EventSetterHandlerConverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / EventSetterHandlerConverter.cs / 1305600 / EventSetterHandlerConverter.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 EventSetterHandlerConverter : 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) 
        {
            if (typeDescriptorContext == null)
            {
                throw new ArgumentNullException("typeDescriptorContext"); 
            }
            if (source == null) 
            { 
                throw new ArgumentNullException("source");
            } 
            IRootObjectProvider rootProvider = typeDescriptorContext.GetService(typeof(IRootObjectProvider)) as IRootObjectProvider;
            if (rootProvider != null && source is String)
            {
                IProvideValueTarget ipvt = typeDescriptorContext.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget; 
                if (ipvt != null)
                { 
                    EventSetter setter = ipvt.TargetObject as EventSetter; 
                    string handlerName;
                    if(setter != null && (handlerName = source as string) != null) 
                    {
                        handlerName = handlerName.Trim();
                        return Delegate.CreateDelegate(setter.Event.HandlerType, rootProvider.RootObject, handlerName);
                    } 
                }
            } 
 
            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);
        }
    }
} 

 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
// 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 EventSetterHandlerConverter : 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) 
        {
            if (typeDescriptorContext == null)
            {
                throw new ArgumentNullException("typeDescriptorContext"); 
            }
            if (source == null) 
            { 
                throw new ArgumentNullException("source");
            } 
            IRootObjectProvider rootProvider = typeDescriptorContext.GetService(typeof(IRootObjectProvider)) as IRootObjectProvider;
            if (rootProvider != null && source is String)
            {
                IProvideValueTarget ipvt = typeDescriptorContext.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget; 
                if (ipvt != null)
                { 
                    EventSetter setter = ipvt.TargetObject as EventSetter; 
                    string handlerName;
                    if(setter != null && (handlerName = source as string) != null) 
                    {
                        handlerName = handlerName.Trim();
                        return Delegate.CreateDelegate(setter.Event.HandlerType, rootProvider.RootObject, handlerName);
                    } 
                }
            } 
 
            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);
        }
    }
} 

 

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

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