C#•3mo ago

Eagerly compile minimal apis

I want to initialize minimal apis on initialization rather than the first request. Is there a way to manually force it to initialize? Other than making a request to one of the endpoints from within the application.

4 Replies

Unknown User•3mo ago

Message Not Public

SleepWellPupper•3mo ago

A minimal api is a delegate, there's nothing to initialize? The instance is created when you map it.

Unknown User•3mo ago

Message Not Public

Anton•3mo ago

So it seems to resolve each endpoint separately. I wanted to check if they could be called. For example, if it will be able to resolve the services injected into the constructor. The way I figured is calling the endpoint manually. Kind of like this:

app.UseEndpoints(x => {});

using (var scope = app.Services.CreateScope())
{
    var httpContext = new DefaultHttpContext
    {
        RequestServices = scope.ServiceProvider,
    };

    var endpoint = GetEndpoint(httpContext);
    try
    {
        await endpoint.RequestDelegate!(httpContext);
    }
#pragma warning disable CA1031
    // ReSharper disable once EmptyGeneralCatchClause
    catch
#pragma warning restore CA1031
    {
    }

    Endpoint GetEndpoint(HttpContext httpContext)
    {
        var endpointDataSource = httpContext.RequestServices.GetRequiredService<EndpointDataSource>();
        var endpoints = endpointDataSource.Endpoints.OfType<RouteEndpoint>();
        return endpoints.First();
    }
}

app.UseEndpoints(x => {});

using (var scope = app.Services.CreateScope())
{
    var httpContext = new DefaultHttpContext
    {
        RequestServices = scope.ServiceProvider,
    };

    var endpoint = GetEndpoint(httpContext);
    try
    {
        await endpoint.RequestDelegate!(httpContext);
    }
#pragma warning disable CA1031
    // ReSharper disable once EmptyGeneralCatchClause
    catch
#pragma warning restore CA1031
    {
    }

    Endpoint GetEndpoint(HttpContext httpContext)
    {
        var endpointDataSource = httpContext.RequestServices.GetRequiredService<EndpointDataSource>();
        var endpoints = endpointDataSource.Endpoints.OfType<RouteEndpoint>();
        return endpoints.First();
    }
}

But again, this doesn't seem to compile the whole graph.

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Eagerly compile minimal apis