DataSourceControl.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / DataSourceControl.cs / 1 / 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() 
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public abstract class DataSourceControl : Control, IDataSource, IListSource {

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

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