesignTimeNormalHtml()
        { 
            int sampleRows = 5;
            bool dummyDataSource = false; 
            String oldLabelField, oldTableFields; 
            oldLabelField = _objectList.LabelField;
            oldTableFields = _objectList.TableFields; 

            DesignerTextWriter htmlWriter = new DesignerTextWriter(true);

            if (_objectList.DeviceSpecific != null) 
            {
                _objectList.DeviceSpecific.SetDesignerChoice(CurrentChoice); 
            } 

            IEnumerable designTimeDataSource = GetDesignTimeDataSource(sampleRows, out dummyDataSource); 

            bool oldAutoGenerateFields = _objectList.AutoGenerateFields;
            if ((oldAutoGenerateFields == false) && (_objectList.Fields.Count == 0))
            { 
                // ensure that AutoGenerateFields is true when we don't have
                // any fields defined, so we see atleast something at design time. 
                _objectList.AutoGenerateFields = true; 
            }
 
            // Replace original labelfield with empty string to ensure dummy datasource will be rendered
            if (dummyDataSource)
            {
                _objectList.LabelField  = String.Empty; 
                _objectList.TableFields = String.Empty;
            } 
 
            try
            { 
                _objectList.DataSource = designTimeDataSource;
                _objectList.DataBind();
                _objectList.Adapter.Render(htmlWriter);
            } 
            finally
            { 
                _objectList.DataSource = null; 
                _objectList.AutoGenerateFields = oldAutoGenerateFields;
 
                if (dummyDataSource)
                {
                    _objectList.LabelField = oldLabelField;
                    _objectList.TableFields = oldTableFields; 
                }
 
                // Remove controls created by databinding the DataSource 
                _objectList.Controls.Clear();
                _objectList.InvalidateDisplayFieldIndices(); 
            }

            return htmlWriter.ToString();
        } 

        ///  
        ///     
        ///       Represents the method that will handle the component change event.
        ///     
        /// 
        /// 
        ///    The source of the event.
        ///  
        /// 
        ///    The  that provides data about the event. 
        ///  
        public override void OnComponentChanged(Object sender, ComponentChangedEventArgs e)
        { 
            if (e.Member != null)
            {
                String memberName = e.Member.Name;
                if (memberName.Equals(_dataSourcePropertyName) || 
                    memberName.Equals(_dataMemberPropertyName))
                { 
                    OnDataSourceChanged(); 
                }
            } 

            base.OnComponentChanged(sender, e);
        }
 
        /////////////////////////////////////////////////////////////////////////
        //  BEGIN OBJECTLIST DESIGNER DATASOURCE HANDLING 
        ///////////////////////////////////////////////////////////////////////// 

        ///  
        ///    
        ///       Filter the properties to replace the runtime DataSource property
        ///       descriptor with the designer's.
        ///     
        /// 
        ///  
        ///    The set of properties to filter. 
        /// 
        ///  
        protected override void PreFilterProperties(IDictionary properties)
        {
            base.PreFilterProperties(properties);
 
            Type designerType = this.GetType();
 
            DesignerAdapterUtil.AddAttributesToPropertiesOfDifferentType( 
                designerType,
                typeof(String), 
                properties,
                _dataSourcePropertyName,
                new TypeConverterAttribute(typeof(DataSourceConverter)));
 
            DesignerAdapterUtil.AddAttributesToProperty(
                designerType, 
                properties, 
                _dataMemberPropertyName,
                _emptyAttrs); 
        }

        public String DataMember
        { 
            get
            { 
                return _objectList.DataMember; 
            }
            set 
            {
                _objectList.DataMember = value;
                OnDataSourceChanged();
            } 
        }
 
