hyddan / topshelf.applicationhostbuilder

Extension for Topshelf to be able to host any type of application, not just a Console Application

Topshelf.ApplicationHostBuilder

Extension for Topshelf to be able to use any type of application, not just a Console Application.

Why?

Topshelf requires that you create a project with output type Console Application. This extension removes that requirement. You can use any output type. You can even host your application during unit testing!

Download

https://www.nuget.org/packages/Topshelf.ApplicationHostBuilder/

Release Notes

1.0.1 Incorrect logger for ApplicationHost

Usage

Use the extension method UseApplicationHostBuilder for the host configurator you'll get by initializing the Topshelf HostFactory.

Example

Without command line arguments.

HostFactory.Run(config =>
{
    config.UseApplicationHostBuilder();

    config.Service<MyService>(configurator =>
    {
        configurator.WhenStarted((service, control) => service.Start());
        configurator.WhenStopped(service => service.Stop());
    });
});

With command line arguments.

HostFactory.Run(config =>
{
    using(config.UseApplicationHostBuilder(args))
    {
        config.Service<MyService>(configurator =>
        {
            configurator.WhenStarted((service, control) => service.Start());
            configurator.WhenStopped(service => service.Stop());
        });
    }
});

Caveats

There are some minor caveats.

Test Runners

When using ReSharper's test runner, it will add some arguments when bootstrapping the test assembly. Topshelf parses input arguments by getting them from Environment.GetCommandLineArgs(). It will pick up the arguments from ReSharpers test runner and fail creating the hosting environment. Fortunately they provide a function to override the command line. Use the ApplyCommandLine function on the host configurator supplied by the HostFactory to simulate the behaviour you are testing.

Console Usage

The HelpHost and the TopshelfConsoleTraceListener within Topshelf uses Console's write functions directly, which will not make any sense if you do not have an application that listens to Console's output. Fortunately Console exposes a function (SetOut) making it possible to redirect text being written to Console by rolling your own TextWriter.

Stopping the Application

• When installing the application as a Windows Service, it works just as described in Topshelf's documentation.
• When running it through an automated test, you probably want to use the host controller provided by Topshelf after the hosting has started. See WhenStarted function for ServiceConfigurator<T>.
• When running it from a console/file explorer you need to kill the application from the Task Manager. For now, there is no way to do a graceful stop.
• When debugging from Visual Studio, just hit Stop Debugging. For now, there is no way to do a graceful stop.