Code:
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using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Linq.Expressions; using System.Linq; using System.Reflection; using System.Diagnostics; namespace System.Data.Linq { using System.Data.Linq.Mapping; using System.Data.Linq.Provider; internal sealed class DataQuery: IOrderedQueryable , IQueryProvider, IEnumerable , IOrderedQueryable, IEnumerable, IListSource { DataContext context; Expression queryExpression; private IBindingList cachedList; public DataQuery(DataContext context, Expression expression) { this.context = context; this.queryExpression = expression; } Expression IQueryable.Expression { get { return this.queryExpression; } } Type IQueryable.ElementType { get { return typeof(T); } } IQueryable IQueryProvider.CreateQuery(Expression expression) { if (expression == null) throw Error.ArgumentNull("expression"); Type eType = System.Data.Linq.SqlClient.TypeSystem.GetElementType(expression.Type); Type qType = typeof(IQueryable<>).MakeGenericType(eType); if (!qType.IsAssignableFrom(expression.Type)) throw Error.ExpectedQueryableArgument("expression", qType); Type dqType = typeof(DataQuery<>).MakeGenericType(eType); return (IQueryable)Activator.CreateInstance(dqType, new object[] { this.context, expression }); } IQueryable IQueryProvider.CreateQuery(Expression expression) { if (expression == null) throw Error.ArgumentNull("expression"); if (!typeof(IQueryable).IsAssignableFrom(expression.Type)) throw Error.ExpectedQueryableArgument("expression", typeof(IEnumerable)); return new DataQuery(this.context, expression); } object IQueryProvider.Execute(Expression expression) { return this.context.Provider.Execute(expression).ReturnValue; } S IQueryProvider.Execute(Expression expression) { return (S)this.context.Provider.Execute(expression).ReturnValue; } IQueryProvider IQueryable.Provider { get{ return (IQueryProvider)this; } } IEnumerator IEnumerable.GetEnumerator() { return ((IEnumerable)this.context.Provider.Execute(this.queryExpression).ReturnValue).GetEnumerator(); } IEnumeratorIEnumerable .GetEnumerator() { return ((IEnumerable )this.context.Provider.Execute(this.queryExpression).ReturnValue).GetEnumerator(); } bool IListSource.ContainsListCollection { get { return false; } } IList IListSource.GetList() { if (cachedList == null) { cachedList = GetNewBindingList(); } return cachedList; } internal IBindingList GetNewBindingList() { return BindingList.Create (this.context, this); } public override string ToString() { return this.context.Provider.GetQueryText(this.queryExpression); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Linq.Expressions; using System.Linq; using System.Reflection; using System.Diagnostics; namespace System.Data.Linq { using System.Data.Linq.Mapping; using System.Data.Linq.Provider; internal sealed class DataQuery : IOrderedQueryable , IQueryProvider, IEnumerable , IOrderedQueryable, IEnumerable, IListSource { DataContext context; Expression queryExpression; private IBindingList cachedList; public DataQuery(DataContext context, Expression expression) { this.context = context; this.queryExpression = expression; } Expression IQueryable.Expression { get { return this.queryExpression; } } Type IQueryable.ElementType { get { return typeof(T); } } IQueryable IQueryProvider.CreateQuery(Expression expression) { if (expression == null) throw Error.ArgumentNull("expression"); Type eType = System.Data.Linq.SqlClient.TypeSystem.GetElementType(expression.Type); Type qType = typeof(IQueryable<>).MakeGenericType(eType); if (!qType.IsAssignableFrom(expression.Type)) throw Error.ExpectedQueryableArgument("expression", qType); Type dqType = typeof(DataQuery<>).MakeGenericType(eType); return (IQueryable)Activator.CreateInstance(dqType, new object[] { this.context, expression }); } IQueryable IQueryProvider.CreateQuery(Expression expression) { if (expression == null) throw Error.ArgumentNull("expression"); if (!typeof(IQueryable).IsAssignableFrom(expression.Type)) throw Error.ExpectedQueryableArgument("expression", typeof(IEnumerable)); return new DataQuery(this.context, expression); } object IQueryProvider.Execute(Expression expression) { return this.context.Provider.Execute(expression).ReturnValue; } S IQueryProvider.Execute(Expression expression) { return (S)this.context.Provider.Execute(expression).ReturnValue; } IQueryProvider IQueryable.Provider { get{ return (IQueryProvider)this; } } IEnumerator IEnumerable.GetEnumerator() { return ((IEnumerable)this.context.Provider.Execute(this.queryExpression).ReturnValue).GetEnumerator(); } IEnumeratorIEnumerable .GetEnumerator() { return ((IEnumerable )this.context.Provider.Execute(this.queryExpression).ReturnValue).GetEnumerator(); } bool IListSource.ContainsListCollection { get { return false; } } IList IListSource.GetList() { if (cachedList == null) { cachedList = GetNewBindingList(); } return cachedList; } internal IBindingList GetNewBindingList() { return BindingList.Create (this.context, this); } public override string ToString() { return this.context.Provider.GetQueryText(this.queryExpression); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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