62 lines
2.1 KiB
C#
62 lines
2.1 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT License.
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// See the LICENSE file in the project root for more information.
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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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#pragma warning disable CA1711 // (Don't use Ex suffix.) This has been a public type for many years, so we can't rename it now.
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public static partial class QbservableEx
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#pragma warning restore CA1711
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{
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internal static Expression GetSourceExpression<TSource>(IObservable<TSource> source)
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{
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if (source is IQbservable<TSource> q)
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{
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return q.Expression;
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}
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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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if (source is IQueryable<TSource> q)
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{
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return q.Expression;
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}
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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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