57 lines
1.9 KiB
C#
57 lines
1.9 KiB
C#
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#if !NO_EXPRESSIONS
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace System.Reactive.Linq
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{
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/// <summary>
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/// Provides a set of static methods for writing queries over observable sequences, allowing translation to a target query language.
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/// </summary>
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[LocalQueryMethodImplementationType(typeof(ObservableEx))]
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public static partial class QbservableEx
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{
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internal static Expression GetSourceExpression<TSource>(IObservable<TSource> source)
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{
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var q = source as IQbservable<TSource>;
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if (q != null)
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return q.Expression;
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return Expression.Constant(source, typeof(IObservable<TSource>));
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}
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internal static Expression GetSourceExpression<TSource>(IEnumerable<TSource> source)
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{
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var q = source as IQueryable<TSource>;
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if (q != null)
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return q.Expression;
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return Expression.Constant(source, typeof(IEnumerable<TSource>));
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}
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internal static Expression GetSourceExpression<TSource>(IObservable<TSource>[] sources)
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{
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return Expression.NewArrayInit(
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typeof(IObservable<TSource>),
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sources.Select(source => GetSourceExpression(source))
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);
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}
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internal static Expression GetSourceExpression<TSource>(IEnumerable<TSource>[] sources)
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{
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return Expression.NewArrayInit(
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typeof(IEnumerable<TSource>),
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sources.Select(source => GetSourceExpression(source))
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);
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}
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internal static MethodInfo InfoOf<R>(Expression<Func<R>> f)
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{
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return ((MethodCallExpression)f.Body).Method;
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}
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}
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}
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#endif
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