Question

我有这个方法

[HttpPost]
public ContactModel Contact() 
{
// validation contact must have at least first name
 if (contactModel.firstName == null)
    return null;                           // This works fine

 /*
 if (contactModel.firstName == null)
    return Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Please provide first name");                 // it gives error


// insert to database
}

那么，我如何指示用户至少提供名字。我想为回复添加一些标题，但这不是用户友好的。

我还添加了

if (contactModel.firstName == null) 
{
    Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Please provide first name");          // this doesn't do any good either.
    return null;                           // This works fine
}

Answer 1

CreateErrorResponse返回HttpResponseMessage，无法转换为ContactModel。您想要抛出HttpResponseException并使用CreateErrorResponse

添加错误

throw new HttpResponseException(Request.CreateErrorResponse(HttpStatusCode.BadRequest, 
    "Please provide first name"));

这将返回带有以下json的HTTP 400（错误请求）：

{"Message":"Please provide first name"}

如何从MVC Web API返回返回模型的错误消息？

1 个答案: