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有時候難免會在項目中使用到web服務，可以利用vs生成web服務訪問代理。不過呢，我們在這兒使用HttpWebReqeust來訪問web服務，并訪問Cookie
我們以登錄操作為例：
1、提交登錄數(shù)據(jù)，并獲取Cookie
 System.Net.HttpWebRequest req = System.Net.HttpWebRequest.Create("web服務地址");
req.Method = "POST";
//req.ContentType = "application/x-www-form-urlencoded"
req.ContentType = "text/xml; charset=utf-8";
req.Headers.Add("SOAPAction", "\"http://www./Login\"");
req.CookieContainer = new System.Net.CookieContainer();
StringBuilder soap = new StringBuilder();
// 構建SOAP內容
soap.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
soap.AppendLine("<soap:Envelope xmlns:xsi=\"http://www./2001/XMLSchema-instance\" xmlns:xsd=\"http://www./2001/XMLSchema\" xmlns:soap=\"http://schemas./soap/envelope/\">");
soap.AppendLine(" <soap:Body>");
soap.AppendLine(" <Login xmlns=\"http://www./\">");
soap.AppendLine(" <username>用戶名</username>");
soap.AppendLine(" <password>密碼</password>");
soap.AppendLine(" </Login>");
soap.AppendLine(" </soap:Body>");
soap.AppendLine("</soap:Envelope>");
System.IO.StreamWriter reqStream = new System.IO.StreamWriter(req.GetRequestStream());
reqStream.Write(soap.ToString());
reqStream.Close();
System.Net.HttpWebResponse rep = req.GetResponse();
System.IO.StreamReader reader = new System.IO.StreamReader(rep.GetResponseStream());
//輸出返回的數(shù)據(jù)
TextBox1.Text = reader.ReadToEnd();
reader.Close();
rep.Close();
//獲取Cookie
System.Net.Cookie cookie = rep.Cookies("cookie名稱");
Response.Write(cookie.Value);
2、獲取登錄用戶信息（會話訪問），將Cookie發(fā)送回服務器端
System.Net.HttpWebRequest req = System.Net.HttpWebRequest.Create("http://www./webtools/webservice/web/youjuhuiservice.asmx");
req.Method = "POST";
req.ContentType = "text/xml; charset=utf-8";
req.Headers.Add("SOAPAction", "\"http://www./GetOnlineUser\"");
req.CookieContainer = new System.Net.CookieContainer();
System.Net.Cookie cookie = new System.Net.Cookie("cookie名稱", "cookie值");
cookie.Domain = "www.";
req.CookieContainer.Add(cookie);
StringBuilder soap = new StringBuilder();
// 構建SOAP內容
soap.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
soap.AppendLine("<soap:Envelope xmlns:xsi=\"http://www./2001/XMLSchema-instance\" xmlns:xsd=\"http://www./2001/XMLSchema\" xmlns:soap=\"http://schemas./soap/envelope/\">");
soap.AppendLine(" <soap:Body>");
soap.AppendLine(" <GetOnlineUser xmlns=\"http://www./\" />");
soap.AppendLine(" </soap:Body>");
soap.AppendLine("</soap:Envelope>");
System.IO.StreamWriter reqStream = new System.IO.StreamWriter(req.GetRequestStream());
reqStream.Write(soap.ToString());
reqStream.Close();
System.Net.HttpWebResponse rep = req.GetResponse();
System.IO.StreamReader reader = new System.IO.StreamReader(rep.GetResponseStream());
TextBox1.Text = reader.ReadToEnd();
reader.Close();
rep.Close();
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