ProgramPublisher.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 / cdf / src / WF / RunTime / DebugEngine / ProgramPublisher.cs / 1305376 / ProgramPublisher.cs
                        

                        
                            // Copyright (c) Microsoft Corp., 2004. All rights reserved. 
#region Using directives

using System;
using System.Threading; 
using System.Reflection;
using System.Runtime.InteropServices; 
using System.Diagnostics; 

#endregion 

namespace System.Workflow.Runtime.DebugEngine
{
 	[ComImport, Guid(Guids.CLSID_WDEProgramPublisher)] 
	internal class WDEProgramPublisher
	{ 
	} 

    internal sealed class ProgramPublisher 
 	{
		#region Data members

 		private bool isPublished = false; 
 		IWDEProgramPublisher publisher;
        private DebugController controller; 
		GCHandle gchWdeProgramNode; // This is used to pin the wdeProgramNodeSingleton (VS Debugger is using address to calculate cookies) 
        private IWDEProgramNode wdeProgramNodeSingleton;
 
 		#endregion

		#region Methods
 
        public ProgramPublisher()
        { 
            this.publisher = null; 
        }
 
		public bool Publish(DebugController controller)
		{
 			Debug.WriteLine("WDE: ProgramPublisher.Publish()");
 
			// In order to guarantee that the Program Nodes are always in the MTA, publish on a separate thread.
 			if (isPublished) 
                return false; 

            try 
            {
                this.controller = controller;
                Thread publisherThread = new Thread(PublisherThreadFunc);
                publisherThread.SetApartmentState(ApartmentState.MTA); 
                publisherThread.IsBackground = true;
                publisherThread.Start(); 
                publisherThread.Join(); 
            }
            catch(Exception e) 
            {
                // Eat up exceptions if the debugger is not installed.
                Debug.WriteLine("WDE: ProgramPublisher.Publish() exception: "  + e.ToString());
            } 

            return this.isPublished; 
 		} 

		private void PublisherThreadFunc() 
 		{
            try
            {
                this.publisher = new WDEProgramPublisher() as IWDEProgramPublisher; 
                this.wdeProgramNodeSingleton = new ProgramNode(this.controller);
                this.gchWdeProgramNode = GCHandle.Alloc(this.wdeProgramNodeSingleton); 
 
                this.publisher.Publish(this.wdeProgramNodeSingleton);
                this.isPublished = true; 
            }
            catch(Exception e)
            {
                // Ignore any exceptions that are caused by WDE.dll not being present or registered. 
                Debug.WriteLine("WDE: ProgramPublisher.PublisherThreadFunc() exception: " + e.ToString());
            } 
        } 

		public void Unpublish() 
		{
            if (!isPublished)
                return;
 
            Debug.WriteLine("WDE: ProgramPublisher.Unpublish()");
 
            // In order to guarantee that the Program Nodes are always in the MTA, unpublish on a separate thread. 
            try
            { 
                Thread unpublisherThread = new Thread(UnpublishThreadFunc);
                unpublisherThread.SetApartmentState(ApartmentState.MTA);
                unpublisherThread.IsBackground = true;
                unpublisherThread.Start(); 
                unpublisherThread.Join();
            } 
            catch (Exception e) 
            {
                // Eat up exceptions if the debugger is not installed, etc. 
                Debug.WriteLine("WDE: ProgramPublisher.Unpublish() exception: " + e.ToString());
            }

            Debug.WriteLine("WDE: ProgramPublisher.Unpublish() Done"); 
        }
 
        private void UnpublishThreadFunc() 
        {
			try 
 			{
				this.publisher.Unpublish(this.wdeProgramNodeSingleton);
 			}
 			catch (Exception e) 
			{
                Debug.WriteLine("WDE: ProgramPublisher.UnpublishThreadFunc(): catch exception " + e.ToString()); 
 				// We eat up any exceptions that can occur because the host process is abnormally terminated. 
			}
			finally 
			{
 				this.gchWdeProgramNode.Free();// Rrelease pin on the this.wdeProgramNodeSingleton

				Marshal.ReleaseComObject(this.publisher); 
 				this.publisher = null;
 			} 
 
            this.isPublished = false;
		} 

 		#endregion
	}
 
    [ComImport(), Guid(Guids.IID_IWDEProgramPublisher), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    internal interface IWDEProgramPublisher 
    { 
        void Publish([MarshalAs(UnmanagedType.IUnknown)] object ProgramNode);
        void Unpublish([MarshalAs(UnmanagedType.IUnknown)] object ProgramNode); 
    }


} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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