ClassLibraryWeiBao/json引擎2/Linq/JPropertyDescriptor.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 !(SILVERLIGHT || NETFX_CORE || PORTABLE || PORTABLE40)
using System;
using System.ComponentModel;
using Newtonsoft.Json.Utilities;

namespace Newtonsoft.Json.Linq
{
  /// <summary>
  /// Represents a view of a <see cref="JProperty"/>.
  /// </summary>
  public class JPropertyDescriptor : PropertyDescriptor
  {
    private readonly Type _propertyType;

    /// <summary>
    /// Initializes a new instance of the <see cref="JPropertyDescriptor"/> class.
    /// </summary>
    /// <param name="name">The name.</param>
    /// <param name="propertyType">Type of the property.</param>
    public JPropertyDescriptor(string name, Type propertyType)
      : base(name, null)
    {
      ValidationUtils.ArgumentNotNull(name, "name");
      ValidationUtils.ArgumentNotNull(propertyType, "propertyType");

      _propertyType = propertyType;
    }

    private static JObject CastInstance(object instance)
    {
      return (JObject)instance;
    }

    /// <summary>
    /// When overridden in a derived class, returns whether resetting an object changes its value.