TypeExtensionConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Markup / TypeExtensionConverter.cs / 1 / TypeExtensionConverter.cs
                        

                        
                            //------------------------------------------------------------------------ 
//
//  Microsoft Windows Client Platform
//  Copyright (C) Microsoft Corporation, 2005
// 
//  File:      TypeExtensionConverter.cs
// 
//  Contents:  Converter to convert TypeExtensions to InstanceDescriptors 

//  Created:   04/28/2005 chuckj 
//
//-----------------------------------------------------------------------

using System; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Collections.Generic; 
using System.Text;
using System.Security; 

namespace System.Windows.Markup
{
    class TypeExtensionConverter : TypeConverter 
    {
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) 
        { 
            if (destinationType == typeof(InstanceDescriptor))
            { 
                return true;
            }
            return base.CanConvertTo(context, destinationType);
        } 

        /// 
        ///     Critical: calls InstanceDescriptor ctor which LinkDemands 
        ///     TreatAsSafe: can only make an InstanceDescriptor for TypeExtension, not an arbitrary class
        /// 
        [SecurityCritical, SecurityTreatAsSafe]
        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType == typeof(InstanceDescriptor)) 
            {
                TypeExtension typeExtension = value as TypeExtension; 
                if (typeExtension == null) 
                {
                    throw new ArgumentException(SR.Get(SRID.MustBeOfType, "value", "TypeExtension")); 
                }
                return new InstanceDescriptor(typeof(TypeExtension).GetConstructor(new Type[] { typeof(Type) }),
                                              new object[] { typeExtension.Type });
            } 
            return base.ConvertTo(context, culture, value, destinationType);
        } 
    } 
}

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

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