Newtonsoft.Json/Utilities/LinqBridge.cs

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#if NET20

#region License, Terms and Author(s)
//
// LINQBridge
// Copyright (c) 2007-9 Atif Aziz, Joseph Albahari. All rights reserved.
//
//  Author(s):
//
//      Atif Aziz, http://www.raboof.com
//
// This library is free software; you can redistribute it and/or modify it 
// under the terms of the New BSD License, a copy of which should have 
// been delivered along with this distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#endregion

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using Newtonsoft.Json.Serialization;

namespace Newtonsoft.Json.Utilities.LinqBridge
{
  /// <summary>
  /// Provides a set of static (Shared in Visual Basic) methods for 
  /// querying objects that implement <see cref="IEnumerable{T}" />.
  /// </summary>
  internal static partial class Enumerable
  {
    /// <summary>
    /// Returns the input typed as <see cref="IEnumerable{T}"/>.
    /// </summary>

    public static IEnumerable<TSource> AsEnumerable<TSource>(IEnumerable<TSource> source)
    {
      return source;
    }

    /// <summary>
    /// Returns an empty <see cref="IEnumerable{T}"/> that has the 
    /// specified type argument.
    /// </summary>

    public static IEnumerable<TResult> Empty<TResult>()