Shulou(Shulou.com)06/02 Report--

This article introduces how to use Middleware components in ASP.NET, the content is very detailed, interested friends can refer to, hope to be helpful to you.

ASP.NET Core introduces the concept of middleware (middleware) to define HTTP pipeline (pipeline). Middleware is a series of components that come together to form a web application. The concept was inspired by OWIN and Katana, and similar functionality was provided in earlier versions of ASP.NET.

A middleware is a component in the HTTP pipeline. The middleware is executed one by one, and the next middleware is chained in the pipeline. Each middleware can terminate the call chain. For example, if the authentication process fails, the authentication middleware will not execute the next middleware. The following figure illustrates the execution process.

In addition to the middleware built into ASP.NET Core, we can also create new middleware. If you need custom middleware, you can write a class that must contain methods that take HttpContext as the first parameter. This method allows for the addition of other parameters, which can be parsed by dependency injection. The following class defines a logging middleware:

Public class RequestLoggerMiddleware {private readonly RequestDelegate _ next; private readonly ILogger _ logger; public RequestLoggerMiddleware (RequestDelegate next, ILoggerFactory loggerFactory) {_ next = next; _ logger = loggerFactory.CreateLogger ();} public async Task Invoke (HttpContext context) {_ logger.LogInformation ("Handling request:" + context.Request.Path); await _ next.Invoke (context); _ logger.LogInformation ("Finished handling request.");}}

Middleware must be registered in the Configure method of the Startup class before it can be executed.

Public void Configure (IApplicationBuilder app) {app.UseMiddleware ();}

It is important to note that the order in which middleware is executed depends on the order in which they are added to the pipeline. This means that some effort must be made to determine the implicit dependencies between middleware. For example, a component uses session state, but if it executes before the session middleware, it can cause a crash.

With ASP.NET Core's concept of "paying for the resources you use", the performance of some applications may improve because only explicitly configured middleware is executed. The framework is no longer dependent on System.Web.dll; components that will be provided in the form of NuGet packages. This also means that NuGet will be responsible for updating the components, and each middleware can be updated independently.

On how to use Middleware components in ASP.NET to share here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.