Question

我正在使用框架4.5创建一个在Visual Studio 2013中使用restful POST方法的方法。这是windows_phone_8（针对Phone OS 8.0）应用程序。这是我的代码。

static string HttpPost(string url, string[] paramName, string[] paramVal)
        {
            HttpWebRequest req = WebRequest.Create(new Uri(url))
                                 as HttpWebRequest;
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";

            // Build a string with all the params, properly encoded.
            // We assume that the arrays paramName and paramVal are
            // of equal length:
            StringBuilder paramz = new StringBuilder();
            for (int i = 0; i < paramName.Length; i++)
            {
                paramz.Append(paramName[i]);
                paramz.Append("=");
                paramz.Append(HttpUtility.UrlEncode(paramVal[i]));
                paramz.Append("&");
            }

            // Encode the parameters as form data:
            byte[] formData =
                UTF8Encoding.UTF8.GetBytes(paramz.ToString());
            req.ContentLength = formData.Length;

            // Send the request:
            using (Stream post = req.GetRequestStream())
            {
                post.Write(formData, 0, formData.Length);
            }

            // Pick up the response:
            string result = null;
            using (HttpWebResponse resp = req.GetResponse()
                                          as HttpWebResponse)
            {
                StreamReader reader =
                    new StreamReader(resp.GetResponseStream());
                result = reader.ReadToEnd();
            }

            return result;
        }

此方法在Windows Phone 8应用程序中有两个构建错误，但在Windows应用程序中工作正常。

错误1＆＃39; System.Net.HttpWebRequest＆＃39;不包含的定义＆＃39; GetRequestStream＆＃39;没有扩展方法＆＃39; GetRequestStream＆＃39; 接受类型为＃System; Net.Net.HttpWebRequest＆＃39;的第一个参数。可以找到（你错过了使用指令或汇编引用吗？）
Error 2 'System.Net.HttpWebRequest' does not contain a definition for 'GetResponse' and no extension method 'GetResponse' accepting a
类型＆＃39; System.Net.HttpWebRequest＆＃39;的第一个参数可以找到（是你错过了使用指令或程序集引用？）

答案：

我可以通过更改代码来解决它......

static async Task<string> HttpPost(string url, string[] paramName, string[] paramVal)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(url));
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";

            // Build a string with all the params, properly encoded.
            // We assume that the arrays paramName and paramVal are
            // of equal length:
            StringBuilder paramz = new StringBuilder();
            for (int i = 0; i < paramName.Length; i++)
            {
                paramz.Append(paramName[i]);
                paramz.Append("=");
                paramz.Append(HttpUtility.UrlEncode(paramVal[i]));
                paramz.Append("&");
            }

            // Encode the parameters as form data:
            byte[] formData =
                UTF8Encoding.UTF8.GetBytes(paramz.ToString());
            request.ContentLength = formData.Length;

            using (var stream = await Task.Factory.FromAsync<Stream>(request.BeginGetRequestStream, request.EndGetRequestStream, null))
            {
                stream.Write(formData, 0, formData.Length);
            }

            // Pick up the response:
            string result = null;
            using (var response = (HttpWebResponse)(await Task<WebResponse>.Factory.FromAsync(request.BeginGetResponse, request.EndGetResponse, null)))
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                result = reader.ReadToEnd();
            }

            return result;
        }

呼叫部分就像

private async void btn_Login_Click(object sender, RoutedEventArgs e)
        {                       
                var response = await HttpPost(url, paramName, paramVal);
        }

由于塞巴斯蒂安

＆＃39; System.Net.HttpWebRequest＆＃39;不包含＆＃39; GetRequestStream＆＃39;的定义

0 个答案: