63 lines
2.1 KiB
C#
63 lines
2.1 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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namespace System.Data.Entity
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{
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using System;
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using System.Collections.Generic;
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using System.Data.Entity.Config;
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/// <summary>
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/// A resolver that allows to add dependency resolvers at runtime.
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/// </summary>
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/// <remarks>
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/// This class isn't thread-safe as the tests using it aren't expected to be run in parallel.
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/// </remarks>
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public class MutableResolver : IDbDependencyResolver
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{
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private static readonly Dictionary<Type, Func<object, object>> _resolvers = new Dictionary<Type, Func<object, object>>();
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private static readonly MutableResolver _instance = new MutableResolver();
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private MutableResolver()
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{
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}
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/// <inheritdoc/>
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public object GetService(Type type, object key)
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{
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Func<object, object> resolver;
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if (_resolvers.TryGetValue(type, out resolver))
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{
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return resolver(key);
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}
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return null;
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}
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public static MutableResolver Instance
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{
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get { return _instance; }
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}
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/// <summary>
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/// Adds or replaces a resolver for a dependency of type <typeparamref name="TResolver"/>.
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/// </summary>
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/// <remarks>
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/// Remember to call <see cref="ClearResolvers"/> from a <c>finally</c> block after using this method.
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/// </remarks>
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/// <typeparam name="TResolver">The type of dependency to resolve.</typeparam>
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/// <param name="resolver">A delegate that takes a key object and returns a dependency instance.</param>
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public static void AddResolver<TResolver>(Func<object, object> resolver)
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{
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_resolvers.Add(typeof(TResolver), resolver);
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}
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/// <summary>
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/// Removes all added resolvers.
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/// </summary>
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public static void ClearResolvers()
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{
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_resolvers.Clear();
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}
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}
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}
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