有几种选择。最简单的方法是让您的方法返回
HttpResponseMessage，并
StringContent根据您的字符串使用来创建该响应，类似于下面的代码：
public HttpResponseMessage Get(){ string yourJson = GetJsonFromSomewhere(); var response = this.Request.CreateResponse(HttpStatusCode.OK); response.Content = new StringContent(yourJson, Encoding.UTF8, "application/json"); return response;}并检查null或空的JSON字符串
public HttpResponseMessage Get(){ string yourJson = GetJsonFromSomewhere(); if (!string.IsNullOrEmpty(yourJson)) { var response = this.Request.CreateResponse(HttpStatusCode.OK); response.Content = new StringContent(yourJson, Encoding.UTF8, "application/json"); return response; } throw new HttpResponseException(HttpStatusCode.NotFound);}
