asp.net - 如何在 WPF 4.0 中调用 Web API

Question

我想在我的 WPF 4.0 应用程序中调用 Web API，其中 API 以 JSON 格式接收请求并以 JSON 格式发送响应。

我从这里得到了在 WPF 4.5 中调用 Web API的解决方案http://www.asp.net/web-api/overview/web-api-clients/calling-a-web-api-from-a-wpf-application

但我想要 WPF 4.0 中的同一种解决方案

请帮我

Answer 1

您必须安装 NuGet 包管理器和 Http 客户端库。这应该工作： http: //www.codeproject.com/Articles/611176/CallingplusASP-NetplusWebAPIplususingplusHttpClien

Answer 2

 public  T CallWebAPi<T>(string userName, string password, Uri url, out bool isSuccessStatusCode)
        {
            T result = default(T);

            using (HttpClient client = new HttpClient())
            {
                client.BaseAddress = url;
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(
                    System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", userName, password))));

                HttpResponseMessage response = client.GetAsync(url).Result;
                isSuccessStatusCode = response.IsSuccessStatusCode;
                var JavaScriptSerializer = new JavaScriptSerializer();
                if (isSuccessStatusCode)
                {
                    var dataobj = response.Content.ReadAsStringAsync();
                    result = JavaScriptSerializer.Deserialize<T>(dataobj.Result);
                }
                else if (Convert.ToString(response.StatusCode) != "InternalServerError")
                {
                    result = JavaScriptSerializer.Deserialize<T>("{ \"APIMessage\":\"" + response.ReasonPhrase + "\" }");
                }
                else
                {
                    result = JavaScriptSerializer.Deserialize<T>("{ \"APIMessage\":\"InternalServerError\" }");
                }
            }
            return result;
        }