69 lines
2.5 KiB
C#
69 lines
2.5 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using Microsoft.Framework.Internal;
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namespace Microsoft.AspNet.Mvc.Xml
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{
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/// <summary>
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/// Provides a <see cref="IWrapperProvider"/> for interface types which implement
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/// <see cref="IEnumerable{T}"/>.
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/// </summary>
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public class EnumerableWrapperProvider : IWrapperProvider
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{
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private readonly IWrapperProvider _wrapperProvider;
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private readonly ConstructorInfo _wrappingTypeConstructor;
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/// <summary>
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/// Initializes an instance of <see cref="EnumerableWrapperProvider"/>.
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/// </summary>
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/// <param name="sourceEnumerableOfT">Type of the original <see cref="IEnumerable{T}" />
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/// that is being wrapped.</param>
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/// <param name="elementWrapperProvider">The <see cref="IWrapperProvider"/> for the element type.
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/// Can be null.</param>
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public EnumerableWrapperProvider(
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[NotNull] Type sourceEnumerableOfT,
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IWrapperProvider elementWrapperProvider)
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{
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var enumerableOfT = sourceEnumerableOfT.ExtractGenericInterface(typeof(IEnumerable<>));
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if (!sourceEnumerableOfT.IsInterface() || enumerableOfT == null)
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{
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throw new ArgumentException(
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Resources.FormatEnumerableWrapperProvider_InvalidSourceEnumerableOfT(typeof(IEnumerable<>).Name),
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nameof(sourceEnumerableOfT));
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}
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_wrapperProvider = elementWrapperProvider;
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var declaredElementType = enumerableOfT.GetGenericArguments()[0];
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var wrappedElementType = elementWrapperProvider?.WrappingType ?? declaredElementType;
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WrappingType = typeof(DelegatingEnumerable<,>).MakeGenericType(wrappedElementType, declaredElementType);
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_wrappingTypeConstructor = WrappingType.GetConstructor(new[]
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{
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sourceEnumerableOfT,
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typeof(IWrapperProvider)
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});
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}
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/// <inheritdoc />
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public Type WrappingType
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{
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get;
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}
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/// <inheritdoc />
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public object Wrap(object original)
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{
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if (original == null)
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{
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return null;
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}
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return _wrappingTypeConstructor.Invoke(new object[] { original, _wrapperProvider });
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}
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}
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} |