        ///  
        ///    
        ///       Gets or sets the data source property. 
        ///    
        /// 
        /// 
        ///     
        ///       A string indicating the data source for the designer's control.
        ///     
        ///  
        /// 
        ///     
        ///       Designer implementation of a DataSource property that operates on the
        ///       DataSource property in the control's binding collection.
        ///    
        ///  
        public String DataSource
        { 
            get 
            {
                DataBinding binding = DataBindings[_dataSourcePropertyName]; 

                if (binding != null)
                {
                    return binding.Expression; 
                }
                return String.Empty; 
            } 
            set
            { 
                if ((value == null) || (value.Length == 0))
                {
                    DataBindings.Remove(_dataSourcePropertyName);
                } 
                else
                { 
                    DataBinding binding = DataBindings[_dataSourcePropertyName]; 

                    if (binding == null) 
                    {
                        binding = new DataBinding(
                                      _dataSourcePropertyName,
                                      typeof(IEnumerable), 
                                      value);
                    } 
                    else 
                    {
                        binding.Expression = value; 
                    }
                    DataBindings.Add(binding);
                }
 
                OnDataSourceChanged();
                OnBindingsCollectionChanged(_dataSourcePropertyName); 
            } 
        }
 
        /// 
        ///    
        ///       Gets sample data matching the schema of the selected data source.
        ///     
        /// 
        ///  
        ///    The minimum rows of sample data the data source data should contain. 
        /// 
        ///  
        ///    Whether the data source being returned is a dummy data source.
        /// 
        /// 
        ///     
        ///       An IEnumerable containing a live data source for use at
        ///       design time. 
        ///     
        /// 
        /// 
        private IEnumerable GetDesignTimeDataSource(int minimumRows, out bool dummyDataSource)
        {
            IEnumerable selectedDataSource = GetResolvedSelectedDataSource();
            return GetDesignTimeDataSource(selectedDataSource, minimumRows, out dummyDataSource); 
        }
 
        ///  
        ///    
        ///       Gets sample data matching the schema of the selected data source. 
        ///    
        /// 
        /// 
        ///    The selected data source to be used as a reference for the shape of the data. 
        /// 
        ///  
        ///    The minimum rows of sample data the data source data should contain. 
        /// 
        ///  
        ///    Whether the data source being returned is a dummy data source.
        /// 
        /// 
        ///     
        ///       An IEnumerable containing
        ///       a live data source for use at design time. 
        ///     
        /// 
        /// 
        private IEnumerable GetDesignTimeDataSource(IEnumerable selectedDataSource, int minimumRows, out bool dummyDataSource)
        {
            DataTable dataTable = _designTimeDataTable;
            dummyDataSource = false; 

            // use the datatable corresponding to the selected datasource if possible 
            if (dataTable == null) 
            {
                if (selectedDataSource != null) 
                {
                    _designTimeDataTable = DesignTimeData.CreateSampleDataTable(selectedDataSource);

                    dataTable = _designTimeDataTable; 
                }
 
                if (dataTable == null) 
                {
                    // fallback on a dummy datasource if we can't create a sample datatable 
                    if (_dummyDataTable == null)
                    {
                        _dummyDataTable = DesignTimeData.CreateDummyDataTable();
                    } 

                    dataTable = _dummyDataTable; 
                    dummyDataSource = true; 
                }
            } 

            IEnumerable liveDataSource = DesignTimeData.GetDesignTimeDataSource(dataTable, minimumRows);
            return liveDataSource;
        } 

        public IEnumerable GetResolvedSelectedDataSource() 
        { 
            IEnumerable selectedDataSource = null;
 
            DataBinding binding = DataBindings[_dataSourcePropertyName];

            if (binding != null)
            { 
                selectedDataSource = DesignTimeData.GetSelectedDataSource(_objectList, binding.Expression, DataMember);
            } 
 
            return selectedDataSource;
        } 

        /// 
        ///    
        ///       Gets the selected data source component from the component's container. 
        ///    
        ///  
        ///  
        ///    
        ///       An IEnumerable with the 
        ///       selected data source, or  if a data source is not found, or if a data
        ///       source with the same name does not exist.
        ///    
        ///  
        /// 
        public Object GetSelectedDataSource() 
        { 
            Object selectedDataSource = null;
 
