EmptyEnumerable.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Framework / MS / Internal / Controls / EmptyEnumerable.cs / 1 / EmptyEnumerable.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Empty enumerable 
//
// History: 
//  11/11/2004  KenLai  :   Created
//
//---------------------------------------------------------------------------
using System; 
using System.Collections;
 
namespace MS.Internal.Controls 
{
    ///  
    /// Returns an Enumerable that is empty.
    /// 
    internal class EmptyEnumerable: IEnumerable
    { 
        // singleton class, private ctor
        private EmptyEnumerable() 
        { 
        }
 
        IEnumerator IEnumerable.GetEnumerator()
        {
            return EmptyEnumerator.Instance;
        } 

        ///  
        /// Read-Only instance of an Empty Enumerable. 
        /// 
        public static IEnumerable Instance 
        {
            get
            {
                if (_instance == null) 
                {
                    _instance = new EmptyEnumerable(); 
                } 
                return _instance;
            } 
        }

        private static IEnumerable _instance;
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Empty enumerable 
//
// History: 
//  11/11/2004  KenLai  :   Created
//
//---------------------------------------------------------------------------
using System; 
using System.Collections;
 
namespace MS.Internal.Controls 
{
    ///  
    /// Returns an Enumerable that is empty.
    /// 
    internal class EmptyEnumerable: IEnumerable
    { 
        // singleton class, private ctor
        private EmptyEnumerable() 
        { 
        }
 
        IEnumerator IEnumerable.GetEnumerator()
        {
            return EmptyEnumerator.Instance;
        } 

        ///  
        /// Read-Only instance of an Empty Enumerable. 
        /// 
        public static IEnumerable Instance 
        {
            get
            {
                if (_instance == null) 
                {
                    _instance = new EmptyEnumerable(); 
                } 
                return _instance;
            } 
        }

        private static IEnumerable _instance;
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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