83 lines
2.9 KiB
C#
83 lines
2.9 KiB
C#
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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Dynamic;
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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.Web.Helpers.Test
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{
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/// <summary>
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/// Dynamic object implementation over a regualar CLR object. Getmember accesses members through reflection.
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/// </summary>
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public class DynamicWrapper : IDynamicMetaObjectProvider
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{
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private object _object;
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public DynamicWrapper(object obj)
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{
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_object = obj;
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}
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public DynamicMetaObject GetMetaObject(Expression parameter)
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{
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return new DynamicWrapperMetaObject(parameter, this);
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}
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private class DynamicWrapperMetaObject : DynamicMetaObject
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{
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public DynamicWrapperMetaObject(Expression expression, object value)
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: base(expression, BindingRestrictions.Empty, value)
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{
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}
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private object WrappedObject
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{
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get { return ((DynamicWrapper)Value)._object; }
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}
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private Expression GetDynamicExpression()
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{
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return Expression.Convert(Expression, typeof(DynamicWrapper));
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}
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private Expression GetWrappedObjectExpression()
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{
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FieldInfo fieldInfo = typeof(DynamicWrapper).GetField("_object", BindingFlags.NonPublic | BindingFlags.Instance);
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Debug.Assert(fieldInfo != null);
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return Expression.Convert(
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Expression.Field(GetDynamicExpression(), fieldInfo),
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WrappedObject.GetType());
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}
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private Expression GetMemberAccessExpression(string memberName)
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{
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return Expression.Property(
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GetWrappedObjectExpression(),
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memberName);
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}
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public override DynamicMetaObject BindGetMember(GetMemberBinder binder)
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{
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var binderDefault = binder.FallbackGetMember(this);
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var expression = Expression.Convert(GetMemberAccessExpression(binder.Name), typeof(object));
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var dynamicSuggestion = new DynamicMetaObject(expression, BindingRestrictions.GetTypeRestriction(Expression, LimitType)
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.Merge(binderDefault.Restrictions));
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return binder.FallbackGetMember(this, dynamicSuggestion);
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}
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public override IEnumerable<string> GetDynamicMemberNames()
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{
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return (from p in WrappedObject.GetType().GetProperties()
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orderby p.Name
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select p.Name).ToArray();
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}
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}
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}
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}
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