我也有同样的问题。我想为我的api控制器创建自定义结果，像这样调用它们 return Ok("some text");

然后我这样做了: 1)使用singletone创建自定义结果类型

public sealed class EmptyResult : IHttpActionResult
{
    public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
    {
        return Task.FromResult(new HttpResponseMessage(System.Net.HttpStatusCode.NoContent) { Content = new StringContent("Empty result") });
    }
}

2)使用new方法创建自定义控制器:

public class CustomApiController : ApiController
{
    public IHttpActionResult EmptyResult()
    {
        return new EmptyResult();
    }
}

然后我可以在我的控制器中调用它们，像这样:

public IHttpActionResult SomeMethod()
    {
       return EmptyResult();
    }

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));
        }

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

下面的代码/类确实有助于处理所有类型的响应。可能是成功或失败等。

为什么要用这个?：

假设我正在使用web API服务。输出有如下几种可能性:

由于验证错误，您可能得不到任何结果 你会得到预期的结果 你会得到错误。

So here I have solution to handle all the scenarios. Also I tried to maintain uniformity in the output. You can give remark or actual error message. The web service consumer can only check IsSuccess true or not else will sure there is problem, and act as per situation. There should be perfect communication between web API developer and web API consumer. If result is not generating then why. The comment or exception will acknowledge and they will act accordingly. Hence this is best solution for web API consumer / user.

对所有类型的结果进行单一响应。

  public class Response
    {
        /// <summary>
        /// Gets or sets a value indicating whether this instance is success.
        /// </summary>
        /// <value>
        /// <c>true</c> if this instance is success; otherwise, <c>false</c>.
        /// </value>
        public bool IsSuccess { get; set; } = false;
    
        /// <summary>
        /// Actual response if succeed 
        /// </summary>
        /// <value>
        /// Actual response if succeed 
        /// </value>
        public object Data { get; set; } = null;
    
        /// <summary>
        /// Remark if anythig to convey
        /// </summary>
        /// <value>
        /// Remark if anythig to convey
        /// </value>
        public string Remark { get; set; } = string.Empty;
        /// <summary>
        /// Gets or sets the error message.
        /// </summary>
        /// <value>
        /// The error message.
        /// </value>
        public object ErrorMessage { get; set; } = null;
    
       
    }  
    



[HttpGet]
        public IHttpActionResult Employees()
        {
            Response _res = new Response();
            try
            { 
                DalTest objDal = new DalTest(); 
                _res.Data = objDal.GetTestData();
                _res.IsSuccess = true;
                return Request.CreateResponse(HttpStatusCode.OK, _res);
            }
            catch (Exception ex)
            {
                _res.IsSuccess = false;
                _res.ErrorMessage = ex;
                return ResponseMessage(Request.CreateResponse(HttpStatusCode.InternalServerError, _res )); 
            } 
        }

如有任何建议，欢迎您提出:)

如果有人使用并从中受益，我很高兴。如果有任何增加或修改使这更完善，请在akhandagale65@gmail.com上写信给我。

你可以用这个:

return BadRequest("No data is present in table!!");

你可以用这个:

return Content(HttpStatusCode.BadRequest, "Any object");