.net core web api - 控制器可以将参数传递给中间件吗？

Question

您好，我需要捕获 http 请求的异常，例如：

    [HttpPost("Test")]
    public async Task<ActionResult<TestResponse>> Test(TestRequest request)
    {
        TestResponse result;
        try
        {
           // call 3rd party service
        }
        catch(exception ex)
        {
          result.Errorcode = "Mock" // This Errorcode will be used by client side
        }

        return Ok(result);
    }

现在http请求比较多，想用一个中间件来全局处理异常，而不是
如上所述在每个http请求中编写try-catch语句。

public class Middleware
{
    readonly RequestDelegate next;

    public Middleware(RequestDelegate next)
    {
        this.next = next;
    }

    public async Task InvokeAsync(HttpContext httpContext)
    {
        try
        {
            await next(httpContext);
        }
        catch (Exception ex)
        {
            // is there a way to pass TestResponse here so I can do  result.Errorcode = "Mock"?
        }
    }
}

我不知道如何使用上面注释的中间件方法分配错误代码。可能吗？谢谢

Answer 1

如果我很了解您的要求，我建议这样做：

您不需要访问 TestResponse，您可以在中间件中配置您的响应。

public class FailResponseModel
{
    public FailResponseModel(string errorCode, object errorDetails)
    {
        ErrorCode = errorCode;
        ErrorDetails = errorDetails;
    }

    public string ErrorCode { get; set; }

    public object ErrorDetails { get; set; }
}

public class ExceptionHandlerMiddleware
{
    readonly RequestDelegate next;

    public Middleware(RequestDelegate next)
    {
        this.next = next;
    }

    public async Task InvokeAsync(HttpContext httpContext)
    {
        try
        {
            await next(httpContext);
        }
        catch (Exception ex)
        {
            httpContext.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
            httpContext.Response.ContentType = "application/json";
            var response =
                JsonConvert.SerializeObject(new FailResponseModel("your-error-code", "your-error-details"));

            await httpContext.Response.WriteAsync(response);
        }
    }
}

.net core web api - 控制器可以将参数传递给中间件吗？

.net core web api - Can controller pass parameters to middleware?

c#

error-handling

middleware

asp.net-web-api