WebApi傳遞JSON參數

開發過程當中常常進行JSON的傳遞，在WebApi中傳遞JSON字串時，會發現服務器端接收到不參數值，看下面代碼

服務端：

public void Post([FromBody]string value)
        {
            LoggerHelper.Info("Post:{0}", value);
        }

客戶端：

HttpClient client = new HttpClient();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            string url = "http://api.oa.com/api/Test/Post";

            var json = "{ \"Name\": \"Test\" }";
            var httpContent = new StringContent(json, Encoding.UTF8);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            var response = client.PostAsJsonAsync(url, httpContent).Result;
            if (!response.IsSuccessStatusCode)
            {
                Response.Write(string.Format("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase));
            }

運行客戶端，查看服務端的日誌，結果爲「Post:」，調用成功，但參數接收失敗。

查了些資料，顯示WebApi不支持JSON字串作爲簡單參數傳遞，既然如此就將JSON字串作爲複雜類型進行傳，對代碼稍作調整，服務端接收JObject參數：

public void Post([FromBody]JObject value)
        {
            
            LoggerHelper.Info("Post:{0}", value.ToString());
        }

客戶端：

HttpClient client = new HttpClient();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            string url = "http://api.oa.com/api/Test/Post";

            var json = "{ \"Name\": \"Test\" }";
            var jObject = JObject.Parse(json);
            var response = client.PostAsJsonAsync(url, jObject).Result;
            if (!response.IsSuccessStatusCode)
            {
                Response.Write(string.Format("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase));
            }

運行客戶端，再次查看服務端的日誌，結果爲：

Post:{
"Name": "Test"
}，參數傳遞成功