如何在WinForm中发送HTTP请求

手工发送HTTP请求主要是调用 System.Net的HttpWebResponse方法

手工发送HTTP的GET请 求:

C# code

    
    
    
    

     
     
     
     string
     
     
     
      strURL 
     
     
     
     =
     
     
     
      
     
     
     
     "
     
     
     
     http://localhost/Play/CH1/Service1.asmx/doSearch?keyword=
     
     
     
     "
     
     
     
     ; strURL 
     
     
     
     +=
     
     
     
     this
     
     
     
     .textBox1.Text; System.Net.HttpWebRequest request; 
     
     
     
     //
     
     
     
      创建一个HTTP请求
     
     
     
      
     
     
     
     request 
     
     
     
     =
     
     
     
      (System.Net.HttpWebRequest)WebRequest.Create(strURL); 
     
     
     
     //
     
     
     
     request.Method="get";
     
     
     
      
     
     
     
     System.Net.HttpWebResponse response; response 
     
     
     
     =
     
     
     
      (System.Net.HttpWebResponse)request.GetResponse(); System.IO.Stream s; s 
     
     
     
     =
     
     
     
      response.GetResponseStream(); XmlTextReader Reader 
     
     
     
     =
     
     
     
      
     
     
     
     new
     
     
     
      XmlTextReader(s); Reader.MoveToContent(); 
     
     
     
     string
     
     
     
      strValue 
     
     
     
     =
     
     
     
      Reader.ReadInnerXml(); strValue 
     
     
     
     =
     
     
     
      strValue.Replace(
     
     
     
     "
     
     
     
     <
     
     
     
     "
     
     
     
     ,
     
     
     
     "
     
     
     
     <
     
     
     
     "
     
     
     
     ); strValue 
     
     
     
     =
     
     
     
      strValue.Replace(
     
     
     
     "
     
     
     
     &gt;
     
     
     
     "
     
     
     
     ,
     
     
     
     "
     
     
     
     >
     
     
     
     "
     
     
     
     ); MessageBox.Show(strValue); Reader.Close();
    
    
    
    

手工发送HTTP的POST请求

C# code

string strURL = "http://localhost/Play/CH1/Service1.asmx/doSearch";
System.Net.HttpWebRequest request;

request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
//Post请求方式
request.Method="POST";
// 内容类型
request.ContentType="application/x-www-form-urlencoded";
// 参数经过URL编码
string paraUrlCoded = System.Web.HttpUtility.UrlEncode("keyword");
paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(this.textBox1.Text);
byte[] payload;
//将URL编码后的字符串转化为字节
payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
//设置请求的 ContentLength 
request.ContentLength = payload.Length;
//获得请 求流
Stream writer = request.GetRequestStream();
//将请求参数写入流
writer.Write(payload,0,payload.Length);
// 关闭请求流
writer.Close();
System.Net.HttpWebResponse response;
// 获得响应流
response = (System.Net.HttpWebResponse)request.GetResponse();
System.IO.Stream s;
s = response.GetResponseStream();
XmlTextReader Reader = new XmlTextReader(s);
Reader.MoveToContent();
string strValue = Reader.ReadInnerXml();
strValue = strValue.Replace("&lt;","<");
strValue = strValue.Replace("&gt;",">");
MessageBox.Show(strValue); 
Reader.Close();