Configure、中间件与ErrorHandlingMiddleware全局异常捕获

 public class ErrorHandlingMiddleware
    {
        private readonly RequestDelegate next;
        public ErrorHandlingMiddleware(RequestDelegate next)
        {
            this.next = next;
        }
        public async Task Invoke(HttpContext context /* other dependencies */)
        {
            try
            {
                await next(context);
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(context, ex);
            }
           
        }
        private static Task HandleExceptionAsync(HttpContext context, Exception ex)
        {
            var code = HttpStatusCode.InternalServerError; // 500 if unexpected
            var Info = "";
            switch (context.Response.StatusCode)
            {
                case 401:
                    Info = "没有权限";
                    break;
                case 404:
                    Info = "未找到服务";
                    break;
                case 403:
                    Info = "服务器理解请求客户端的请求，但是拒绝执行此请求";
                    break;
                case 500:
                    Info = "服务器内部错误，无法完成请求";
                    break;
                case 502:
                    Info = "请求错误";
                    break;
                default:
                    Info = "内部错误";
                    break;
            }
            LogHelp.Error(ex);
            var result = JsonConvert.SerializeObject(new { error = ex.Message });
            context.Response.ContentType = "application/json";
            context.Response.StatusCode = (int)code;
            return context.Response.WriteAsync(result);
        }
    }