Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / DynamicControlParameter.cs / 1305376 / DynamicControlParameter.cs
using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.Web.DynamicData.Util; using System.Web.Resources; using System.Web.UI; using System.Web.UI.WebControls; namespace System.Web.DynamicData { ////// DynamicControlParameter is similar to ControlParameter, but understainds higher level concepts. e.g. in a /// master-details scenario using a GridView and DetailsView, you only need to point the DetailsView's datasource /// to the GridView (using a DynamicControlParameter), and it does the right thing. This works even for /// multi-part primary keys /// public class DynamicControlParameter : Parameter, IWhereParametersProvider { ////// public DynamicControlParameter() { } ////// public DynamicControlParameter(string controlId) { ControlId = controlId; } ////// The ID of the control from which the parameter gets its data /// public string ControlId { get; set; } ////// See IWhereParametersProvider.GetWhereParameters /// public virtual IEnumerableGetWhereParameters(IDynamicDataSource dataSource) { Debug.Assert(dataSource != null); // Find the control that the ControlParameter uses Control control = Misc.FindControl((Control)dataSource, ControlId); if (control == null) { throw new InvalidOperationException(String.Format( CultureInfo.CurrentCulture, DynamicDataResources.DynamicControlParameter_DynamicDataSourceControlNotFound, ControlId)); } // If the control is itself a parameter provider, delegate to it var whereParametersProvider = control as IWhereParametersProvider; if (whereParametersProvider != null) { return whereParametersProvider.GetWhereParameters(dataSource); } IControlParameterTarget paramTarget = DynamicDataManager.GetControlParameterTarget(control); if (paramTarget == null) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, DynamicDataResources.DynamicControlParameter_DynamicDataSourceControlCannotBeUsedAsParent, ControlId)); } string columnName = Name; MetaColumn column = null; MetaTable table = MetaTableHelper.GetTableWithFullFallback(dataSource, HttpContext.Current.ToWrapper()); if (!String.IsNullOrEmpty(columnName)) { column = table.GetColumn(columnName); } else { // There was no Name attribute telling us what field to filter, but maybe // the control given us data has that info column = paramTarget.FilteredColumn; } if (column == null) { // If there is no specific column, we're setting the primary key if (paramTarget.Table != table) { throw new Exception(String.Format(CultureInfo.CurrentCulture, DynamicDataResources.DynamicControlParameter_InvalidPK, ControlId, paramTarget.Table, table.Name)); } return GetPrimaryKeyControlWhereParameters(control, paramTarget); } else if (column is MetaForeignKeyColumn) { return GetForeignKeyControlWhereParameters(control, paramTarget, (MetaForeignKeyColumn)column); } return GetPropertyControlWhereParameters(control, paramTarget, column); } private IEnumerable GetPropertyControlWhereParameters(Control control, IControlParameterTarget paramTarget, MetaColumn column) { ControlParameter controlParameter = new ControlParameter() { Name = column.Name, ControlID = control.UniqueID, PropertyName = paramTarget.GetPropertyNameExpression(column.Name) }; DataSourceUtil.SetParameterTypeCodeAndDbType(controlParameter, column); yield return controlParameter; } private IEnumerable GetPrimaryKeyControlWhereParameters(Control control, IControlParameterTarget paramTarget) { MetaTable parentTable = paramTarget.Table; if (parentTable != null) { // For each PK column in the table, we need to create a ControlParameter foreach (var keyColumn in parentTable.PrimaryKeyColumns) { var controlParameter = new ControlParameter() { Name = keyColumn.Name, ControlID = control.UniqueID, PropertyName = paramTarget.GetPropertyNameExpression(keyColumn.Name) }; DataSourceUtil.SetParameterTypeCodeAndDbType(controlParameter, keyColumn); yield return