我有一个中间件来记录Web api请求。以下是Configuration中的Startup.cs方法。如果app.UseMiddleware在app.UseMvc之前，则没有任何Web api调用被调用。但是，如果app.UseMiddleware在app.UseMvc之后，则中间件不执行任何操作（即记录请求）。

我提供了以下代码。为什么app.UseMiddleware会干扰asp.UseMvc？

public void Configure(IApplicationBuilder app,IHostingEnvironment env,IServiceProvider services)
{
    // global cors policy
    app.UseCors(x => x
        .AllowAnyOrigin()
        .AllowAnyMethod()
        .AllowAnyHeader());


    app.UseHttpsRedirection();
    app.UseAuthentication();

    app.UseStaticfiles();
    app.UseSpaStaticfiles();

    app.UseMiddleware<ApiLoggingMiddleware>();

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",template: "{controller}/{action=Index}/{id?}");
    });
}

下面是中间件：

 public async Task Invoke(HttpContext httpContext,IApiLogService apiLogService)
 {
     try
     {
         _apiLogService = apiLogService;

         var request = httpContext.Request;
         if (request.Path.StartsWithSegments(new PathString("/api")))
         {
             var stopWatch = Stopwatch.StartNew();
             var requestTime = DateTime.UtcNow;
             var requestBodyContent = await ReadRequestBody(request);
             var originalBodyStream = httpContext.Response.Body;

             await SafeLog(requestTime,stopWatch.ElapsedMilliseconds,200,//response.StatusCode,request.Method,request.Path,request.QueryString.ToString(),requestBodyContent
                   );           
         }
         else
         {
             await _next(httpContext);
         }
     }
     catch (Exception ex)
     {
         await _next(httpContext);
     }
 }