Set content when returning result in ExceptionFilterAttribute | The ASP.NET Forums

原文: Set content when returning result in ExceptionFilterAttribute | The ASP.NET Forums

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Rena Ni

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1910 Points

641 Posts

Re: Set content when returning result in ExceptionFilterAttribute

Oct 08, 2019 07:53 AM|Rena Ni|LINK

Hi b.dev,

You could change your code like below:

public class CustomExceptionFilterAttribute : ExceptionFilterAttribute
{
    public override void OnException(ExceptionContext context)
    {
            
        if (context.Exception is UnauthorizedAccessException)
        {
            var response = new HttpResponseMessage(HttpStatusCode.Unauthorized)
            {
                Content = new StringContent("Authorization exception while accessing ST."),
                ReasonPhrase = "User is not authorized. Please contact your administrator."
            };
            context.HttpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase = "User is not authorized. Please contact your administrator.";
            context.Result = new HttpResponseMessageResult(response);
            base.OnException(context);
        }
    }      
}
public class HttpResponseMessageResult : IActionResult
{
    private readonly HttpResponseMessage _responseMessage;

    public HttpResponseMessageResult(HttpResponseMessage responseMessage)
    {
        _responseMessage = responseMessage; // could add throw if null
    }

    public async Task ExecuteResultAsync(ActionContext context)
    {
        context.HttpContext.Response.StatusCode = (int)_responseMessage.StatusCode;
        using (var stream = await _responseMessage.Content.ReadAsStreamAsync())
        {
            await stream.CopyToAsync(context.HttpContext.Response.Body);
            await context.HttpContext.Response.Body.FlushAsync();
        }
    }
}

Result:

Best Regards,

Rena

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