Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataWebControls / System / Data / WebControls / OrderByBuilder.cs / 1 / OrderByBuilder.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.Objects; using System.Data.Metadata.Edm; using System.Diagnostics; using System.Collections.Specialized; using System.Collections; namespace System.Web.UI.WebControls { internal class OrderByBuilder { private readonly string _argsSortExpression; private readonly EntityDataSourceWrapperCollection _wrapperCollection; private readonly string _orderBy; private readonly bool _autoGenerateOrderByClause; private readonly ParameterCollection _orderByParameters; private readonly EntityDataSource _owner; private readonly bool _generateDefaultOrderByClause; internal OrderByBuilder(string argsSortExpression, EntityDataSourceWrapperCollection wrapperCollection, string orderBy, bool autoGenerateOrderByClause, ParameterCollection orderByParameters, bool generateDefaultOrderByClause, EntityDataSource owner) { _argsSortExpression = argsSortExpression; _wrapperCollection = wrapperCollection; _orderBy = orderBy; _autoGenerateOrderByClause = autoGenerateOrderByClause; _orderByParameters = orderByParameters; _owner = owner; _generateDefaultOrderByClause = generateDefaultOrderByClause; } internal void Generate(TypeUsage tu, out string orderBy, out ObjectParameter[] orderByParameters) { Debug.Assert(null != tu, "Type Usage cannot be null"); GenerateOrderByClause(tu, out orderBy, out orderByParameters); } private void GenerateOrderByClause(TypeUsage tu, out string orderByClause, out ObjectParameter[] orderByObjectParameters) { StringBuilder orderByClauseBuilder = new StringBuilder(); // This sets the orderBy clause based on a clicked column header in the databound control. AppendOrderByKey(orderByClauseBuilder, _argsSortExpression, Strings.EntityDataSourceView_ColumnHeader, tu); // AutoGenerateOrderByClause is mutually exclusive with OrderBy. // Only one of the following two if statements will execute. if (_autoGenerateOrderByClause) { Debug.Assert(String.IsNullOrEmpty(_orderBy), "If AutoGenerateOrderByClause is true, then OrderBy cannot be set. This should have been caught by a runtime error check"); IOrderedDictionary paramValues = _orderByParameters.GetValues(_owner.HttpContext, _owner); foreach (DictionaryEntry de in paramValues) { // Skip AutoGenerateOrderBy on expressions that have a null value. if (!string.IsNullOrEmpty((string)(de.Value))) { if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } AppendOrderByKey(orderByClauseBuilder, (string)(de.Value), Strings.EntityDataSourceView_AutoGenerateOrderByParameters, tu); } } } // Append the OrderBy expression, if it's nonzero length. // if (!String.IsNullOrEmpty(_orderBy)) { orderByObjectParameters = _owner.GetOrderByParameters(); Debug.Assert(!_autoGenerateOrderByClause, "If OrderBy is set, AutoGenerateOrderBy must be false. This should have been caught by a runtime error check"); if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } orderByClauseBuilder.Append(_orderBy); } else { orderByObjectParameters = new ObjectParameter[] { }; } if (orderByClauseBuilder.Length==0 && _generateDefaultOrderByClause) { // This only occurs if there's no EntitySet, which means entities are not wrapped. orderByClauseBuilder.Append(GenerateDefaultOrderByFromTypeUsage(tu)); } orderByClause = orderByClauseBuilder.ToString(); } private void AppendOrderByKey(StringBuilder orderByClauseBuilder, string expression, string errorText, TypeUsage tu) { if (!String.IsNullOrEmpty(expression)) { const string ascTail = " ASC"; const string descTail = " DESC"; string tail = String.Empty; string columnName = expression; if (expression.EndsWith(ascTail, StringComparison.OrdinalIgnoreCase)) { tail = ascTail; columnName = expression.Substring(0, expression.Length - 4); } else if (expression.EndsWith(descTail, StringComparison.OrdinalIgnoreCase)) { tail = descTail; columnName = expression.Substring(0, expression.Length - 5); } if (EntityDataSourceUtil.PropertyIsOnEntity(columnName, _wrapperCollection, null, tu)) { orderByClauseBuilder.Append(EntityDataSourceUtil.GetEntitySqlValueForColumnName(columnName, _wrapperCollection)); orderByClauseBuilder.Append(tail); } else // pass the sort expression through verbatim. { orderByClauseBuilder.Append(expression); } } } private static string GenerateDefaultOrderByFromTypeUsage(TypeUsage tu) { StringBuilder orderByBuilder = new StringBuilder(); ReadOnlyMetadataCollectionpropertyCollection; List keyMemberNames = null; EntityType entityType = tu.EdmType as EntityType; if (null != entityType) { ReadOnlyMetadataCollection keyMembers; keyMembers = entityType.KeyMembers; keyMemberNames = new List (entityType.KeyMembers.Count); propertyCollection = entityType.Properties; foreach (EdmMember edmMember in keyMembers) { keyMemberNames.Add(edmMember.Name); } } else { return String.Empty; } foreach (EdmProperty property in propertyCollection) { if (keyMemberNames.Contains(property.Name) && property.