Click here to Skip to main content
Click here to Skip to main content
 
Add your own
alternative version

Introducing the Model Thread View Thread Pattern

, 1 May 2010 BSD
Reduce threading code, and increase UI responsiveness with a new pattern extending MVVM.
Mtvt_2010_5_1__12_15.zip
Libraries
DanielVaughan
DanielVaughan.Silverlight.dll
DanielVaughan.Silverlight.pdb
Microsoft.Practices.ServiceLocation.dll
Microsoft.Practices.Unity.dll
System.ServiceModel.PollingDuplex.dll
System.Xml.Linq.dll
Prism
Silverlight
Microsoft.Practices.Composite.dll
Microsoft.Practices.Composite.pdb
Microsoft.Practices.Composite.Presentation.dll
Microsoft.Practices.Composite.Presentation.pdb
Microsoft.Practices.ServiceLocation.dll
System.Windows.Controls.dll
Mtvt
DanielVaughan.Mtvt.suo
DanielVaughan.Mtvt.vsmdi
Local.testsettings
TraceAndTestImpact.testsettings
DanielVaughan.MtvtExample
Bin
Debug
ar
bg
ca
cs
da
de
el
es
et
eu
fi
fr
he
hr
hu
id
it
ja
ko
lt
lv
ms
nl
no
pl
Properties
pt
pt-BR
ro
ru
sk
sl
sr-Cyrl-CS
sr-Latn-CS
sv
th
tr
uk
vi
zh-Hans
zh-Hant
Release
Collections
CommandModel
ComponentModel
Concurrency
Diagrams
OverviewDiagram.cd
Images
WpfDisciplesBanner.png
obj
Debug
DanielVaughan.MtvtExample.g.resources
DesignTimeResolveAssemblyReferences.cache
DesignTimeResolveAssemblyReferencesInput.cache
TempPE
Properties
Service References
UIModel
DanielVaughan.MtvtExample.Tests
Bin
Debug
ar
bg
ca
cs
da
de
el
es
et
eu
fi
fr
he
hr
hu
id
it
ja
ko
lt
lv
ms
nl
no
pl
Properties
pt
pt-BR
ro
ru
sk
sl
sr-Cyrl-CS
sr-Latn-CS
sv
th
tr
uk
vi
zh-Hans
zh-Hant
Release
Mocks
obj
Debug
DanielVaughan.MtvtExample.Tests.g.resources
DesignTimeResolveAssemblyReferencesInput.cache
ResolveAssemblyReference.cache
TempPE
Properties
DanielVaughan.MtvtExample.Web
bin
ClientBin
obj
Debug
DesignTimeResolveAssemblyReferencesInput.cache
TempPE
Properties
Prism
CAL
CAL.vsmdi
CompositeApplicationLibrary.4.5.resharper.user
CompositeApplicationLibrary_Desktop.4.5.resharper.user
LocalTestRun.testrunconfig
Desktop
Composite
OpenSource.snk
bin
Events
Logging
Modularity
obj
Debug
Composite.Desktop.csproj.GenerateResource.Cache
Microsoft.Practices.Composite.dll
Microsoft.Practices.Composite.pdb
Microsoft.Practices.Composite.Properties.Resources.resources
ResolveAssemblyReference.cache
TempPE
Release
Composite.Desktop.csproj.GenerateResource.Cache
Microsoft.Practices.Composite.dll
Microsoft.Practices.Composite.pdb
Microsoft.Practices.Composite.Properties.Resources.resources
TempPE
Properties.Resources.Designer.cs.dll
Properties
Regions
Composite.Presentation
OpenSource.snk
bin
Commands
Events
obj
Debug
Composite.Presentation.Desktop.csproj.GenerateResource.Cache
Microsoft.Practices.Composite.Presentation.dll
Microsoft.Practices.Composite.Presentation.pdb
Microsoft.Practices.Composite.Presentation.Properties.Resources.resources
ResolveAssemblyReference.cache
TempPE
Release
Composite.Presentation.Desktop.csproj.GenerateResource.Cache
Microsoft.Practices.Composite.Presentation.dll
Microsoft.Practices.Composite.Presentation.pdb
Microsoft.Practices.Composite.Presentation.Properties.Resources.resources
ResolveAssemblyReference.cache
TempPE
Properties.Resources.Designer.cs.dll
Properties
Regions
Behaviors
Silverlight
Composite
Composite.Silverlight.csproj.user
Migrated rules for Composite.Silverlight.ruleset
Bin
Events
Logging
Modularity
obj
Debug
Composite.Silverlight.csproj.GenerateResource.Cache
DesignTimeResolveAssemblyReferencesInput.cache
Microsoft.Practices.Composite.dll
Microsoft.Practices.Composite.pdb
Microsoft.Practices.Composite.Properties.Resources.resources
ResGen.read.1.tlog
ResGen.write.1.tlog
ResolveAssemblyReference.cache
TempPE
Properties.Resources.Designer.cs.dll
Release
Composite.Silverlight.csproj.GenerateResource.Cache
Microsoft.Practices.Composite.dll
Microsoft.Practices.Composite.pdb
Microsoft.Practices.Composite.Properties.Resources.resources
TempPE
Properties
Regions
Composite.Presentation
Composite.Presentation.Silverlight.csproj.user
Migrated rules for Composite.Presentation.Silverlight.ruleset
Bin
Commands
Events
obj
Debug
build.force
Composite.Presentation.Silverlight.csproj.GenerateResource.Cache
DesignTimeResolveAssemblyReferencesInput.cache
Microsoft.Practices.Composite.Presentation.dll
Microsoft.Practices.Composite.Presentation.pdb
Microsoft.Practices.Composite.Presentation.Properties.Resources.resources
ResGen.read.1.tlog
ResGen.write.1.tlog
ResolveAssemblyReference.cache
TempPE
Release
Composite.Presentation.Silverlight.csproj.GenerateResource.Cache
Microsoft.Practices.Composite.Presentation.dll
Microsoft.Practices.Composite.Presentation.pdb
Microsoft.Practices.Composite.Presentation.Properties.Resources.resources
ResolveAssemblyReference.cache
TempPE
Properties
Regions
Behaviors
LIB
Silverlight
ServiceLocation
Microsoft.Practices.ServiceLocation.dll
#region File and License Information
/*
<File>
	<Copyright>Copyright © 2009, Daniel Vaughan. All rights reserved.</Copyright>
	<License>
	This file is part of DanielVaughan's base library

