使用HttpClient Post 時提示 Unsupported Media Type

項目的服務端是個API，當客戶端調用Post新增一條記錄請求時遇到Unsupported Media Type.

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

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

 詳細異常信息如下：

給client加上各種可能的header后測試依然報錯，仔細查看異常消息“request entity‘s media type...”, 難道是跟我Post過去的對象有關？

            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/");

 打斷點調試

果真如此，解決方法：

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

搞定~