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/ 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.
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