ClassLibraryWeiBao/json引擎2/Utilities/ExpressionReflectionDelegateFactory.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

#if !(PORTABLE40 || NET20 || NET35)
using System;
using System.Linq.Expressions;
using System.Reflection;

namespace Newtonsoft.Json.Utilities
{
  internal class ExpressionReflectionDelegateFactory : ReflectionDelegateFactory
  {
    private static readonly ExpressionReflectionDelegateFactory _instance = new ExpressionReflectionDelegateFactory();

    internal static ReflectionDelegateFactory Instance
    {
      get { return _instance; }
    }

    public override MethodCall<T, object> CreateMethodCall<T>(MethodBase method)
    {
      ValidationUtils.ArgumentNotNull(method, "method");

      Type type = typeof(object);

      ParameterExpression targetParameterExpression = Expression.Parameter(type, "target");
      ParameterExpression argsParameterExpression = Expression.Parameter(typeof(object[]), "args");

      ParameterInfo[] parametersInfo = method.GetParameters();

      Expression[] argsExpression = new Expression[parametersInfo.Length];

      for (int i = 0; i < parametersInfo.Length; i++)
      {
        Expression indexExpression = Expression.Constant(i);

        Expression paramAccessorExpression = Expression.ArrayIndex(argsParameterExpression, indexExpression);