            DataBinding binding = DataBindings[_dataSourcePropertyName];

            if (binding != null)
            { 
                selectedDataSource = DesignTimeData.GetSelectedDataSource(_objectList, binding.Expression);
            } 
 
            return selectedDataSource;
        } 

        /// 
        ///    
        ///       Gets the template's container's data source. 
        ///    
        ///  
        ///  
        ///    The name of the template to retrieve the data source for.
        ///  
        /// 
        ///    
        ///       An IEnumerable containing the data source or data sources available to
        ///       the template's container. 
        ///    
        ///  
        public override IEnumerable GetTemplateContainerDataSource(String templateName) 
        {
            return GetResolvedSelectedDataSource(); 
        }

        public override String GetTemplateContainerDataItemProperty(string templateName)
        { 
            return "DataItem";
        } 
 
        public override Type GetTemplatePropertyParentType(String templateName)
        { 
            return typeof(MobileTemplatedControlDesigner.TemplateContainer);
        }

        ///  
        /// 
        ///     
        ///       Raises the DataSourceChanged event. 
        ///    
        ///  
        protected internal virtual void OnDataSourceChanged()
        {
            _designTimeDataTable = null;
        } 

        public new void UpdateRendering() 
        { 
            _objectList.LabelStyle.Refresh();
            _objectList.CommandStyle.Refresh(); 

            base.UpdateRendering();
        }
 
        /////////////////////////////////////////////////////////////////////////
        //  END OBJECTLIST DESIGNER DATASOURCE HANDLING 
        ///////////////////////////////////////////////////////////////////////// 

        ///////////////////////////////////////////////////////////////////////// 
        //  BEGIN DESIGNER VERBS
        /////////////////////////////////////////////////////////////////////////

        ///  
        ///    
        ///       The designer's collection of verbs. 
        ///     
        /// 
        ///  
        ///    
        ///       An array of type  containing the verbs available to the
        ///       designer.
        ///     
        /// 
        public override DesignerVerbCollection Verbs 
        { 
            get
            { 
                if (null == _designerVerbs)
                {
                    _designerVerbs = base.Verbs;
                    _designerVerbs.Add(new DesignerVerb(SR.GetString(SR.PropertyBuilderVerb), 
                                                        new EventHandler(this.OnPropertyBuilder)));
                } 
                Debug.Assert(_designerVerbs.Count == 2); 

                _designerVerbs[0].Enabled = !this.InTemplateMode; 
                _designerVerbs[1].Enabled = !this.InTemplateMode;
                return _designerVerbs;
            }
        } 

        ///////////////////////////////////////////////////////////////////////// 
        //  BEGIN OBJECTLIST DESIGNER EVENTHANDLERS 
        /////////////////////////////////////////////////////////////////////////
 
        /// 
        ///    
        ///       Represents the method that will handle the property builder event.
        ///     
        /// 
        ///  
        ///    The source of the event. 
        /// 
        ///  
        ///    An EventArgs object that provides data about the event.
        /// 
        protected void OnPropertyBuilder(Object sender, EventArgs e)
        { 
            InvokePropertyBuilder(0);
        } 
 
        /// 
        ///     
        ///       Invokes the property builder beginning with the specified page.
        ///    
        /// 
        ///  
        ///    The page to begin with.
        ///  
        protected internal void InvokePropertyBuilder(int initialPage) 
        {
            IComponentChangeService changeService = null; 
            bool result = false;

            changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));
            if (changeService != null) 
            {
                try 
                { 
                    changeService.OnComponentChanging(_objectList, null);
                } 
                catch (CheckoutException ex)
                {
                    if (ex == CheckoutException.Canceled)
                    { 
                        return;
                    } 
                    throw; 
                }
            } 

            try
            {
                ObjectListComponentEditor compEditor = new ObjectListComponentEditor(initialPage); 
                result = compEditor.EditComponent(_objectList);
            } 
            finally 
            {
                if (changeService != null) 
                {
                    changeService.OnComponentChanged(_objectList, null, null, null);

                    if (IMobileWebFormServices != null) 
                    {
                        IMobileWebFormServices.ClearUndoStack(); 
                    } 
                }
            } 
        }

