DataSourceControl.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / DataSourceControl.cs / 1305376 / DataSourceControl.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Web.UI {
 
    using System.Collections; 
    using System.ComponentModel;
    using System.Security.Permissions; 


    /// 
    /// A DataSourceControl represents a data source that can be used to 
    /// data-bind a DataBoundControl.
    /// DataSourceControl is an abstract base class that defines the 
    /// interface between a DataBoundControl and its data source. 
    /// The design of DataSourceControl enables creation of a variety of
    /// data controls with different underlying data sources such 
    /// as SqlDataControl, WebServiceDataControl, XmlDataControl etc.
    /// The data source is implemented as a control even though it
    /// has no visual rendering, to allow it to be persisted
    /// declaratively, and to allow it to participate in state 
    /// management should it choose to.
    /// In abstract terms a DataSourceControl has an underlying data source. 
    /// This data source may contain one or more lists of data within it. 
    /// Each list is associated with a name and at the bare minimum
    /// supports enumeration via the IEnumerable interface. A DataBoundControl 
    /// is typically bound to a single list within the DataControl.
    /// 
    [
    Bindable(false), 
    ControlBuilder(typeof(DataSourceControlBuilder)),
    Designer("System.Web.UI.Design.DataSourceDesigner, " + AssemblyRef.SystemDesign), 
    NonVisualControl() 
    ]
    public abstract class DataSourceControl : Control, IDataSource, IListSource { 

        private static readonly object EventDataSourceChanged = new object();
        private static readonly object EventDataSourceChangedInternal = new object();
 
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never), 
        ]
        public override string ClientID { 
            get {
                return base.ClientID;
            }
        } 

        [ 
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        EditorBrowsable(EditorBrowsableState.Never), 
        ]
        public override ClientIDMode ClientIDMode {
            get {
                return base.ClientIDMode; 
            }
            set { 
                throw new NotSupportedException(); 
            }
        } 

        [
        EditorBrowsable(EditorBrowsableState.Never),
        ] 
        public override ControlCollection Controls {
            get { 
                return base.Controls; 
            }
        } 

        [
        Browsable(false),
        DefaultValue(false), 
        EditorBrowsable(EditorBrowsableState.Never),
        ] 
        public override bool EnableTheming { 
            get {
                return false; 
            }
            set {
                throw new NotSupportedException(SR.GetString(SR.NoThemingSupport, this.GetType().Name));
            } 
        }
 
        [ 
        Browsable(false),
        DefaultValue(""), 
        EditorBrowsable(EditorBrowsableState.Never),
        ]
        public override string SkinID {
            get { 
                return String.Empty;
            } 
            set { 
                throw new NotSupportedException(SR.GetString(SR.NoThemingSupport, this.GetType().Name));
            } 
        }

        /// 
        /// Gets or sets a value that indicates whether a control should be rendered on 
        /// the page.
        ///  
        [ 
        Browsable(false),
        DefaultValue(false), 
        EditorBrowsable(EditorBrowsableState.Never),
        ]
        public override bool Visible {
            get { 
                return false;
            } 
            set { 
                throw new NotSupportedException(SR.GetString(SR.ControlNonVisual, this.GetType().Name));
            } 
        }

        /// 
        /// Raised internally by a DataSource when data-related state is 
        /// changed. DataSourceViews attach to this event so that they can
        /// be notified when the parent data source changes. 
        /// This event is separate from DataSourceChanged because the DataSourceView 
        /// attaches to it and fires its DataSourceViewChanged event.  We want that
        /// to fire before the DataSourceChanged event. 
        /// 
        internal event EventHandler DataSourceChangedInternal {
            add {
                Events.AddHandler(EventDataSourceChangedInternal, value); 
            }
            remove { 
                Events.RemoveHandler(EventDataSourceChangedInternal, value); 
            }
        } 


        [
        EditorBrowsable(EditorBrowsableState.Never), 
        ]
        public override void ApplyStyleSheetSkin(Page page) { 
            base.ApplyStyleSheetSkin(page); 
        }
 
        /// 
        /// Overidden to prevent child controls from being added to this control.
        /// 
        protected override ControlCollection CreateControlCollection() { 
            return new EmptyControlCollection(this);
        } 
 
        [
        EditorBrowsable(EditorBrowsableState.Never), 
        ]
        public override Control FindControl(string id) {
            return base.FindControl(id);
        } 

        ///  
        ///  
        [
        EditorBrowsable(EditorBrowsableState.Never), 
        ]
        public override void Focus() {
            throw new NotSupportedException(SR.GetString(SR.NoFocusSupport, this.GetType().Name));
        } 

        protected abstract DataSourceView GetView(string viewName); 
 
        protected virtual ICollection GetViewNames() {
            return null; 
        }

        [
        EditorBrowsable(EditorBrowsableState.Never), 
        ]
        public override bool HasControls() { 
            return base.HasControls(); 
        }
 
        private void OnDataSourceChanged(EventArgs e) {
            EventHandler handler = (EventHandler)Events[EventDataSourceChanged];
            if (handler != null) {
                handler(this, e); 
            }
        } 
 
        private void OnDataSourceChangedInternal(EventArgs e) {
            EventHandler handler = (EventHandler)Events[EventDataSourceChangedInternal]; 
            if (handler != null) {
                handler(this, e);
            }
        } 

        protected virtual void RaiseDataSourceChangedEvent(EventArgs e) { 
            OnDataSourceChangedInternal(e); 
            OnDataSourceChanged(e);
        } 

        [
        EditorBrowsable(EditorBrowsableState.Never),
        ] 
        public override void RenderControl(HtmlTextWriter writer) {
            base.RenderControl(writer); 
        } 

 
        #region Implementation of IDataSource
        /// 
        ///   Raised when the underlying data source has changed. The
        ///   change may be due to a change in the control's properties, 
        ///   or a change in the data due to an edit action performed by
        ///   the DataSourceControl. 
        ///  
        event EventHandler IDataSource.DataSourceChanged {
            add { 
                Events.AddHandler(EventDataSourceChanged, value);
            }
            remove {
                Events.RemoveHandler(EventDataSourceChanged, value); 
            }
        } 
 

        ///  
        DataSourceView IDataSource.GetView(string viewName) {
            return GetView(viewName);
        }
 

        ///  
        ICollection IDataSource.GetViewNames() { 
            return GetViewNames();
        } 
        #endregion


        #region Implementation of IListSource 

        ///  
        bool IListSource.ContainsListCollection { 
            get {
                if (DesignMode) { 
                    return false;
                }
                return ListSourceHelper.ContainsListCollection(this);
            } 
        }
 
 
        /// 
        IList IListSource.GetList() { 
            if (DesignMode) {
                return null;
            }
            return ListSourceHelper.GetList(this); 
        }
        #endregion 
    } 

} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DataSourceControl.cs source code in C# .NET

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