private static void VerifyEndpointRoutingMiddlewareIsRegistered(IApplicationBuilder app, out DefaultEndpointRouteBuilder endpointRouteBuilder)
{
if (!app.TryGetValue(EndpointRouteBuilder, out var obj))
{
var message =
$"{nameof(EndpointRoutingMiddleware)} matches endpoints setup by {nameof(EndpointMiddleware)} and so must be added to the request " +
$"execution pipeline before {nameof(EndpointMiddleware)}. " +
$"Please add {nameof(EndpointRoutingMiddleware)} by calling '{nameof(IApplicationBuilder)}.{nameof(UseRouting)}' inside the call " +
$"to 'Configure(...)' in the application startup code.";
throw new InvalidOperationException(message);
}
// If someone messes with this, just let it crash.
endpointRouteBuilder = (DefaultEndpointRouteBuilder)obj;
// This check handles the case where Map or something else that forks the pipeline is called between the two
// routing middleware.
if (!object.ReferenceEquals(app, endpointRouteBuilder.ApplicationBuilder))
{
var message =
$"The {nameof(EndpointRoutingMiddleware)} and {nameof(EndpointMiddleware)} must be added to the same {nameof(IApplicationBuilder)} instance. " +
$"To use Endpoint Routing with 'Map(...)', make sure to call '{nameof(IApplicationBuilder)}.{nameof(UseRouting)}' before " +
$"'{nameof(IApplicationBuilder)}.{nameof(UseEndpoints)}' for each branch of the middleware pipeline.";
throw new InvalidOperationException(message);
}
}