        /////////////////////////////////////////////////////////////////////////
        //  END STYLE DESIGNER EVENTHANDLERS 
        /////////////////////////////////////////////////////////////////////////
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.Design.MobileControls 
{ 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Diagnostics;
    using System.Data; 
    using System.Drawing;
    using System.Drawing.Design; 
    using System.IO; 
    using System.Text;
    using System.Web.UI; 
    using System.Web.UI.Design;
    using System.Web.UI.MobileControls;
    using System.Web.UI.WebControls;
    using System.Windows.Forms; 

    using System.Web.UI.MobileControls.Adapters; 
    using System.Web.UI.Design.MobileControls.Adapters; 

    using DataBinding = System.Web.UI.DataBinding; 

    [
        System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand,
        Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode) 
    ]
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] 
    internal class ObjectListDesigner : MobileTemplatedControlDesigner, IDataSourceProvider, IMobileDesigner 
    {
        private DataTable _dummyDataTable; 
        private DataTable _designTimeDataTable;

        private System.Web.UI.MobileControls.ObjectList _objectList;
        private DesignerVerbCollection _designerVerbs; 

        private const String _dataSourcePropertyName    = "DataSource"; 
        private const String _dataMemberPropertyName    = "DataMember"; 

        private const int _headerFooterTemplates            = 0; 
        private const int _itemTemplates                    = 1;
        private const int _separatorTemplate                = 2;
        private const int _numberOfTemplateFrames           = 3;
 
        private static readonly String[][] _templateFrameNames =
            new String[][] { 
                               new String [] { Constants.HeaderTemplateTag, Constants.FooterTemplateTag }, 
                               new String [] { Constants.ItemTemplateTag, Constants.AlternatingItemTemplateTag, Constants.ItemDetailsTemplateTag },
                               new String [] { Constants.SeparatorTemplateTag }, 
                           };

        private static readonly Attribute[] _emptyAttrs = new Attribute[0];
 
        /// 
        ///     
        ///       Initializes the designer. 
        ///    
        ///  
        /// 
        ///    The control element being designed.
        /// 
        ///  
        ///    
        ///       This is called by the designer host to establish the component being 
        ///       designed. 
        ///    
        ///  
        /// 
        public override void Initialize(IComponent component)
        {
            Debug.Assert(component is System.Web.UI.MobileControls.ObjectList, 
                         "ObjectListDesigner.Initialize - Invalid ObjectList Control");
 
            _objectList = (System.Web.UI.MobileControls.ObjectList) component; 
            base.Initialize(component);
        } 

        protected override String[] GetTemplateFrameNames(int index)
        {
            Debug.Assert(index >= 0 & index <= _templateFrameNames.Length); 
            return _templateFrameNames[index];
        } 
 
        protected override TemplateEditingVerb[] GetTemplateVerbs()
        { 
            TemplateEditingVerb[] templateVerbs = new TemplateEditingVerb[_numberOfTemplateFrames];

            templateVerbs[_headerFooterTemplates] = new TemplateEditingVerb(
                SR.GetString(SR.TemplateFrame_HeaderFooterTemplates), 
                _headerFooterTemplates,
                this); 
            templateVerbs[_itemTemplates] = new TemplateEditingVerb( 
                SR.GetString(SR.TemplateFrame_ItemTemplates),
                _itemTemplates, 
                this);
            templateVerbs[_separatorTemplate] = new TemplateEditingVerb(
                SR.GetString(SR.TemplateFrame_SeparatorTemplate),
                _separatorTemplate, 
                this);
 
            return templateVerbs; 
        }
 
        /// 
        ///    
        ///       Gets the HTML to be used for the design time representation
        ///       of the control. 
        ///    
        ///  
        ///  
        ///    
        ///       The design time HTML. 
        ///    
        /// 
        protected override String GetDesignTimeNormalHtml()
        { 
            int sampleRows = 5;
            bool dummyDataSource = false; 
            String oldLabelField, oldTableFields; 
            oldLabelField = _objectList.LabelField;
            oldTableFields = _objectList.TableFields; 

