asp.net-core 1.1中返回空体的异常筛选器

Question

下面的异常筛选器将异常重定向到我的特定错误页面。

    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, AllowMultiple = false)]
public class FrontofficeControllerExceptionFilterAttribute : ExceptionFilterAttribute
{
    protected readonly ILogger<FrontofficeController> _logger;
    protected readonly IHostingEnvironment _hostingEnvironment;
    protected readonly IModelMetadataProvider _modelMetadataProvider;

    public FrontofficeControllerExceptionFilterAttribute(ILogger<FrontofficeController> logger, IHostingEnvironment hostingEnvironment, IModelMetadataProvider modelMetadataProvider)
    {
        _logger = logger;
        _hostingEnvironment = hostingEnvironment;
        _modelMetadataProvider = modelMetadataProvider;
    }

    public override void OnException(ExceptionContext context)
    {
        if (context.ExceptionHandled) return;

        Exception ex = context.Exception;
        var result = new ViewResult { ViewName = "ApplicationError" };

        context.ExceptionHandled = true; // mark exception as handled
        context.Result = result;
    }
}

将我的web应用程序迁移到asp.net Core1.1后，结果是一个空白页面:响应的正文为空，Content-Length为零。这是在客户端上收到的响应

HTTP/1.1 200 OK
Server: Kestrel
X-SourceFiles: =?UTF-8?B?QzpcUHJvamVjdHNcaW50ZXJhaC52aXN1YWxzdHVkaW8uY29tXEludmVudGFyaW9cTWFpblxTb3VyY2VcRnJvbnRvZmZpY2Vcc3JjXEZyb250b2ZmaWNl?=
X-Powered-By: ASP.NET
Date: Wed, 30 Nov 2016 14:49:53 GMT
Content-Length: 0

有没有人遇到过类似的问题?为什么？感谢您的评论

Answer 1

该行为得到了github aspnet/mvc团队的确认。https://github.com/aspnet/Mvc/issues/5594#issuecomment-265866653

目前，唯一的解决方案是直接呈现HTML响应。在这种情况下，将ExceptionHandled = true标记为true的效果与预期一致。

    public override void OnException(ExceptionContext context)
    {
        context.ExceptionHandled = true; // mark exception as handled
        context.HttpContext.Response.Clear();
        context.HttpContext.Response.StatusCode = 400;
        context.HttpContext.Response.ContentType = new MediaTypeHeaderValue("text/html").ToString();
        var home = string.Format("{0}://{1}", context.HttpContext.Request.Scheme,context.HttpContext.Request.Host);
        var htmlString ="<h2>SI E' VERIFICATO UN ERRORE INATTESO</h><br/><br/>";
        context.HttpContext.Response.WriteAsync(htmlString, Encoding.UTF8);
    }