What is the use of the 'Map' extension when adding middleware to a C# ASP.NET Core pipeline?

Middleware is a software component assembled into an application pipeline Handle requests and responses.

Each component chooses whether to pass the request to the next component pipeline and can perform certain operations before and after the next component Called in the pipeline.

Map extensions are used as conventions for pipeline branches.

Map extension method is used to match request delegates based on the requested delegate. path.Map simply accepts a path and a function to configure the individual middleware pipeline.

In the example below, any request with a base path of /maptest will be processed Through the pipeline configured in the HandleMapTest method.

Example

private static void HandleMapTest(IApplicationBuilder app){
   app.Run(async context =>{
      await context.Response.WriteAsync("Map Test Successful");
   });
}
public void ConfigureMapping(IApplicationBuilder app){
   app.Map("/maptest", HandleMapTest);
}

In addition to path-based mapping, the MapWhen method also supports predicate-based mapping.

Any predicate of type Func can be used to map requests to New pipeline branch.

private static void HandleBranch(IApplicationBuilder app){
   app.Run(async context =>{
      await context.Response.WriteAsync("Branch used.");
   });
}
public void ConfigureMapWhen(IApplicationBuilder app){
   app.MapWhen(context => {
      return context.Request.Query.ContainsKey("branch");
   }, HandleBranch);
      app.Run(async context =>{
         await context.Response.WriteAsync("Hello from " + _environment);
   });
}

Map can also be nested

app.Map("/level1", level1App => {
   level1App.Map("/level2a", level2AApp => {
      // "/level1/level2a"
      //...
   });
   level1App.Map("/level2b", level2BApp => {
      // "/level1/level2b"
      //...
   });
});

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