            DesignerTextWriter htmlWriter = new DesignerTextWriter(true);

            if (_objectList.DeviceSpecific != null) 
            {
                _objectList.DeviceSpecific.SetDesignerChoice(CurrentChoice); 
            } 

            IEnumerable designTimeDataSource = GetDesignTimeDataSource(sampleRows, out dummyDataSource); 

            bool oldAutoGenerateFields = _objectList.AutoGenerateFields;
            if ((oldAutoGenerateFields == false) && (_objectList.Fields.Count == 0))
            { 
                // ensure that AutoGenerateFields is true when we don't have
                // any fields defined, so we see atleast something at design time. 
                _objectList.AutoGenerateFields = true; 
            }
 
            // Replace original labelfield with empty string to ensure dummy datasource will be rendered
            if (dummyDataSource)
            {
                _objectList.LabelField  = String.Empty; 
                _objectList.TableFields = String.Empty;
            } 
 
            try
            { 
                _objectList.DataSource = designTimeDataSource;
                _objectList.DataBind();
                _objectList.Adapter.Render(htmlWriter);
            } 
            finally
            { 
                _objectList.DataSource = null; 
                _objectList.AutoGenerateFields = oldAutoGenerateFields;
 
                if (dummyDataSource)
                {
                    _objectList.LabelField = oldLabelField;
                    _objectList.TableFields = oldTableFields; 
                }
 
                // Remove controls created by databinding the DataSource 
                _objectList.Controls.Clear();
                _objectList.InvalidateDisplayFieldIndices(); 
            }

            return htmlWriter.ToString();
        } 

        ///  
        ///     
        ///       Represents the method that will handle the component change event.
        ///     
        /// 
        /// 
        ///    The source of the event.
        ///  
        /// 
        ///    The  that provides data about the event. 
        ///  
        public override void OnComponentChanged(Object sender, ComponentChangedEventArgs e)
        { 
            if (e.Member != null)
            {
                String memberName = e.Member.Name;
                if (memberName.Equals(_dataSourcePropertyName) || 
                    memberName.Equals(_dataMemberPropertyName))
                { 
                    OnDataSourceChanged(); 
                }
            } 

            base.OnComponentChanged(sender, e);
        }
 
        /////////////////////////////////////////////////////////////////////////
        //  BEGIN OBJECTLIST DESIGNER DATASOURCE HANDLING 
        ///////////////////////////////////////////////////////////////////////// 

        ///  
        ///    
        ///       Filter the properties to replace the runtime DataSource property
        ///       descriptor with the designer's.
        ///     
        /// 
        ///  
        ///    The set of properties to filter. 
        /// 
        ///  
        protected override void PreFilterProperties(IDictionary properties)
        {
            base.PreFilterProperties(properties);
 
            Type designerType = this.GetType();
 
            DesignerAdapterUtil.AddAttributesToPropertiesOfDifferentType( 
                designerType,
                typeof(String), 
                properties,
                _dataSourcePropertyName,
                new TypeConverterAttribute(typeof(DataSourceConverter)));
 
            DesignerAdapterUtil.AddAttributesToProperty(
                designerType, 
                properties, 
                _dataMemberPropertyName,
                _emptyAttrs); 
        }

        public String DataMember
        { 
            get
            { 
                return _objectList.DataMember; 
            }
            set 
            {
                _objectList.DataMember = value;
                OnDataSourceChanged();
            } 
        }
 
        ///  
        ///    
        ///       Gets or sets the data source property. 
        ///    
        /// 
        /// 
        ///     
        ///       A string indicating the data source for the designer's control.
        ///     
        ///  
        /// 
        ///     
        ///       Designer implementation of a DataSource property that operates on the
        ///       DataSource property in the control's binding collection.
        ///    
        ///  
        public String DataSource
        { 
            get 
            {
                DataBinding binding = DataBindings[_dataSourcePropertyName]; 

                if (binding != null)
                {
                    return binding.Expression; 
                }
                return String.Empty; 
            } 
            set
            { 
                if ((value == null) || (value.Length == 0))
                {
                    DataBindings.Remove(_dataSourcePropertyName);
                } 
                else
                { 
                    DataBinding binding = DataBindings[_dataSourcePropertyName]; 

                    if (binding == null) 
                    {
                        binding = new DataBinding(
                                      _dataSourcePropertyName,
                                      typeof(IEnumerable), 
                                      value);
                    } 
                    else 
                    {
                        binding.Expression = value; 
                    }
                    DataBindings.Add(binding);
                }
 