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType) { if (0 < orderByBuilder.Length) { orderByBuilder.Append(", "); } orderByBuilder.Append(EntityDataSourceUtil.EntitySqlElementAlias); orderByBuilder.Append("."); orderByBuilder.Append(EntityDataSourceUtil.QuoteEntitySqlIdentifier(property.Name)); } } return orderByBuilder.ToString(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.Objects; using System.Data.Metadata.Edm; using System.Diagnostics; using System.Collections.Specialized; using System.Collections; namespace System.Web.UI.WebControls { internal class OrderByBuilder { private readonly string _argsSortExpression; private readonly EntityDataSourceWrapperCollection _wrapperCollection; private readonly string _orderBy; private readonly bool _autoGenerateOrderByClause; private readonly ParameterCollection _orderByParameters; private readonly EntityDataSource _owner; private readonly bool _generateDefaultOrderByClause; internal OrderByBuilder(string argsSortExpression, EntityDataSourceWrapperCollection wrapperCollection, string orderBy, bool autoGenerateOrderByClause, ParameterCollection orderByParameters, bool generateDefaultOrderByClause, EntityDataSource owner) { _argsSortExpression = argsSortExpression; _wrapperCollection = wrapperCollection; _orderBy = orderBy; _autoGenerateOrderByClause = autoGenerateOrderByClause; _orderByParameters = orderByParameters; _owner = owner; _generateDefaultOrderByClause = generateDefaultOrderByClause; } internal void Generate(TypeUsage tu, out string orderBy, out ObjectParameter[] orderByParameters) { Debug.Assert(null != tu, "Type Usage cannot be null"); GenerateOrderByClause(tu, out orderBy, out orderByParameters); } private void GenerateOrderByClause(TypeUsage tu, out string orderByClause, out ObjectParameter[] orderByObjectParameters) { StringBuilder orderByClauseBuilder = new StringBuilder(); // This sets the orderBy clause based on a clicked column header in the databound control. AppendOrderByKey(orderByClauseBuilder, _argsSortExpression, Strings.EntityDataSourceView_ColumnHeader, tu); // AutoGenerateOrderByClause is mutually exclusive with OrderBy. // Only one of the following two if statements will execute. if (_autoGenerateOrderByClause) { Debug.Assert(String.IsNullOrEmpty(_orderBy), "If AutoGenerateOrderByClause is true, then OrderBy cannot be set. This should have been caught by a runtime error check"); IOrderedDictionary paramValues = _orderByParameters.GetValues(_owner.HttpContext, _owner); foreach (DictionaryEntry de in paramValues) { // Skip AutoGenerateOrderBy on expressions that have a null value. if (!string.IsNullOrEmpty((string)(de.Value))) { if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } AppendOrderByKey(orderByClauseBuilder, (string)(de.Value), Strings.EntityDataSourceView_AutoGenerateOrderByParameters, tu); } } } // Append the OrderBy expression, if it's nonzero length. // if (!String.IsNullOrEmpty(_orderBy)) { orderByObjectParameters = _owner.GetOrderByParameters(); Debug.Assert(!_autoGenerateOrderByClause, "If OrderBy is set, AutoGenerateOrderBy must be false. This should have been caught by a runtime error check"); if (0 < orderByClauseBuilder.Length) { orderByClauseBuilder.Append(", "); } orderByClauseBuilder.Append(_orderBy); } else { orderByObjectParameters = new ObjectParameter[] { }; } if (orderByClauseBuilder.Length==0 && _generateDefaultOrderByClause) { // This only occurs if there's no EntitySet, which means entities are not wrapped. orderByClauseBuilder.Append(GenerateDefaultOrderByFromTypeUsage(tu)); } orderByClause = orderByClauseBuilder.ToString(); } private void AppendOrderByKey(StringBuilder orderByClauseBuilder, string expression, string errorText, TypeUsage tu) { if (!String.IsNullOrEmpty(expression)) { const string ascTail = " ASC"; const string descTail = " DESC"; string tail = String.Empty; string columnName = expression; if (expression.EndsWith(ascTail, StringComparison.OrdinalIgnoreCase)) { tail = ascTail; columnName = expression.Substring(0, expression.Length - 4); } else if (expression.EndsWith(descTail, StringComparison.OrdinalIgnoreCase)) { tail = descTail; columnName = expression.Substring(0, expression.Length - 5); } if (EntityDataSourceUtil.PropertyIsOnEntity(columnName, _wrapperCollection, null, tu)) { orderByClauseBuilder.Append(EntityDataSourceUtil.GetEntitySqlValueForColumnName(columnName, _wrapperCollection)); orderByClauseBuilder.Append(tail); } else // pass the sort expression through verbatim. { orderByClauseBuilder.Append(expression); } } } private static string GenerateDefaultOrderByFromTypeUsage(TypeUsage tu) { StringBuilder orderByBuilder = new StringBuilder(); ReadOnlyMetadataCollection propertyCollection; List keyMemberNames = null; EntityType entityType = tu.EdmType as EntityType; if (null != entityType) { ReadOnlyMetadataCollection keyMembers; keyMembers = entityType.KeyMembers; keyMemberNames = new List (entityType.KeyMembers.Count); propertyCollection = entityType.Properties; foreach (EdmMember edmMember in keyMembers) { keyMemberNames.Add(edmMember.Name); } } else { return String.Empty; } foreach (EdmProperty property in propertyCollection) { if (keyMemberNames.Contains(property.Name) && property.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType) { if (0 < orderByBuilder.Length) { orderByBuilder.Append(", "); } orderByBuilder.Append(EntityDataSourceUtil.EntitySqlElementAlias); orderByBuilder.Append("."); orderByBuilder.Append(EntityDataSourceUtil.QuoteEntitySqlIdentifier(property.Name)); } } return orderByBuilder.ToString(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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