ExpressionVisitorHelpers.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / ELinq / ExpressionVisitorHelpers.cs / 1305376 / ExpressionVisitorHelpers.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
//--------------------------------------------------------------------- 
using System; 
using System.Collections.Generic;
using System.Collections.ObjectModel; 
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Data; 

 
namespace System.Linq.Expressions 
{
    // Because we are using the source file for ExpressionVistor from System.Core 
    // we need to add code to facilitate some external calls that ExpressionVisitor makes.
    // The classes in this file do that.

    internal static class Error 
    {
        internal static Exception UnhandledExpressionType(ExpressionType expressionType) 
        { 
            return EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_UnhandledExpressionType(expressionType));
        } 

        internal static Exception UnhandledBindingType(MemberBindingType memberBindingType)
        {
            return EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_UnhandledBindingType(memberBindingType)); 
        }
    } 
 
    internal static class ReadOnlyCollectionExtensions
    { 
        internal static ReadOnlyCollection ToReadOnlyCollection(this IEnumerable sequence)
        {
            if (sequence == null)
                return DefaultReadOnlyCollection.Empty; 
            ReadOnlyCollection col = sequence as ReadOnlyCollection;
            if (col != null) 
                return col; 
            return new ReadOnlyCollection(sequence.ToArray());
        } 
        private static class DefaultReadOnlyCollection
        {
            private static ReadOnlyCollection _defaultCollection;
            internal static ReadOnlyCollection Empty 
            {
                get 
                { 
                    if (_defaultCollection == null)
                        _defaultCollection = new ReadOnlyCollection(new T[] { }); 
                    return _defaultCollection;
                }
            }
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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