                OnDataSourceChanged();
                OnBindingsCollectionChanged(_dataSourcePropertyName); 
            } 
        }
 
        /// 
        ///    
        ///       Gets sample data matching the schema of the selected data source.
        ///     
        /// 
        ///  
        ///    The minimum rows of sample data the data source data should contain. 
        /// 
        ///  
        ///    Whether the data source being returned is a dummy data source.
        /// 
        /// 
        ///     
        ///       An IEnumerable containing a live data source for use at
        ///       design time. 
        ///     
        /// 
        /// 
        private IEnumerable GetDesignTimeDataSource(int minimumRows, out bool dummyDataSource)
        {
            IEnumerable selectedDataSource = GetResolvedSelectedDataSource();
            return GetDesignTimeDataSource(selectedDataSource, minimumRows, out dummyDataSource); 
        }
 
        ///  
        ///    
        ///       Gets sample data matching the schema of the selected data source. 
        ///    
        /// 
        /// 
        ///    The selected data source to be used as a reference for the shape of the data. 
        /// 
        ///  
        ///    The minimum rows of sample data the data source data should contain. 
        /// 
        ///  
        ///    Whether the data source being returned is a dummy data source.
        /// 
        /// 
        ///     
        ///       An IEnumerable containing
        ///       a live data source for use at design time. 
        ///     
        /// 
        /// 
        private IEnumerable GetDesignTimeDataSource(IEnumerable selectedDataSource, int minimumRows, out bool dummyDataSource)
        {
            DataTable dataTable = _designTimeDataTable;
            dummyDataSource = false; 

            // use the datatable corresponding to the selected datasource if possible 
            if (dataTable == null) 
            {
                if (selectedDataSource != null) 
                {
                    _designTimeDataTable = DesignTimeData.CreateSampleDataTable(selectedDataSource);

                    dataTable = _designTimeDataTable; 
                }
 
                if (dataTable == null) 
                {
                    // fallback on a dummy datasource if we can't create a sample datatable 
                    if (_dummyDataTable == null)
                    {
                        _dummyDataTable = DesignTimeData.CreateDummyDataTable();
                    } 

                    dataTable = _dummyDataTable; 
                    dummyDataSource = true; 
                }
            } 

            IEnumerable liveDataSource = DesignTimeData.GetDesignTimeDataSource(dataTable, minimumRows);
            return liveDataSource;
        } 

        public IEnumerable GetResolvedSelectedDataSource() 
        { 
            IEnumerable selectedDataSource = null;
 
            DataBinding binding = DataBindings[_dataSourcePropertyName];

            if (binding != null)
            { 
                selectedDataSource = DesignTimeData.GetSelectedDataSource(_objectList, binding.Expression, DataMember);
            } 
 
            return selectedDataSource;
        } 

        /// 
        ///    
        ///       Gets the selected data source component from the component's container. 
        ///    
        ///  
        ///  
        ///    
        ///       An IEnumerable with the 
        ///       selected data source, or  if a data source is not found, or if a data
        ///       source with the same name does not exist.
        ///    
        ///  
        /// 
        public Object GetSelectedDataSource() 
        { 
            Object selectedDataSource = null;
 
