中间插件

中间件和Filter类似，不过Filter更加偏向于业务

1、定义中间插件，RequestDelegate 委托

public class RequestLoggerMiddleware
    {
        private readonly RequestDelegate _next;
        public RequestLoggerMiddleware(RequestDelegate next)
        {
            _next = next;
        }
        public async Task Invoke(HttpContext context)
        {
            try
            {
                Stopwatch stopwatch = new Stopwatch();
                stopwatch.Start();
                await _next.Invoke(context);
                stopwatch.Stop();
                Console.WriteLine($"请求地址：{context.Request.Path}；请求相应时间：{stopwatch.ElapsedMilliseconds}ms");
                if (context.Response.StatusCode == (int)StatusCodes.Status404NotFound)
                {
                    var resultError = JsonConvert.SerializeObject(new { Ok=false,Data="action not found"});
                    await context.Response.WriteAsync(resultError);
                }
            }
            catch (Exception ex)
            {

            }
        }

 

public class RequestLoggerMiddleware
    {
        private readonly RequestDelegate _next;
        public RequestLoggerMiddleware(RequestDelegate next)
        {
            _next = next;
        }
        public async Task Invoke(HttpContext context)
        {
            try
            {
                Stopwatch stopwatch = new Stopwatch();
                stopwatch.Start();
                await _next.Invoke(context);
                stopwatch.Stop();
                Console.WriteLine($"请求地址：{context.Request.Path}；请求相应时间：{stopwatch.ElapsedMilliseconds}ms");
            }
            catch (Exception ex)
            {

            }
        }
    }

 

2、

public static class MiddlewareExtensions
    {
        public static IApplicationBuilder RequestLogger(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<RequestLoggerMiddleware>();
        }
    }

 

3、使用中间件，一定要放在AddMvc之前，否则不起作用

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            AppDependencyResolver.Init(app.ApplicationServices);
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseHsts();
            }
            // Add management endpoints into pipeline
            app.UseCloudFoundryActuators();
            app.UseLoggersActuator();

            app.RequestLogger();
            app.UseHttpsRedirection();
            app.UseMvc();
}