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AspNetCore.AsyncInitialization

A simple helper to perform async application initialization in ASP.NET Core 2.x.

Note: This project supports only ASP.NET Core 2.x. If you need to perform async initialization for the generic host (.NET Core 2.1+ and ASP.NET Core 3), use Extensions.Hosting.AsyncInitialization instead.

Usage

1. Install the AspNetCore.AsyncInitialization NuGet package:

   Command line:

   dotnet add package AspNetCore.AsyncInitialization
   

   Package manager console:

   Install-Package AspNetCore.AsyncInitialization
   

2. Create a class (or several) that implements IAsyncInitializer. This class can depend on any registered service.

   public class MyAppInitializer : IAsyncInitializer
   {
       public MyAppInitializer(IFoo foo, IBar bar)
       {
           ...
       }
   
       public async Task InitializeAsync()
       {
           // Initialization code here
       }
   }
   

3. Register your initializer(s) in the Startup.ConfigureServices method:

       services.AddAsyncInitializer<MyAppInitializer>();
   

4. In the Program class, make the Main method async and change its code to initialize the host before running it:

   public static async Task Main(string[] args)
   {
       var host = CreateWebHostBuilder(args).Build();
       await host.InitAsync();
       host.Run();
   }
   

(Note that you need to set the C# language version to 7.1 or higher in your project to enable the "async Main" feature.)

This will run each initializer, in the order in which they were registered.