Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / xsp / System / Web / UI / WebControls / CompositeDataBoundControl.cs / 1 / CompositeDataBoundControl.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.Collections; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public abstract class CompositeDataBoundControl : DataBoundControl, INamingContainer { internal const string ItemCountViewStateKey = "_!ItemCount"; public override ControlCollection Controls { get { EnsureChildControls(); return base.Controls; } } ////// Overriden by DataBoundControl to determine if the control should /// recreate its control hierarchy based on values in view state. /// If the control hierarchy should be created, i.e. view state does /// exist, it calls CreateChildControls with a dummy (empty) data source /// which is usable for enumeration purposes only. /// protected internal override void CreateChildControls() { Controls.Clear(); object controlCount = ViewState[ItemCountViewStateKey]; if (controlCount == null && RequiresDataBinding) { EnsureDataBound(); } if (controlCount != null && ((int)controlCount) != -1) { DummyDataSource dummyDataSource = new DummyDataSource((int)controlCount); CreateChildControls(dummyDataSource, false); ClearChildViewState(); } } ////// Performs the work of creating the control hierarchy based on a data source. /// When dataBinding is true, the specified data source contains real /// data, and the data is supposed to be pushed into the UI. /// When dataBinding is false, the specified data source is a dummy data /// source, that allows enumerating the right number of items, but the items /// themselves are null and do not contain data. In this case, the recreated /// control hierarchy reinitializes its state from view state. /// It enables a DataBoundControl to encapsulate the logic of creating its /// control hierarchy in both modes into a single code path. /// /// /// The data source to be used to enumerate items. /// /// /// Whether the method has been called from DataBind or not. /// ////// The number of items created based on the data source. Put another way, its /// the number of items enumerated from the data source. /// protected abstract int CreateChildControls(IEnumerable dataSource, bool dataBinding); ////// Overriden by DataBoundControl to use its properties to determine the real /// data source that the control should bind to. It then clears the existing /// control hierarchy, and calls createChildControls to create a new control /// hierarchy based on the resolved data source. /// The implementation resolves various data source related properties to /// arrive at the appropriate IEnumerable implementation to use as the real /// data source. /// When resolving data sources, the DataSourceControlID takes highest precedence. /// In this mode, DataMember is used to access the appropriate list from the /// DataControl. /// If DataSourceControlID is not set, the value of the DataSource property is used. /// In this second alternative, DataMember is used to extract the appropriate /// list if the control has been handed an IListSource as a data source. /// protected internal override void PerformDataBinding(IEnumerable data) { base.PerformDataBinding(data); Controls.Clear(); ClearChildViewState(); TrackViewState(); int controlCount = CreateChildControls(data, true); ChildControlsCreated = true; ViewState[ItemCountViewStateKey] = controlCount; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.Collections; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public abstract class CompositeDataBoundControl : DataBoundControl, INamingContainer { internal const string ItemCountViewStateKey = "_!ItemCount"; public override ControlCollection Controls { get { EnsureChildControls(); return base.Controls; } } ////// Overriden by DataBoundControl to determine if the control should /// recreate its control hierarchy based on values in view state. /// If the control hierarchy should be created, i.e. view state does /// exist, it calls CreateChildControls with a dummy (empty) data source /// which is usable for enumeration purposes only. /// protected internal override void CreateChildControls() { Controls.Clear(); object controlCount = ViewState[ItemCountViewStateKey]; if (controlCount == null && RequiresDataBinding) { EnsureDataBound(); } if (controlCount != null && ((int)controlCount) != -1) { DummyDataSource dummyDataSource = new DummyDataSource((int)controlCount); CreateChildControls(dummyDataSource, false); ClearChildViewState(); } } ////// Performs the work of creating the control hierarchy based on a data source. /// When dataBinding is true, the specified data source contains real /// data, and the data is supposed to be pushed into the UI. /// When dataBinding is false, the specified data source is a dummy data /// source, that allows enumerating the right number of items, but the items /// themselves are null and do not contain data. In this case, the recreated /// control hierarchy reinitializes its state from view state. /// It enables a DataBoundControl to encapsulate the logic of creating its /// control hierarchy in both modes into a single code path. /// /// /// The data source to be used to enumerate items. /// /// /// Whether the method has been called from DataBind or not. /// ////// The number of items created based on the data source. Put another way, its /// the number of items enumerated from the data source. /// protected abstract int CreateChildControls(IEnumerable dataSource, bool dataBinding); ////// Overriden by DataBoundControl to use its properties to determine the real /// data source that the control should bind to. It then clears the existing /// control hierarchy, and calls createChildControls to create a new control /// hierarchy based on the resolved data source. /// The implementation resolves various data source related properties to /// arrive at the appropriate IEnumerable implementation to use as the real /// data source. /// When resolving data sources, the DataSourceControlID takes highest precedence. /// In this mode, DataMember is used to access the appropriate list from the /// DataControl. /// If DataSourceControlID is not set, the value of the DataSource property is used. /// In this second alternative, DataMember is used to extract the appropriate /// list if the control has been handed an IListSource as a data source. /// protected internal override void PerformDataBinding(IEnumerable data) { base.PerformDataBinding(data); Controls.Clear(); ClearChildViewState(); TrackViewState(); int controlCount = CreateChildControls(data, true); ChildControlsCreated = true; ViewState[ItemCountViewStateKey] = controlCount; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SystemGatewayIPAddressInformation.cs
- RightsManagementPermission.cs
- Duration.cs
- MethodExpression.cs
- PersonalizablePropertyEntry.cs
- DateTimeFormatInfo.cs
- TraceContextEventArgs.cs
- ComponentGlyph.cs
- PixelFormatConverter.cs
- XmlTypeMapping.cs
- WebPartDisplayModeCollection.cs
- ButtonFieldBase.cs
- loginstatus.cs
- ContentValidator.cs
- TemplateParser.cs
- TreeNodeMouseHoverEvent.cs
- TextShapeableCharacters.cs
- GenericFlowSwitchHelper.cs
- FormatterServices.cs
- CodeTypeParameterCollection.cs
- GregorianCalendar.cs
- AccessDataSourceDesigner.cs
- StatusBarAutomationPeer.cs
- LinqDataSourceValidationException.cs
- PeerCustomResolverBindingElement.cs
- HttpRuntime.cs
- Privilege.cs
- Header.cs
- InitializationEventAttribute.cs
- SystemIcmpV6Statistics.cs
- ClientBuildManagerTypeDescriptionProviderBridge.cs
- GenericUriParser.cs
- Stack.cs
- PanelStyle.cs
- BasicAsyncResult.cs
- Helpers.cs
- HotCommands.cs
- ComponentChangingEvent.cs
- XsltLibrary.cs
- DBBindings.cs
- ContainerVisual.cs
- DependencyObject.cs
- BasicExpandProvider.cs
- SqlDataSourceQueryEditor.cs
- DataGridViewLinkCell.cs
- TagMapInfo.cs
- SerializerProvider.cs
- NotifyCollectionChangedEventArgs.cs
- CustomWebEventKey.cs
- EventData.cs
- SAPIEngineTypes.cs
- StackBuilderSink.cs
- SqlCacheDependencySection.cs
- SchemaLookupTable.cs
- HandleCollector.cs
- TypeElement.cs
- TrustManager.cs
- PhysicalOps.cs
- ToolStripDropDownButton.cs
- Operand.cs
- DurableEnlistmentState.cs
- CodeExpressionStatement.cs
- FormViewCommandEventArgs.cs
- PrinterSettings.cs
- AttributeEmitter.cs
- EncryptedKey.cs
- TableParaClient.cs
- BaseTransportHeaders.cs
- CombinedHttpChannel.cs
- TextTabProperties.cs
- EntityClientCacheEntry.cs
- RunInstallerAttribute.cs
- XamlInterfaces.cs
- GroupLabel.cs
- HebrewNumber.cs
- InheritanceContextChangedEventManager.cs
- KernelTypeValidation.cs
- JsonReader.cs
- Vector3DAnimation.cs
- IBuiltInEvidence.cs
- MessageSmuggler.cs
- QueryConverter.cs
- RankException.cs
- ContentElementAutomationPeer.cs
- XmlStringTable.cs
- Int32Storage.cs
- DebugViewWriter.cs
- EventListenerClientSide.cs
- Stylesheet.cs
- Nullable.cs
- ActiveXMessageFormatter.cs
- GenericFlowSwitchHelper.cs
- IMembershipProvider.cs
- SafeArrayRankMismatchException.cs
- AttachedPropertyBrowsableWhenAttributePresentAttribute.cs
- CodeGroup.cs
- TargetInvocationException.cs
- PanelStyle.cs
- FacetEnabledSchemaElement.cs
- Icon.cs