RoutedEventConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Markup / RoutedEventConverter.cs / 1 / RoutedEventConverter.cs
                        
                        
                            // Copyright (C) Microsoft Corporation.  All rights reserved. 

using System.ComponentModel;
using System.Globalization;
 
using System.Windows;
 
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) && 
                (typeDescriptorContext is TypeConvertContext))
            { 
                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;

            if( routedEventName != null )
            { 
                IServiceProvider serviceProvier = typeDescriptorContext as IServiceProvider;
 
                if (serviceProvier != null) 
                {
                    TypeConvertContext typeConvertContext = typeDescriptorContext as TypeConvertContext; 

                    ParserContext parserContext = typeConvertContext == null ? null : typeConvertContext.ParserContext;

                    if( parserContext != null ) 
                    {
                        XamlTypeMapper xamlTypeMapper = parserContext.XamlTypeMapper; 
 
                        if( xamlTypeMapper != null )
                        { 
                            RoutedEvent routedEvent;
                            string nameSpace;

                            nameSpace = ExtractNamespaceString( ref routedEventName, parserContext ); 

                            // Verify that there's at least one period.  (A simple 
                            //  but not foolproof check for "[class].[event]") 
                            if( routedEventName.IndexOf('.') != -1 )
                            { 
                                // When xamlTypeMapper is told to look for RoutedEventID,
                                //  we need "[class].[event]" because at this point we
                                //  have no idea what the owner type might be.
                                // Fortunately, given "[class].[event]" xamlTypeMapper.GetRoutedEventID 
                                //  can figure things out, so at this point we can pass
                                //  in 'null' for the ownerType and things will still work. 
                                routedEvent = xamlTypeMapper.GetRoutedEvent(null /* ownerType */, nameSpace, routedEventName); 

                                return routedEvent; 
                            }
                        }
                    }
                } 
            }
 
            // Falling through here means we are unable to perform the conversion. 
            throw GetConvertFromException(source);
        } 

        /// 
        ///     Convert a RoutedEventID into a XAML string like "Button.Click"
        ///  
        public override object ConvertTo(ITypeDescriptorContext typeDescriptorContext,
                                         CultureInfo cultureInfo, 
                                         object value, 
                                         Type destinationType)
        { 
            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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