controlParameter; } } } private IEnumerable GetForeignKeyControlWhereParameters(Control control, IControlParameterTarget paramTarget, MetaForeignKeyColumn column) { MetaTable parentTable = paramTarget.Table; if (parentTable != null) { string namePrefix = String.Empty; // Make sure the data types match if (column.ColumnType != parentTable.EntityType) { throw new Exception(String.Format(CultureInfo.CurrentCulture, DynamicDataResources.DynamicControlParameter_DynamicDataSourceColumnNotCompatibleWithTable, column.DisplayName, parentTable.Name)); } // For each underlying FK, we need to create a ControlParameter Debug.Assert(column.ForeignKeyNames.Count == parentTable.PrimaryKeyColumns.Count); int index = 0; foreach (var fkName in column.ForeignKeyNames) { MetaColumn parentTablePKColumn = parentTable.PrimaryKeyColumns[index++]; var controlParameter = new ControlParameter() { Name = fkName, ControlID = control.UniqueID, PropertyName = paramTarget.GetPropertyNameExpression(parentTablePKColumn.Name) }; DataSourceUtil.SetParameterTypeCodeAndDbType(controlParameter, parentTablePKColumn); yield return controlParameter; } } } /// /// same as base /// /// /// ///protected override object Evaluate(HttpContext context, Control control) { // If this gets called, it means we never had a chance to expand the parameter. Give an error // telling the user to use a DynamicDataManager throw new InvalidOperationException(String.Format( CultureInfo.CurrentCulture, DynamicDataResources.DynamicParameter_NeedExpansion, typeof(DynamicControlParameter).Name)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- TextBreakpoint.cs
- XmlWellformedWriterHelpers.cs
- NativeMethods.cs
- OptimisticConcurrencyException.cs
- IndexerNameAttribute.cs
- URI.cs
- CompressionTracing.cs
- InProcStateClientManager.cs
- IteratorDescriptor.cs
- _SpnDictionary.cs
- SqlDataSource.cs
- HtmlWindow.cs
- DataServiceQueryException.cs
- DataGridViewRow.cs
- ResponseStream.cs
- CompatibleIComparer.cs
- AspNetSynchronizationContext.cs
- RuntimeCompatibilityAttribute.cs
- ObjectListField.cs
- SwitchLevelAttribute.cs
- ListMarkerSourceInfo.cs
- DesignerSerializerAttribute.cs
- PageCatalogPart.cs
- EdmFunctionAttribute.cs
- InvokeProviderWrapper.cs
- TagNameToTypeMapper.cs
- BitmapMetadata.cs
- BroadcastEventHelper.cs
- WinEventWrap.cs
- ImageMetadata.cs
- ProcessHost.cs
- Send.cs
- FixedNode.cs
- NativeMethods.cs
- RoutedCommand.cs
- Converter.cs
- TimersDescriptionAttribute.cs
- DesignerActionGlyph.cs
- MenuScrollingVisibilityConverter.cs
- Lease.cs
- SymbolPair.cs
- HtmlMeta.cs
- XmlTextEncoder.cs
- RowsCopiedEventArgs.cs
- Bezier.cs
- HTMLTextWriter.cs
- Base64Decoder.cs
- EntityContainer.cs
- ResetableIterator.cs
- Domain.cs
- FontUnit.cs
- ErrorFormatter.cs
- WebServiceParameterData.cs
- HttpModulesSection.cs
- FormViewInsertedEventArgs.cs
- NavigationCommands.cs
- ClassicBorderDecorator.cs
- Attribute.cs
- PartitionResolver.cs
- DuplexChannel.cs
- AutomationElementIdentifiers.cs
- Roles.cs
- RuntimeIdentifierPropertyAttribute.cs
- TdsParser.cs
- ProfileServiceManager.cs
- PreservationFileReader.cs
- SecurityElement.cs
- BaseCodeDomTreeGenerator.cs
- TextTreeTextBlock.cs
- SqlFunctionAttribute.cs
- VariableAction.cs
- HwndAppCommandInputProvider.cs
- DependencyStoreSurrogate.cs
- MemoryMappedViewStream.cs
- OrderedHashRepartitionEnumerator.cs
- DashStyle.cs
- CachedPathData.cs
- RangeValueProviderWrapper.cs
- TableSectionStyle.cs
- UnionExpr.cs
- WorkflowMarkupSerializer.cs
- CodeArrayIndexerExpression.cs
- RoleManagerSection.cs
- NetworkInformationException.cs
- WebServiceEndpoint.cs
- StaticSiteMapProvider.cs
- IResourceProvider.cs
- NamespaceExpr.cs
- DateTimeConstantAttribute.cs
- FreezableCollection.cs
- AddInProcess.cs
- DataRowComparer.cs
- PageCatalogPart.cs
- DownloadProgressEventArgs.cs
- ResourcesGenerator.cs
- NetCodeGroup.cs
- FloaterParagraph.cs
- ScopedMessagePartSpecification.cs
- WsdlWriter.cs
- CopyAttributesAction.cs