使用HttpClient Post 时提示 Unsupported Media Type

项目的服务端是个API，当客户端调用Post新增一条记录请求时遇到Unsupported Media Type.

                var stringContent = new StringContent(JsonConvert.SerializeObject(PostResourceEntity));                

                HttpResponseMessage response = client.PostAsync("api/CallMe/", stringContent).Result;

 详细异常信息如下：

给client加上各种可能的header后测试依然报错，仔细查看异常消息“request entity‘s media type...”, 难道是跟我Post过去的对象有关？

            using (var client = new HttpClient())
            {
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                client.DefaultRequestHeaders.Add("Accept", "application/json");
                client.DefaultRequestHeaders.Add("ContentType", "application/json");
                client.BaseAddress = new Uri("http://localhost:65421/");

 打断点调试

果真如此，解决方法：

stringContent.Headers.ContentType = new MediaTypeWithQualityHeaderValue("application/json");

搞定~