HttpWebRequest发送post请求时有多个参数如何处理？

[y2012]

在网上找了一段winform中发送post请求的代码，但是我要post的参数有多个，我试了下用&，|连接都出错。报远程服务器返回错误:(400)错误的请求。
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

//这是原始代码：
string paraUrlCoded = System.Web.HttpUtility.UrlEncode("keyword");
paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(this.textBox1.Text);


//这是我的代码：
string paraUrlCoded = System.Web.HttpUtility.UrlEncode("userCode");
paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(this.textBox1.Text);
paraUrlCoded ="&"+ System.Web.HttpUtility.UrlEncode("userName");
paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(this.textBox2.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("<","<");
strValue = strValue.Replace(">",">");
MessageBox.Show(strValue);
Reader.Close();

[rayyu1989]

http://msdn.microsoft.com/zh-cn/library/system.net.webclient.uploadstring(v=vs.80).aspx

WebClient.UploadString 可以满足你的要求

UploadStringAsync为异步请求

[蝶恋花雨]

//这是我的代码：
byte[] payload;
StringBuilder sb = new StringBuilder();
sb.Append("&userCode="+this.textBox1.Text);
sb.Append("&userName="+this.textBox2.Text);
//将URL编码后的字符串转化为字节
payload = System.Text.Encoding.UTF8.GetBytes(sb.ToString());
//设置请求的 ContentLength
request.ContentLength = payload.Length;
//设置请求的 ContentLength 这中间的代码换成我的。
这样就没问题了。

[蝶恋花雨]

//这是我的代码：

byte[] payload;
StringBuilder sb = new StringBuilder();
sb.Append("&userCode="+this.textBox1.Text);
sb.Append("&userName="+this.textBox2.Text);
//将URL编码后的字符串转化为字节
payload = System.Text.Encoding.UTF8.GetBytes(sb.ToString());

//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("<","<");
strValue = strValue.Replace(">",">");
MessageBox.Show(strValue);
Reader.Close();

标红色 的

[y2012]

[Quote=引用 3 楼 的回复:]
//这是我的代码：

byte[] payload;
StringBuilder sb = new StringBuilder();
sb.Append("&userCode="+this.textBox1.Text);
sb.Append("&userName="+this.textBox2.Text);
//将URL编码后的字符串转化为字节
payload = S……
[/Quote]
每个参数前面都加&?

[孟子E章]

是的，格式是
string data = "param1=x1¶m2=x2¶m3=x3¶m4=x5¶m6=x7"

[y2012]

[Quote=引用 5 楼 的回复:]
是的，格式是
string data = "param1=x1&param2=x2&param3=x3&param4=x5&param6=x7"
[/Quote]
第一个参数param1前面是不是也要加&，我就是像你这样写的，结果报错了。

[孟子E章]

param1是不需要加的
结果报错，可能是提供的参数或者编码格式还是不正确

注意参数名称要完全一样

[孟子E章]

下面是我做的一个测试，你可以完全拷贝下来进行测试

asmx代码

<%@ WebService Language="C#" Class="Service1" %>

using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
//若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。 
// [System.Web.Script.Services.ScriptService]
public class Service1  : System.Web.Services.WebService {

    [WebMethod]
  public string doSearch(String p1,String p2,String p3)
  {
        return "Hello World" + p1 + p2 + p3;
    }    
}

winform代码

    private void button1_Click(object sender, EventArgs e)
    {
      string strURL = "http://localhost:2852/WebSite1/Service1.asmx/doSearch";
      System.Net.HttpWebRequest request;
      request = (System.Net.HttpWebRequest)HttpWebRequest.Create(strURL);
      //Post请求方式
      request.Method = "POST";
      // 内容类型
      request.ContentType = "application/x-www-form-urlencoded";
 
      //这是原始代码：
      string paraUrlCoded = "p1=x&p2=y&p3=测试的中文";
      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();
      XmlDocument d = new XmlDocument();
      d.Load(s);
      MessageBox.Show(d.DocumentElement.InnerText);

    }

[孟子E章]

测试编码问题

private void button1_Click(object sender, EventArgs e)
{
  //测试编码问题
  string p1 = "测试的代码<啊啊啊>";
  string p2 = "\"'===&&";
  string p3 = "??";
    
  string strURL = "http://localhost:2852/WebSite1/Service1.asmx/doSearch";
  System.Net.HttpWebRequest request;
  request = (System.Net.HttpWebRequest)HttpWebRequest.Create(strURL);
  //Post请求方式
  request.Method = "POST";
  // 内容类型
  request.ContentType = "application/x-www-form-urlencoded";
 
  //这是原始代码：
  string paraUrlCoded = "p1=" + Uri.EscapeDataString(p1) + "&p2=" + Uri.EscapeDataString(p2) + "&p3=" + Uri.EscapeDataString(p3);
  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();
  XmlDocument d = new XmlDocument();
  d.Load(s);
  MessageBox.Show(d.DocumentElement.InnerText);

}

[lylisheng]

对我这个新手,非常的有帮助,希望以后还能提供一些这样经典的指导给我们,让我们一同成长和进步.谢了!

[Inkheart_ly]

留名回头来看

[jk19910410]

留名回头来看

[西南黑少]

楼上的winform代码的列子可行