            DataBinding binding = DataBindings[_dataSourcePropertyName];

            if (binding != null)
            { 
                selectedDataSource = DesignTimeData.GetSelectedDataSource(_objectList, binding.Expression);
            } 
 
            return selectedDataSource;
        } 

        /// 
        ///    
        ///       Gets the template's container's data source. 
        ///    
        ///  
        ///  
        ///    The name of the template to retrieve the data source for.
        ///  
        /// 
        ///    
        ///       An IEnumerable containing the data source or data sources available to
        ///       the template's container. 
        ///    
        ///  
        public override IEnumerable GetTemplateContainerDataSource(String templateName) 
        {
            return GetResolvedSelectedDataSource(); 
        }

        public override String GetTemplateContainerDataItemProperty(string templateName)
        { 
            return "DataItem";
        } 
 
        public override Type GetTemplatePropertyParentType(String templateName)
        { 
            return typeof(MobileTemplatedControlDesigner.TemplateContainer);
        }

        ///  
        /// 
        ///     
        ///       Raises the DataSourceChanged event. 
        ///    
        ///  
        protected internal virtual void OnDataSourceChanged()
        {
            _designTimeDataTable = null;
        } 

        public new void UpdateRendering() 
        { 
            _objectList.LabelStyle.Refresh();
            _objectList.CommandStyle.Refresh(); 

            base.UpdateRendering();
        }
 
        /////////////////////////////////////////////////////////////////////////
        //  END OBJECTLIST DESIGNER DATASOURCE HANDLING 
        ///////////////////////////////////////////////////////////////////////// 

        ///////////////////////////////////////////////////////////////////////// 
        //  BEGIN DESIGNER VERBS
        /////////////////////////////////////////////////////////////////////////

        ///  
        ///    
        ///       The designer's collection of verbs. 
        ///     
        /// 
        ///  
        ///    
        ///       An array of type  containing the verbs available to the
        ///       designer.
        ///     
        /// 
        public override DesignerVerbCollection Verbs 
        { 
            get
            { 
                if (null == _designerVerbs)
                {
                    _designerVerbs = base.Verbs;
                    _designerVerbs.Add(new DesignerVerb(SR.GetString(SR.PropertyBuilderVerb), 
                                                        new EventHandler(this.OnPropertyBuilder)));
                } 
                Debug.Assert(_designerVerbs.Count == 2); 

                _designerVerbs[0].Enabled = !this.InTemplateMode; 
                _designerVerbs[1].Enabled = !this.InTemplateMode;
                return _designerVerbs;
            }
        } 

        ///////////////////////////////////////////////////////////////////////// 
        //  BEGIN OBJECTLIST DESIGNER EVENTHANDLERS 
        /////////////////////////////////////////////////////////////////////////
 
        /// 
        ///    
        ///       Represents the method that will handle the property builder event.
        ///     
        /// 
        ///  
        ///    The source of the event. 
        /// 
        ///  
        ///    An EventArgs object that provides data about the event.
        /// 
        protected void OnPropertyBuilder(Object sender, EventArgs e)
        { 
            InvokePropertyBuilder(0);
        } 
 
        /// 
        ///     
        ///       Invokes the property builder beginning with the specified page.
        ///    
        /// 
        ///  
        ///    The page to begin with.
        ///  
        protected internal void InvokePropertyBuilder(int initialPage) 
        {
            IComponentChangeService changeService = null; 
            bool result = false;

            changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));
            if (changeService != null) 
            {
                try 
                { 
                    changeService.OnComponentChanging(_objectList, null);
                } 
                catch (CheckoutException ex)
                {
                    if (ex == CheckoutException.Canceled)
                    { 
                        return;
                    } 
                    throw; 
                }
            } 

            try
            {
                ObjectListComponentEditor compEditor = new ObjectListComponentEditor(initialPage); 
                result = compEditor.EditComponent(_objectList);
            } 
            finally 
            {
                if (changeService != null) 
                {
                    changeService.OnComponentChanged(_objectList, null, null, null);

                    if (IMobileWebFormServices != null) 
                    {
                        IMobileWebFormServices.ClearUndoStack(); 
                    } 
                }
            } 
        }

        /////////////////////////////////////////////////////////////////////////
        //  END STYLE DESIGNER EVENTHANDLERS 
        /////////////////////////////////////////////////////////////////////////
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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