C# 如何在 ASP.NET Core 中间件中处理请求_C# ASP.NET Core 中间件请求处理教程

public class RequestLoggingMiddleware
{
    private readonly RequestDelegate _next;

    public RequestLoggingMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        // 在请求处理前执行
        Console.WriteLine($"收到请求: {context.Request.Method} {context.Request.Path}");

        // 调用管道中的下一个中间件
        await _next(context);

        // 在响应返回后执行（可选）
        Console.WriteLine("响应已发送");
    }
}

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.UseMiddleware<RequestLoggingMiddleware>();

app.MapGet("/", () => "Hello World");

app.Run();

public async Task InvokeAsync(HttpContext context)
{
    if (context.Request.Path == "/stop")
    {
        context.Response.StatusCode = 403;
        await context.Response.WriteAsync("请求被阻止");
        return; // 不再向下传递
    }

    await _next(context);
}

app.Map("/admin", adminApp =>
{
    adminApp.UseMiddleware<AuthMiddleware>();
    adminApp.Run(async context =>
    {
        await context.Response.WriteAsync("管理员页面");
    });
});