94 lines
3.3 KiB
C#
94 lines
3.3 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq.Expressions;
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using System.Linq;
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using System.Reflection;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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namespace System.Data.Linq {
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using System.Data.Linq.Mapping;
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using System.Data.Linq.Provider;
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internal sealed class DataQuery<T> : IOrderedQueryable<T>, IQueryProvider, IEnumerable<T>, IOrderedQueryable, IEnumerable, IListSource {
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DataContext context;
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Expression queryExpression;
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private IBindingList cachedList;
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public DataQuery(DataContext context, Expression expression) {
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this.context = context;
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this.queryExpression = expression;
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}
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Expression IQueryable.Expression {
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get { return this.queryExpression; }
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}
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Type IQueryable.ElementType {
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get { return typeof(T); }
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}
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[MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.NoOptimization)]
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IQueryable IQueryProvider.CreateQuery(Expression expression) {
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if (expression == null)
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throw Error.ArgumentNull("expression");
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Type eType = System.Data.Linq.SqlClient.TypeSystem.GetElementType(expression.Type);
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Type qType = typeof(IQueryable<>).MakeGenericType(eType);
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if (!qType.IsAssignableFrom(expression.Type))
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throw Error.ExpectedQueryableArgument("expression", qType);
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Type dqType = typeof(DataQuery<>).MakeGenericType(eType);
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return (IQueryable)Activator.CreateInstance(dqType, new object[] { this.context, expression });
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}
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IQueryable<S> IQueryProvider.CreateQuery<S>(Expression expression) {
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if (expression == null)
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throw Error.ArgumentNull("expression");
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if (!typeof(IQueryable<S>).IsAssignableFrom(expression.Type))
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throw Error.ExpectedQueryableArgument("expression", typeof(IEnumerable<S>));
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return new DataQuery<S>(this.context, expression);
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}
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object IQueryProvider.Execute(Expression expression) {
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return this.context.Provider.Execute(expression).ReturnValue;
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}
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S IQueryProvider.Execute<S>(Expression expression) {
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return (S)this.context.Provider.Execute(expression).ReturnValue;
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}
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IQueryProvider IQueryable.Provider {
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get{
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return (IQueryProvider)this;
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}
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}
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IEnumerator IEnumerable.GetEnumerator() {
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return ((IEnumerable)this.context.Provider.Execute(this.queryExpression).ReturnValue).GetEnumerator();
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}
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IEnumerator<T> IEnumerable<T>.GetEnumerator() {
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return ((IEnumerable<T>)this.context.Provider.Execute(this.queryExpression).ReturnValue).GetEnumerator();
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}
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bool IListSource.ContainsListCollection {
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get { return false; }
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}
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IList IListSource.GetList() {
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if (cachedList == null) {
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cachedList = GetNewBindingList();
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}
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return cachedList;
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}
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internal IBindingList GetNewBindingList() {
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return BindingList.Create<T>(this.context, this);
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}
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public override string ToString() {
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return this.context.Provider.GetQueryText(this.queryExpression);
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}
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}
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}
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