Raygun.io Plugin for .NET Framework
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Raygun.io Provider for .NET Framework


  • The easiest way to install this provider is by grabbing the NuGet package. Ensure the NuGet Visual Studio extension is installed, right-click on your project -> Manage Nuget Packages -> Online -> search for Mindscape.Raygun4Net, then install it. Or, visit https://nuget.org/packages/Mindscape.Raygun4Net/ for instructions on installation using the package manager console.

  • For Visual Studio 2008 (without NuGet) you can clone this repository, run build.bat, then add project references to Mindscape.Raygun4Net.dll and Newtonsoft.Json.dll.

  • If you have issues trying to install the package into a WinRT project, see the troubleshooting section below.

Where is my app API key?

When sending exceptions to the Raygun.io service, an app API key is required to map the messages to your application.

When you create a new application on your Raygun.io dashboard, your app API key is displayed at the top of the instructions page. You can also find the API key by clicking the "Application Settings" button in the side bar of the Raygun.io dashboard.


The main classes can be found in the Mindscape.Raygun4Net namespace.



Add a section to configSections:

<section name="RaygunSettings" type="Mindscape.Raygun4Net.RaygunSettings, Mindscape.Raygun4Net"/>

Add the Raygun settings configuration block from above:

<RaygunSettings apikey="API_KEY_FOR_YOUR_APPLICATION" />

You can then either create a new instance of the RaygunClient class and call Send(Exception) e.g.

protected void Application_Error()
  var exception = Server.GetLastError();
  new RaygunClient().Send(exception);

Or there is an HttpModule you can add.

For system.web:

  <add name="RaygunErrorModule" type="Mindscape.Raygun4Net.RaygunHttpModule"/>

For system.webServer:

  <add name="RaygunErrorModule" type="Mindscape.Raygun4Net.RaygunHttpModule"/>

WinForms/WPF/Other .NET applications

Create an instance of RaygunClient by passing your app API key in the constructor. Attach an event handler to the DispatcherUnhandledException event of your application. In the event handler, use the RaygunClient.Send method to send the Exception.

private RaygunClient _client = new RaygunClient("YOUR_APP_API_KEY");

public App()
  DispatcherUnhandledException += OnDispatcherUnhandledException;

void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)


Create a RaygunClient instance and pass in your app API key into the constructor. Then add a handler to the UnhandledException event to pick up exceptions from the UI thread. Note that for WinRT you are required to pass the whole UnhandledExceptionEventArgs object to Send().

public App()
  UnhandledException += App_UnhandledException;

void App_UnhandledException(object sender, UnhandledExceptionEventArgs e)

Limitations of WinRT UnhandledException event and Wrap() workarounds

The options available in WinRT for catching unhandled exceptions at this point in time are more limited compared to the options in the more mature .NET framework. The UnhandledException event will be raised when invalid XAML is parsed, in addition to other runtime exceptions that happen on the main UI thread. While many errors will be picked up this way and therefore be able to be sent to Raygun, others will be missed by this exception handler. In particular asynchronous code or Tasks that execute on background threads will not have their exceptions caught.

A workaround for this issue is provided with the Wrap() method. These allow you to pass the code you want to execute to an instance of the Raygun client - it will simply call it surrounded by a try-catch block. If the method you pass in does result in an exception being thrown this will be transmitted to Raygun, and the exception will again be thrown. Two overloads are available; one for methods that return void and another for methods that return an object.


Another option is to use the Fody library, and its AsyncErrorHandling extension. This will automatically catch async exceptions and pass them to a handler of your choice (which would send to Raygun as above). See the installation instructions here, then check out the sample project for how to use.

Windows Phone 7.1 and 8

Create a RaygunClient instance and pass in your app API key into the constructor. In the UnhandledException event handler of App.xaml.cs, use the RaygunClient to send the arguments.

private RaygunClient _client = new RaygunClient("YOUR_APP_API_KEY");

private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)

Xamarin for Android

In the main/entry Activity of your application, use the static RaygunClient.Attach method using your app API key.


Xamarin for iOS

In the main entry point of the application, use the static RaygunClient.Attach method using your app API key.

static void Main (string[] args)

  UIApplication.Main (args, null, "AppDelegate");

Version numbering and tags

  • If you are plugging this provider into a classic .NET application, the version number that will be transmitted will be the AssemblyVersion. There is also an overload of Send() available where you can provide a different version if you wish (in the format x.x.x.x where x is a postive integer).

  • If you are using WinRT, the transmitted version number will be that of the Windows Store package, set in in Package.appxmanifest (under Packaging).

  • You can also set an arbitrary number of tags (as an array of strings), i.e. for tagging builds. This is optional and will be transmitted in addition to the version number above.


  • If the solution fails to build due to missing dependencies (Newtonsoft etc), in Visual Studio 2012 ensure you have the NuGet extension installed and that the Tools -> Options -> Package Manager -> 'Allow Nuget to download missing packages during build' box is checked. Then, go to the directory that you cloned this repository into and run build.bat.

  • When installing the package via NuGet into a WinRT project you encounter an error due to an invalid dependency, clone this repository into a directory via Git. Then, open a Powershell or command prompt in the directory location, and run .\build.bat CompileWinRT. Then, add the resulting Mindscape.Raygun4Net.WinRT.dll (located in the /release folder) to your project.