asp.net webapi自定义输出结果类似Response.Write()

asp.net webapi自定义输出结果类似Response.Write()
[HttpGet]
public HttpResponseMessage HelloWorld()
{
string result = “Hello world! Time is: ” + DateTime.Now;
var resp = new HttpResponseMessage(HttpStatusCode.OK);
resp.Content = new StringContent(result, System.Text.Encoding.UTF8, “text/plain”);
return resp;
}