    DanielVaughan's base library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    DanielVaughan's base library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with DanielVaughan's base library.  If not, see http://www.gnu.org/licenses/.
	</License>
	<Owner Name="Daniel Vaughan" Email="dbvaughan@gmail.com"/>
	<CreationDate>2010-04-22 17:26:58Z</CreationDate>
</File>
*/
#endregion

using System;
using System.Reflection;

namespace DanielVaughan.Concurrency
{
	/// <summary>
	/// Allows a <see cref="Delegate"/> to be referenced directly
	/// or using a <see cref="WeakReference"/>.
	/// </summary>
	public class DelegateReference
	{
		readonly Delegate delegateToReference;
		readonly WeakReference delegateWeakReference;
		readonly MethodInfo method;
		readonly Type delegateType;

		/// <summary>
		/// Initializes a new instance of the <see cref="DelegateReference"/> class.
		/// </summary>
		/// <param name="delegateToReference">The target delegate.</param>
		/// <param name="useWeakReference">if set to <c>true</c> a weak reference 
		/// will be used for the target of the <see cref="Delegate"/>.</param>
		public DelegateReference(Delegate delegateToReference, bool useWeakReference)
		{
			ArgumentValidator.AssertNotNull(delegateToReference, "delegateToReference");

			if (useWeakReference)
			{
				delegateWeakReference = new WeakReference(delegateToReference.Target);
				method = delegateToReference.Method;
				delegateType = delegateToReference.GetType();
			}
			else
			{
				this.delegateToReference = delegateToReference;
			}
		}

		public Delegate Delegate
		{
			get
			{
				return delegateToReference ?? GetDelegate();
			}
		}

		Delegate GetDelegate()
		{
			Delegate result = null;
			if (method.IsStatic)
			{
				result = Delegate.CreateDelegate(delegateType, null, method);
			}
			else
			{
				object target = delegateWeakReference.Target;
				if (target != null)
				{
					result = Delegate.CreateDelegate(delegateType, target, method);
				}
			}
			return result;
		}
	}
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The BSD License

Share

About the Author

Daniel Vaughan
President Outcoder
Switzerland Switzerland
Daniel Vaughan is a Microsoft MVP and co-founder of Outcoder, a Swiss software and consulting company dedicated to creating best-of-breed user experiences and leading-edge back-end solutions, using the Microsoft stack of technologies--in particular WPF, WinRT, Windows Phone, and also Xamarin.Forms.
 
Daniel is the author of Windows Phone 8 Unleashed and Windows Phone 7.5 Unleashed, both published by SAMS.
 
Daniel is the developer behind several acclaimed Windows Phone apps including Surfy, Intellicam, and Splashbox; and is the creator of a number of popular open-source projects including Calcium SDK, and Clog.
 
Would you like Daniel to bring value to your organisation? Please contact

Daniel's Blog | MVP profile | Follow on Twitter
 
Windows Phone Experts
Follow on   Twitter   Google+   LinkedIn

| Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.141216.1 | Last Updated 1 May 2010
Article Copyright 2010 by Daniel Vaughan
Everything else Copyright © CodeProject, 1999-2014
Layout: fixed | fluid