C# 如何在 Web API 中抛出异常？
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How to throw exception in Web API?
提问by Alvin
How can I throw a exception to in ASP.net Web Api?
如何在 ASP.net Web Api 中抛出异常？
Below is my code:
下面是我的代码：
public Test GetTestId(string id)
{
Test test = _test.GetTest(id);
if (test == null)
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
return test;
}
I don't think I am doing the right thing, How do my client know it is a HTTP 404error?
我不认为我在做正确的事情，我的客户怎么知道这是一个HTTP 404错误？
采纳答案by Filip W
It's absolutely fine.
绝对没问题。
Alternatively, if you wish to provide more info (to allow, as you say, the client to distinguish from regular 404):
或者，如果您希望提供更多信息（如您所说，允许客户端与常规 404 区分开来）：
if (test == null)
{
throw new HttpResponseException(Request.CreateErrorResponse(HttpStatusCode.NotFound,
"this item does not exist"));
}
回答by Youssef Moussaoui
This should help you understand WebAPI error handling a bit better:
这应该可以帮助您更好地理解 WebAPI 错误处理：
http://blogs.msdn.com/b/youssefm/archive/2012/06/28/error-handling-in-asp-net-webapi.aspx
http://blogs.msdn.com/b/youssefm/archive/2012/06/28/error-handling-in-asp-net-webapi.aspx
What you have in your code snippet should work. The server will send back a 404 Not Found to the client if test is null with no response body. If you want a response body, you should consider using Request.CreateErrorResponse as explained in the blog post above and passing that response to the HttpResponseException.
您的代码片段中的内容应该可以工作。如果测试为空且没有响应正文，服务器将向客户端发回 404 Not Found。如果您想要一个响应正文，您应该考虑使用 Request.CreateErrorResponse，如上面博客文章中所述，并将该响应传递给 HttpResponseException。
