Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / DataSourceView.cs / 1 / DataSourceView.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System.Collections; using System.ComponentModel; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public abstract class DataSourceView { private static readonly object EventDataSourceViewChanged = new object(); private EventHandlerList _events; private string _name; protected DataSourceView(IDataSource owner, string viewName) { if (owner == null) { throw new ArgumentNullException("owner"); } if (viewName == null) { throw new ArgumentNullException("viewName"); } _name = viewName; DataSourceControl dataSourceControl = owner as DataSourceControl; if (dataSourceControl != null) { dataSourceControl.DataSourceChangedInternal += new EventHandler(OnDataSourceChangedInternal); } else { owner.DataSourceChanged += new EventHandler(OnDataSourceChangedInternal); } } // CanX properties indicate whether the data source allows each // operation, and if so, whether it's appropriate to do so. // For instance, a control may allow Deletion, but if a required Delete // command isn't set, CanDelete should be false, because a Delete // operation would fail. public virtual bool CanDelete { get { return false; } } public virtual bool CanInsert { get { return false; } } public virtual bool CanPage { get { return false; } } public virtual bool CanRetrieveTotalRowCount { get { return false; } } public virtual bool CanSort { get { return false; } } public virtual bool CanUpdate { get { return false; } } ////// Indicates the list of event handler delegates for the view. This property is read-only. /// protected EventHandlerList Events { get { if (_events == null) { _events = new EventHandlerList(); } return _events; } } public string Name { get { return _name; } } public event EventHandler DataSourceViewChanged { add { Events.AddHandler(EventDataSourceViewChanged, value); } remove { Events.RemoveHandler(EventDataSourceViewChanged, value); } } public virtual void Delete(IDictionary keys, IDictionary oldValues, DataSourceViewOperationCallback callback) { if (callback == null) { throw new ArgumentNullException("callback"); } int affectedRecords = 0; bool performedCallback = false; try { affectedRecords = ExecuteDelete(keys, oldValues); } catch (Exception ex) { performedCallback = true; if (!callback(affectedRecords, ex)) { throw; } } finally { if (!performedCallback) { callback(affectedRecords, null); } } } ////// Performs a delete operation on the specified list. This is only /// supported by a DataSourceControl when CanDelete returns true. /// /// /// The set of name/value pairs used to filter /// the items in the list that should be deleted. /// /// /// The complete set of name/value pairs used to filter /// the items in the list that should be deleted. /// ////// The number of items that were affected by the operation. /// protected virtual int ExecuteDelete(IDictionary keys, IDictionary oldValues) { throw new NotSupportedException(); } ////// Performs an insert operation on the specified list. This is only /// supported by a DataControl when CanInsert is true. /// /// /// The set of name/value pairs to be used to initialize /// a new item in the list. /// ////// The number of items that were affected by the operation. /// protected virtual int ExecuteInsert(IDictionary values) { throw new NotSupportedException(); } ////// protected internal abstract IEnumerable ExecuteSelect(DataSourceSelectArguments arguments); ////// Performs an update operation on the specified list. This is only /// supported by a DataControl when CanUpdate is true. /// /// /// The set of name/value pairs used to filter /// the items in the list that should be updated. /// /// /// The set of name/value pairs to be used to update the /// items in the list. /// /// /// The set of name/value pairs to be used to identify the /// item to be updated. /// ////// The number of items that were affected by the operation. /// protected virtual int ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) { throw new NotSupportedException(); } private void OnDataSourceChangedInternal(object sender, EventArgs e) { OnDataSourceViewChanged(e); } protected virtual void OnDataSourceViewChanged(EventArgs e) { EventHandler handler = Events[EventDataSourceViewChanged] as