RoutedEventConverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Markup / RoutedEventConverter.cs / 1305600 / RoutedEventConverter.cs
                        
                        
                            // Copyright (C) Microsoft Corporation.  All rights reserved. 

using System.ComponentModel;
using System.Globalization;
 
using System.Windows;
using System.Collections.Generic; 
using System.Xaml; 

namespace System.Windows.Markup 
{
    /// 
    ///     Type converter for RoutedEvent type
    ///  
    public sealed class RoutedEventConverter : TypeConverter
    { 
        ///  
        ///     Whether we can convert from a given type - this class only converts from string
        ///  
        public override bool CanConvertFrom(ITypeDescriptorContext typeDescriptorContext, Type sourceType)
        {
            // We can only convert from a string and that too only if we have all the contextual information
            // Note: Sometimes even the serializer calls CanConvertFrom in order 
            // to determine if it is a valid converter to use for serialization.
            if (sourceType == typeof(string)) 
            { 
                return true;
            } 

            return false;
        }
 
        /// 
        ///     Whether we can convert to a given type - this class only converts to string 
        ///  
        public override bool CanConvertTo(ITypeDescriptorContext typeDescriptorContext, Type destinationType)
        { 
            return false;
        }

        ///  
        ///     Convert a string like "Button.Click" into the corresponding RoutedEvent
        ///  
        public override object ConvertFrom(ITypeDescriptorContext typeDescriptorContext, 
                                           CultureInfo cultureInfo,
                                           object source) 
        {
            string routedEventName = source as string;
            RoutedEvent routedEvent = null;
 
            if (routedEventName != null)
            { 
                routedEventName = routedEventName.Trim(); 
                IServiceProvider serviceProvider = typeDescriptorContext as IServiceProvider;
 
                if (serviceProvider != null)
                {
                    IXamlTypeResolver resolver = serviceProvider.GetService(typeof(IXamlTypeResolver)) as IXamlTypeResolver;
                    Type type = null; 

                    if (resolver != null) 
                    { 
                        // Verify that there's at least one period.  (A simple
                        //  but not foolproof check for "[class].[event]") 
                        int lastIndex = routedEventName.IndexOf('.');
                        if (lastIndex != -1)
                        {
                            string typeName = routedEventName.Substring(0, lastIndex); 
                            routedEventName = routedEventName.Substring(lastIndex + 1);
 
                            type = resolver.Resolve(typeName); 
                        }
                    } 

                    if (type == null)
                    {
                        IXamlSchemaContextProvider schemaContextProvider = (typeDescriptorContext. 
                            GetService(typeof(IXamlSchemaContextProvider))
                                as IXamlSchemaContextProvider); 
 
                        IAmbientProvider iapp = serviceProvider.GetService(typeof(IAmbientProvider)) as IAmbientProvider;
 
                        if (schemaContextProvider != null && iapp != null)
                        {
                            XamlSchemaContext schemaContext = schemaContextProvider.SchemaContext;
 
                            XamlType styleXType = schemaContext.GetXamlType(typeof(Style));
 
                            List ceilingTypes = new List(); 
                            ceilingTypes.Add(styleXType);
 
                            XamlMember styleTargetType = styleXType.GetMember("TargetType");

                            AmbientPropertyValue firstAmbientValue = iapp.GetFirstAmbientValue(ceilingTypes, styleTargetType);
 
                            if (firstAmbientValue != null)
                            { 
                                type = firstAmbientValue.Value as Type; 
                            }
                            if (type == null) 
                            {
                                type = typeof(FrameworkElement);
                            }
                        } 
                    }
 
                    if (type != null) 
                    {
                        Type currentType = type; 

                        // Force load the Statics by walking up the hierarchy and running class constructors
                        while (null != currentType)
                        { 
                            MS.Internal.WindowsBase.SecurityHelper.RunClassConstructor(currentType);
                            currentType = currentType.BaseType; 
                        } 

                        routedEvent = EventManager.GetRoutedEventFromName(routedEventName, type); 
                    }
                }
            }
 
            if (routedEvent == null)
            { 
                // Falling through here means we are unable to perform the conversion. 
                throw GetConvertFromException(source);
            } 

            return routedEvent;
        }
 
        /// 
        ///     Convert a RoutedEventID into a XAML string like "Button.Click" 
        ///  
        public override object ConvertTo(ITypeDescriptorContext typeDescriptorContext,
                                         CultureInfo cultureInfo, 
                                         object value,
                                         Type destinationType)
        {
            if (value == null) 
            {
                throw new ArgumentNullException("value"); 
            } 
            else if (destinationType == null)
            { 
                throw new ArgumentNullException("destinationType");
            }
            else
            { 
                throw GetConvertToException(value, destinationType);
            } 
        } 

        // This routine is copied from TemplateBamlRecordReader.  This functionality 
        //  is planned to be part of the utilities exposed by the parser, eliminating
        //  the need to duplicate code.  See task #18279
        private string ExtractNamespaceString(ref string nameString, ParserContext parserContext)
        { 
            // The colon is what we look for to determine if there's a namespace prefix specifier.
            int nsIndex = nameString.IndexOf(':'); 
            string nsPrefix = string.Empty; 
            if (nsIndex != -1)
            { 
                // Found a namespace prefix separator, so create replacement propertyName.
                // String processing - split "foons" from "BarClass.BazProp"
                nsPrefix = nameString.Substring(0, nsIndex);
                nameString = nameString.Substring(nsIndex + 1); 
            }
 
            // Find the namespace, even if its the default one 
            string namespaceURI = parserContext.XmlnsDictionary[nsPrefix];
            if (namespaceURI == null) 
            {
                throw new ArgumentException(SR.Get(SRID.ParserPrefixNSProperty, nsPrefix, nameString));
            }
 
            return namespaceURI;
        } 
    } 
}
 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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RoutedEventConverter.cs source code in C# .NET

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