对于从Web API 2控制器返回,如果响应是OK(状态200),我可以返回内容与响应:

public IHttpActionResult Get()
{
    string myResult = ...
    return Ok(myResult);
}

如果可能的话,我希望在这里尽可能使用内置结果类型

我的问题是,对于另一种类型的响应(不是200),我如何用它返回消息(字符串)?例如,我可以这样做:

public IHttpActionResult Get()
{
    return InternalServerError();
}

但这不是:

public IHttpActionResult Get()
{
    return InternalServerError("Message describing the error here");
}

理想情况下,我希望这是一般化的,这样我就可以用IHttpActionResult的任何实现发送回消息。

我需要这样做(并建立我的响应消息):

public IHttpActionResult Get()
{
    HttpResponseMessage responseMessage = ...;
    return ResponseMessage(responseMessage);
}

还是有更好的办法?


当前回答

简单:

return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "Your message"));

记住引用System.Net.Http和System.Net。

其他回答

对于例外情况,我通常会这样做

 catch (Exception ex)
        {
            return InternalServerError(new ApplicationException("Something went wrong in this request. internal exception: " + ex.Message));
        }

我最终采用了以下解决方案:

public class HttpActionResult : IHttpActionResult
{
    private readonly string _message;
    private readonly HttpStatusCode _statusCode;

    public HttpActionResult(HttpStatusCode statusCode, string message)
    {
        _statusCode = statusCode;
        _message = message;
    }

    public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
    {
        HttpResponseMessage response = new HttpResponseMessage(_statusCode)
        {
            Content = new StringContent(_message)
        };
        return Task.FromResult(response);
    }
}

... 可以这样使用:

public IHttpActionResult Get()
{
   return new HttpActionResult(HttpStatusCode.InternalServerError, "error message"); // can use any HTTP status code
}

我愿意接受改进建议。:)

我建议你阅读这篇文章。有很多方法可以使用现有的HttpResponse,但是如果您想利用Web Api 2,那么可以考虑使用一些内置的IHttpActionResult选项,例如

return Ok() 

or

return NotFound()

为Web Api控制器选择正确的返回类型

抱歉回答晚了为什么不简单使用

return BadRequest("your message");

我使用它为我所有的IHttpActionResult错误它工作得很好

以下是文档:https://msdn.microsoft.com/en-us/library/system.web.http.apicontroller.badrequest(v=vs.118).aspx

@mayabelle你可以创建IHttpActionResult具体和包装这些代码像这样:

public class NotFoundPlainTextActionResult : IHttpActionResult
{
    public NotFoundPlainTextActionResult(HttpRequestMessage request, string message)
    {
        Request = request;
        Message = message;
    }

    public string Message { get; private set; }
    public HttpRequestMessage Request { get; private set; }

    public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
    {
        return Task.FromResult(ExecuteResult());
    }

    public HttpResponseMessage ExecuteResult()
    {
        var response = new HttpResponseMessage();

        if (!string.IsNullOrWhiteSpace(Message))
            //response.Content = new StringContent(Message);
            response = Request.CreateErrorResponse(HttpStatusCode.NotFound, new Exception(Message));

        response.RequestMessage = Request;
        return response;
    }
}