EventHandler; if (handler != null) { handler(this, e); } } public virtual void Insert(IDictionary values, DataSourceViewOperationCallback callback) { if (callback == null) { throw new ArgumentNullException("callback"); } int affectedRecords = 0; bool performedCallback = false; try { affectedRecords = ExecuteInsert(values); } catch (Exception ex) { performedCallback = true; if (!callback(affectedRecords, ex)) { throw; } } finally { if (!performedCallback) { callback(affectedRecords, null); } } } protected internal virtual void RaiseUnsupportedCapabilityError(DataSourceCapabilities capability) { if (!CanPage && ((capability & DataSourceCapabilities.Page) != 0)) { throw new NotSupportedException(SR.GetString(SR.DataSourceView_NoPaging)); } if (!CanSort && ((capability & DataSourceCapabilities.Sort) != 0)) { throw new NotSupportedException(SR.GetString(SR.DataSourceView_NoSorting)); } if (!CanRetrieveTotalRowCount && ((capability & DataSourceCapabilities.RetrieveTotalRowCount) != 0)) { throw new NotSupportedException(SR.GetString(SR.DataSourceView_NoRowCount)); } } public virtual void Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) { if (callback == null) { throw new ArgumentNullException("callback"); } callback(ExecuteSelect(arguments)); } public virtual void Update(IDictionary keys, IDictionary values, IDictionary oldValues, DataSourceViewOperationCallback callback) { if (callback == null) { throw new ArgumentNullException("callback"); } int affectedRecords = 0; bool performedCallback = false; try { affectedRecords = ExecuteUpdate(keys, values, oldValues); } catch (Exception ex) { performedCallback = true; if (!callback(affectedRecords, ex)) { throw; } } finally { if (!performedCallback) { callback(affectedRecords, null); } } } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- Int64AnimationUsingKeyFrames.cs
- HMACMD5.cs
- SqlDataSourceCommandEventArgs.cs
- Resources.Designer.cs
- followingquery.cs
- figurelengthconverter.cs
- WindowsSolidBrush.cs
- Label.cs
- InternalsVisibleToAttribute.cs
- SystemDropShadowChrome.cs
- CodePropertyReferenceExpression.cs
- dataprotectionpermissionattribute.cs
- CallInfo.cs
- GetWinFXPath.cs
- TableStyle.cs
- DefaultObjectMappingItemCollection.cs
- PresentationTraceSources.cs
- MethodResolver.cs
- TreeViewItem.cs
- MimeTypeAttribute.cs
- WebPartEditorApplyVerb.cs
- ALinqExpressionVisitor.cs
- SafeNativeMethods.cs
- FormViewUpdateEventArgs.cs
- ListViewTableRow.cs
- CompositeScriptReferenceEventArgs.cs
- login.cs
- PanelStyle.cs
- ReferencedAssemblyResolver.cs
- PassportIdentity.cs
- StreamGeometryContext.cs
- RectValueSerializer.cs
- PageBreakRecord.cs
- SmiMetaDataProperty.cs
- RootBrowserWindow.cs
- WebControlAdapter.cs
- CheckBoxField.cs
- TdsParserHelperClasses.cs
- DataRecordObjectView.cs
- HtmlContainerControl.cs
- SessionStateContainer.cs
- SafeRightsManagementPubHandle.cs
- autovalidator.cs
- BaseDataBoundControl.cs
- QueryContinueDragEventArgs.cs
- StyleReferenceConverter.cs
- DateTimeOffset.cs
- Regex.cs
- CompoundFileStreamReference.cs
- GroupBoxDesigner.cs
- GenericUriParser.cs
- SmiConnection.cs
- TextEditorMouse.cs
- RepeatInfo.cs
- HtmlEmptyTagControlBuilder.cs
- ScriptReferenceEventArgs.cs
- ObjectDataSourceStatusEventArgs.cs
- DataPager.cs
- ResourceType.cs
- GradientBrush.cs
- ConnectionPoolManager.cs
- _IPv6Address.cs
- ISCIIEncoding.cs
- WebSysDisplayNameAttribute.cs
- DataGridViewCellStyle.cs
- XmlNamespaceMappingCollection.cs
- SignatureConfirmationElement.cs
- ScaleTransform.cs
- EntityClassGenerator.cs
- StatusBar.cs
- XPathQueryGenerator.cs
- DataSourceHelper.cs
- CodeAttributeArgumentCollection.cs
- TTSEngineTypes.cs
- TraceSwitch.cs
- _ConnectOverlappedAsyncResult.cs
- AxHost.cs
- StringToken.cs
- ControlBindingsConverter.cs
- TextTrailingWordEllipsis.cs
- ColumnMapProcessor.cs
- ValueChangedEventManager.cs
- HierarchicalDataBoundControlAdapter.cs
- XPathNavigatorReader.cs
- MatrixIndependentAnimationStorage.cs
- ConfigurationElement.cs
- CustomAttribute.cs
- StatusBarItem.cs
- SchemaTableColumn.cs
- UniqueSet.cs
- CompiledQuery.cs
- HtmlTitle.cs
- DataBoundControlParameterTarget.cs
- AtomMaterializerLog.cs
- WSSecurityJan2004.cs
- ListView.cs
- TypedElement.cs
- DataErrorValidationRule.cs
- TextRangeProviderWrapper.cs
- WebServicesSection.cs