DeferrableContentConverter.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 / wpf / src / Framework / System / Windows / DeferrableContentConverter.cs / 1305600 / DeferrableContentConverter.cs
                        

                        
                            using System; 
using System.IO;
using System.Net;
using System.Collections;
using System.Collections.Generic; 
using System.Collections.ObjectModel;
using System.Collections.Specialized; 
using System.Diagnostics; 
using System.ComponentModel;
using System.Windows.Threading; 
using System.Windows.Media;
using System.IO.Packaging;
using MS.Internal.IO.Packaging;         // for PackageCacheEntry
using System.Globalization; 
using System.Windows.Navigation;
 
using MS.Internal; 
using MS.Internal.Utility;
using MS.Internal.AppModel; 
using MS.Utility;
using System.Xaml;
using System.Windows.Baml2006;
using System.Windows.Markup; 

namespace System.Windows 
{ 
    public class DeferrableContentConverter : TypeConverter
    { 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (typeof(Stream).IsAssignableFrom(sourceType) || sourceType == typeof(byte[]))
            { 
                return true;
            } 
 
            return base.CanConvertFrom(context, sourceType);
        } 

        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            if (value != null) 
            {
                if (context == null) 
                { 
                    throw new ArgumentNullException("context");
                } 

                XamlSchemaContext xamlSchemaContext =
                    RequireService(context).SchemaContext;
                Baml2006SchemaContext schemaContext = xamlSchemaContext as Baml2006SchemaContext; 
                if (schemaContext == null)
                { 
                    throw new InvalidOperationException(SR.Get(SRID.ExpectedBamlSchemaContext)); 
                }
 
                IXamlObjectWriterFactory objectWriterFactory =
                    RequireService(context);
                IProvideValueTarget ipvt =
                    RequireService(context); 
                IRootObjectProvider rootObjectProvider =
                    RequireService(context); 
 
                ResourceDictionary dictionary = ipvt.TargetObject as ResourceDictionary;
                if (dictionary == null) 
                {
                    throw new InvalidOperationException(SR.Get(SRID.ExpectedResourceDictionaryTarget));
                }
 
                Stream stream = value as Stream;
                if (stream == null) 
                { 
                    byte[] bytes = value as byte[];
                    if (bytes != null) 
                    {
                        stream = new MemoryStream(bytes);
                    }
                } 
                if (stream == null)
                { 
                    throw new InvalidOperationException(SR.Get(SRID.ExpectedBinaryContent)); 
                }
 
                //
                DeferrableContent deferrableContext = new DeferrableContent(stream, schemaContext,
                    objectWriterFactory, context, rootObjectProvider.RootObject);
                return deferrableContext; 
            }
 
            return base.ConvertFrom(context, culture, value); 
        }
 
        private static T RequireService(IServiceProvider provider) where T : class
        {
            T result = provider.GetService(typeof(T)) as T;
            if (result == null) 
            {
                throw new InvalidOperationException(SR.Get(SRID.DeferringLoaderNoContext, typeof(DeferrableContentConverter).Name, typeof(T).Name)); 
            } 
            return result;
        } 
    }
}

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

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