.NET Web API中如何使用中间件（Middleware）_中间件使用配置指南

public class RequestTimeLoggerMiddleware
{
    private readonly RequestDelegate _next;
    private readonly ILogger<RequestTimeLoggerMiddleware> _logger;
<pre class='brush:php;toolbar:false;'>public RequestTimeLoggerMiddleware(RequestDelegate next, ILogger<RequestTimeLoggerMiddleware> logger)
{
    _next = next;
    _logger = logger;
}

public async Task InvokeAsync(HttpContext context)
{
    var startTime = DateTime.Now;

    await _next(context);

    var duration = DateTime.Now - startTime;
    _logger.LogInformation($"请求 {context.Request.Path} 耗时: {duration.TotalMilliseconds}ms");
}

public static class RequestTimeLoggerExtensions
{
    public static IApplicationBuilder UseRequestTimeLogger(this IApplicationBuilder app)
    {
        return app.UseMiddleware<RequestTimeLoggerMiddleware>();
    }
}

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();
<p>app.UseExceptionHandler("/error"); // 异常处理
app.UseCors(policy => policy.AllowAnyOrigin().AllowAnyMethod()); // CORS
app.UseAuthentication(); // 认证
app.UseAuthorization(); // 授权
app.UseRouting(); // 路由解析</p><p>// 使用自定义中间件
app.UseRequestTimeLogger();</p><p>app.MapControllers(); // 映射控制器</p><p>app.Run();</p>

app.Map("/api", apiApp =>
{
    apiApp.UseRequestTimeLogger();
    apiApp.MapControllers();
});

app.UseAuthorization();
app.UseRouting(); // 错误：应在 UseAuthorization 前调用 UseRouting

app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();