![]() ![]() For more information, see this GitHub issue. Note: You can't extend the ASP.NET Core app when you override Configure. To invoke afterward, position the service registration after the library is added.Position the service registration before the library is added to the service container.To invoke an IStartupFilter middleware before a middleware added by a library's IStartupFilter: Libraries may add middleware with one or more IStartupFilter implementations that run before or after other app middleware registered with IStartupFilter. If ordering is important, order their IStartupFilter service registrations to match the order that their middlewares should run. Multiple IStartupFilter implementations may interact with the same objects. Option String: execution order is set by the order of IStartupFilter registrations: When a query string parameter for option is provided, the middleware processes the value assignment before the ASP.NET Core middleware renders the response: = "Privacy Append query string ?option=hello The IStartupFilter is registered in Program.cs: using WebStartup.Middleware Public class RequestSetOptionsStartupFilter : IStartupFilter The RequestSetOptionsMiddleware is configured in the RequestSetOptionsStartupFilter class: namespace WebStartup.Middleware HttpContext.Items = WebUtility.HtmlEncode(option) Test with public async Task Invoke(HttpContext httpContext) Public RequestSetOptionsMiddleware(RequestDelegate next) The RequestSetOptionsMiddleware middleware sets an options value from a query string parameter: public class RequestSetOptionsMiddleware The following example demonstrates how to register a middleware with IStartupFilter. Filters may add middleware before or after passing control to the next filter, thus they append to the beginning or end of the app pipeline. The filters are invoked in the order they were added to the service container. For more information, see Create a middleware pipeline with IApplicationBuilder.Įach IStartupFilter can add one or more middlewares in the request pipeline. An IApplicationBuilder defines a class to configure an app's request pipeline. IStartupFilter implements Configure, which receives and returns an Action. IStartupFilter.Configure can set a middleware to run before or after middleware added by libraries. To create a pipeline of Configure methods.To configure middleware at the beginning or end of an app's middleware pipeline without an explicit call to Use on behalf of the app author.The ServerReady event in represents the point where the server is ready to respond to requests.įor more information on application startup, see ASP.NET Core fundamentals overview. Var builder = WebApplication.CreateBuilder(args) ī() Īpps using EventSource can measure the startup time to understand and optimize startup performance. ASP.NET Core apps created with the web templates contain the application startup code in the Program.cs file. ![]()
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