.net APIHelper client获取数据

using Newtonsoft.Json;
using System.Net.Http.Headers;

    public static class APIHepler
    {
        public static string Get(string url)
        {
            HttpClient client = new HttpClient();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            return client.GetAsync(url).Result.Content.ReadAsStringAsync().Result;
        }

        public static string Post(string url, object data)
        {
            HttpContent httpContent = new StringContent(JsonConvert.SerializeObject(data));
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            HttpClient client = new HttpClient();

            return client.PostAsync(url, httpContent).Result.Content.ReadAsStringAsync().Result;
        }

        public static string Get(string httpUrl, ref List<string> msg, string source)
        {
            string strRet = string.Empty;
            try
            {
                using (var client = new HttpClient())
                {
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                    HttpResponseMessage response = client.GetAsync(httpUrl).Result;
                    if (response.IsSuccessStatusCode)
                    {
                        strRet = response.Content.ReadAsStringAsync().Result;
                    }
                }
            }
            catch (Exception ex)
            {
                strRet = string.Empty;
                //日志记录
            }
            return strRet;
        }
        public static string Post(string httpUrl, string requestJson, ref List<string> msg, string source)
        {
            string strRet = string.Empty;
            try
            {
                using (var client = new HttpClient())
                {
                    HttpContent httpContent = new StringContent(requestJson);
                    httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                    HttpResponseMessage response = client.PostAsync(httpUrl, httpContent).Result;
                    if (response.IsSuccessStatusCode)
                    {
                        strRet = response.Content.ReadAsStringAsync().Result;
                    }
                }
            }
            catch (Exception ex)
            {
                strRet = string.Empty;
                //日志记录
            }
            return strRet;
        }
    }