CommandValueSerializer.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Input / Command / CommandValueSerializer.cs / 1 / CommandValueSerializer.cs
                        
                        
                            //------------------------------------------------------------------------ 
//
//  Microsoft Windows Client Platform
//  Copyright (C) Microsoft Corporation, 2005
// 
//  File:      CommandValueSerializer.cs
// 
//  Contents:  ValueSerializer for the ICommand interface 
//
//  Created:   04/28/2005 chuckj 
//
//-----------------------------------------------------------------------

namespace System.Windows.Input 
{
    using System; 
    using System.Collections.Generic; 
    using System.Text;
    using System.Windows.Markup; 
    using System.Windows.Documents; // EditingCommands
    using System.Reflection;

    internal class CommandValueSerializer : ValueSerializer 
    {
        public override bool CanConvertToString(object value, IValueSerializerContext context) 
        { 
            if (context == null || context.GetValueSerializerFor(typeof(Type)) == null)
                return false; 

            // Can only convert routed commands
            RoutedCommand command = value as RoutedCommand;
 
            if (command == null || command.OwnerType == null)
            { 
                return false; 
            }
 
            if (CommandConverter.IsKnownType(command.OwnerType))
            {
                return true;
            } 
            else
            { 
                string localName = command.Name + "Command"; 
                Type ownerType = command.OwnerType;
                string typeName = ownerType.Name; 

                // Get them from Properties
                PropertyInfo propertyInfo = ownerType.GetProperty(localName, BindingFlags.Public | BindingFlags.Static);
                if (propertyInfo != null) 
                    return true;
 
                // Get them from Fields (ScrollViewer.PageDownCommand is a static readonly field 
                FieldInfo fieldInfo = ownerType.GetField(localName, BindingFlags.Static | BindingFlags.Public);
                if (fieldInfo != null) 
                    return true;
            }

            return false; 
        }
 
        public override bool CanConvertFromString(string value, IValueSerializerContext context) 
        {
            return true; 
        }

        public override string ConvertToString(object value, IValueSerializerContext context)
        { 
            if (value != null)
            { 
                RoutedCommand command = value as RoutedCommand; 
                if (null != command && null != command.OwnerType)
                { 
                    // Known Commands, so write shorter version
                    if (CommandConverter.IsKnownType(command.OwnerType))
                    {
                        return command.Name; 
                    }
                    else 
                    { 
                        ValueSerializer typeSerializer = null;
 
                        if (context == null)
                        {
                            throw new InvalidOperationException(SR.Get(SRID.ValueSerializerContextUnavailable, this.GetType().Name ));
                        } 

                        // Get the ValueSerializer for the System.Type type 
                        typeSerializer = context.GetValueSerializerFor(typeof(Type)); 
                        if (typeSerializer == null)
                        { 
                            throw new InvalidOperationException(SR.Get(SRID.TypeValueSerializerUnavailable, this.GetType().Name ));
                        }

                        return typeSerializer.ConvertToString(command.OwnerType, context) + "." + command.Name + "Command"; 
                    }
                } 
            } 
            else
                return string.Empty; 

            throw GetConvertToException(value, typeof(string));
        }
 
        public override IEnumerable TypeReferences(object value, IValueSerializerContext context)
        { 
            if (value != null) 
            {
                RoutedCommand command = value as RoutedCommand; 
                if (command != null)
                {
                    if (command.OwnerType != null && !CommandConverter.IsKnownType(command.OwnerType))
                    { 
                        return new Type[] { command.OwnerType };
                    } 
                } 
            }
            return base.TypeReferences(value, context); 
        }

        public override object ConvertFromString(string value, IValueSerializerContext context)
        { 
            if (value != null)
            { 
                if (value != String.Empty) 
                {
                    Type declaringType = null; 
                    String commandName;

                    // Check for "ns:Class.Command" syntax.
 
                    int dotIndex = value.IndexOf('.');
                    if (dotIndex >= 0) 
                    { 
                        // We have "ns:Class.Command" syntax.
 
                        // Find the type name in the form of "ns:Class".
                        string typeName = value.Substring(0, dotIndex);

                        if (context == null) 
                        {
                            throw new InvalidOperationException(SR.Get(SRID.ValueSerializerContextUnavailable, this.GetType().Name )); 
                        } 

                        // Get the ValueSerializer for the System.Type type 
                        ValueSerializer typeSerializer = context.GetValueSerializerFor(typeof(Type));
                        if (typeSerializer == null)
                        {
                            throw new InvalidOperationException(SR.Get(SRID.TypeValueSerializerUnavailable, this.GetType().Name )); 
                        }
 
 
                        // Use the TypeValueSerializer to parse the "ns:Class" into a System.Type.
                        declaringType = typeSerializer.ConvertFromString(typeName, context) as Type; 

                        // Strip out the "Command" part of "ns:Class.Command".
                        commandName = value.Substring(dotIndex + 1).Trim();
                    } 
                    else
                    { 
                        // Assume the known commands 
                        commandName = value.Trim();
                    } 

                    // Find the command given the declaring type & name (this is shared with CommandConverter)
                    ICommand command = CommandConverter.ConvertFromHelper( declaringType, commandName );
 
                    if (command != null)
                    { 
                        return command; 
                    }
                } 
                else
                {
                    return null; // String.Empty <==> null , (for roundtrip cases where Command property values are null)
                } 
            }
 
            return base.ConvertFromString(value, context); 
        }
 
    }
}

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

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