MessageQueueConverter.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 / ndp / fx / src / Services / Messaging / System / Messaging / Design / MessageQueueConverter.cs / 1305376 / MessageQueueConverter.cs
                        

                        
                             //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

 namespace System.Messaging.Design { 
    using System.Messaging; 
    using System.Threading;
    using System.ComponentModel; 
    using System.ComponentModel.Design;
    using System.Diagnostics;
    using System;
    using System.Drawing; 
    using System.Windows.Forms;
    using System.Windows.Forms.Design; 
    using System.Windows.Forms.ComponentModel; 
    using System.ComponentModel.Design.Serialization;
    using System.Reflection; 
    using System.Messaging.Interop;
    using System.Collections;
    using System.Collections.Specialized;
    using System.Globalization; 

    ///  
    ///  
    internal class MessageQueueConverter : TypeConverter {
        private static Hashtable componentsCreated = new Hashtable(StringComparer.InvariantCultureIgnoreCase); 

        /// 
        /// 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { 
            if (sourceType == typeof(string)) {
                return true; 
            } 
            return base.CanConvertFrom(context, sourceType);
        } 

        internal static void AddToCache(MessageQueue queue) {
            componentsCreated[queue.Path] = queue;
        } 

        ///  
        ///  
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
            if (value != null && value is string) { 
                string text = ((string)value).Trim();

                if (text == String.Empty)
                    return null; 

                if (text.CompareTo(Res.GetString(Res.NotSet)) != 0) { 
                    MessageQueue newQueue = GetFromCache(text); 
                    if (newQueue != null)
                        return newQueue; 
                    else {
                        newQueue = new MessageQueue(text);
                        AddToCache(newQueue);
                        if (context != null) 
                            context.Container.Add(newQueue);
 
                        return newQueue; 
                    }
                } 
            }

            return null;
        } 

 
        ///  
        /// 
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
            if (destinationType != null && destinationType == typeof(string)) {
                if (value != null)
                    return((MessageQueue)value).Path;
                else 
                    return Res.GetString(Res.NotSet);
            } 
 
            return base.ConvertTo(context, culture, value, destinationType);
        } 

        internal static MessageQueue GetFromCache(string path) {
            if (componentsCreated.ContainsKey(path)) {
                MessageQueue existingComponent = (MessageQueue)componentsCreated[path]; 
                if (existingComponent.Site == null)
                    componentsCreated.Remove(path); 
                else { 
                    if (existingComponent.Path == path)
                        return existingComponent; 
                    else
                        componentsCreated.Remove(path);
                }
            } 

            return null; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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