C# 错误处理中间件捕获永远不会被捕获

我有一个ErrorHandlingMiddleware，看起来像这样：

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 statusCode = (int)HttpStatusCode.InternalServerError;

        if (ex is NotFoundError) statusCode = (int)HttpStatusCode.NotFound;
        //else if (ex is MyUnauthorizedException) code = HttpStatusCode.Unauthorized;
        //else if (ex is MyException) code = HttpStatusCode.BadRequest;

        var error = new AttemptError(statusCode, ex.Message, ex);

        context.Response.ContentType = "application/json";
        context.Response.StatusCode = statusCode;

        return context.Response.WriteAsync(error.ToString());
    }
}

services.AddControllers(options => options.Filters.Add(new HttpResponseExceptionFilter()));

我已将此添加到我的初创公司课程中：

public void Configure(IApplicationBuilder app)
{
    app.UseMiddleware<ErrorHandlingMiddleware>();
    app.SeedIdentityServerDatabase();
    app.UseDeveloperExceptionPage();

    app.UseIdentityServer();
    app.UseSwagger();
    app.UseSwaggerUI(c =>
    {
        c.SwaggerEndpoint("/swagger/v1/swagger.json", "r3plica Identity Server v1");
        c.OAuthClientId("swagger");
        c.OAuthAppName("Swagger Api UI");
    });
    app.UseMvc();
}

因此，我设置了一个测试：

throw new Exception();

它被扔到我的控制器里。当我运行我的应用程序，然后调用抛出该异常的端点时，它确实会进入我的

ErrorHandlingMiddleware

的

Invoke

方法，但它不会捕获异常，而是进入

wait\u next（context）

---

有人知道我做错了什么吗？

如果您在

app.usedeveloperceptionpage（）之后调用它，那么您的中间件将正常工作启动中编码>

说

将对UsedeveloperCeptionPage的调用放在要捕获异常的任何中间件之前

我通过创建一个过滤器解决了这个问题：

public class HttpResponseExceptionFilter : IActionFilter, IOrderedFilter
{
    public int Order { get; set; } = int.MaxValue - 10;

    public void OnActionExecuting(ActionExecutingContext context) { }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        if (context.Exception == null) return;

        var attempt = Attempt<string>.Fail(context.Exception);

        if (context.Exception is AttemptException exception)
        {
            context.Result = new ObjectResult(attempt)
            {
                StatusCode = exception.StatusCode,
            };
        }
        else
        {
            context.Result = new ObjectResult(attempt)
            {
                StatusCode = (int)HttpStatusCode.InternalServerError,
            };
        }

        context.ExceptionHandled = true;
    }
}

我不确定错误处理程序的注册是否正确。我注册了我的中间件，就像这个应用一样。使用中间件（typeof（ErrorHandlingMiddleware））；。也许你的注册也是正确的。
services.AddControllers(options => options.Filters.Add(new HttpResponseExceptionFilter()));