C#调用WebService时和JS调用时有很多相似的地方，让我们来一步一步实现：
第一步：创建一个WebService
这一步和JS调用WebService相同，在此不多说了。详细可访问如下地址：
地址：http://www.cnblogs.com/puresoul/archive/2010/08/19/1803567.html
第二步：创建一个页面，实现C＃调用Web服务
在页面上添加一个按钮，后台代码如下：
代码
1
using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Web;
5 using System.Web.UI;
6 using System.Web.UI.WebControls;
7
8 using MSXML2;
9
10 public partial class Default4 : System.Web.UI.Page
11 {
12 protected void Page_Load(object sender, EventArgs e)
13 {
14
15 }
16 protected void Button1_Click(object sender, EventArgs e)
17 {
18 // Web服务的地址
19 string URL = " http://localhost/YBWS/WebService.asmx " ;
20
21 // 拼接数据
22 string data;
23 data = " <?xml version=\ " 1.0 \ " encoding=\ " utf - 8 \ " ?> " ;
24 data = data + " <soap12:Envelope xmlns:xsi=\ " http: // www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap12=\"http://www.w3.org/2003/05/soap-envelope\">";
25 data = data + " <soap12:Body> " ;
26 data = data + " <HelloWorld xmlns=\ " http: // tempuri.org/\" />";
27 data = data + " </soap12:Body> " ;
28 data = data + " </soap12:Envelope> " ;
29
30 // 创建异步对象(XMLHTTP对象在MSXML2下)
31 XMLHTTP xmlhttp = new XMLHTTP();
32 xmlhttp.open( " POST " , URL, false , null , null );
33 xmlhttp.setRequestHeader( " Content-Type " , " application/soap+xml " );
34 xmlhttp.send(data);
35 Response.Write(System.Text.Encoding.UTF8.GetString(( byte [])xmlhttp.responseBody));
36 Response.End();
37 }
38 }
39
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Web;
5 using System.Web.UI;
6 using System.Web.UI.WebControls;
7
8 using MSXML2;
9
10 public partial class Default4 : System.Web.UI.Page
11 {
12 protected void Page_Load(object sender, EventArgs e)
13 {
14
15 }
16 protected void Button1_Click(object sender, EventArgs e)
17 {
18 // Web服务的地址
19 string URL = " http://localhost/YBWS/WebService.asmx " ;
20
21 // 拼接数据
22 string data;
23 data = " <?xml version=\ " 1.0 \ " encoding=\ " utf - 8 \ " ?> " ;
24 data = data + " <soap12:Envelope xmlns:xsi=\ " http: // www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap12=\"http://www.w3.org/2003/05/soap-envelope\">";
25 data = data + " <soap12:Body> " ;
26 data = data + " <HelloWorld xmlns=\ " http: // tempuri.org/\" />";
27 data = data + " </soap12:Body> " ;
28 data = data + " </soap12:Envelope> " ;
29
30 // 创建异步对象(XMLHTTP对象在MSXML2下)
31 XMLHTTP xmlhttp = new XMLHTTP();
32 xmlhttp.open( " POST " , URL, false , null , null );
33 xmlhttp.setRequestHeader( " Content-Type " , " application/soap+xml " );
34 xmlhttp.send(data);
35 Response.Write(System.Text.Encoding.UTF8.GetString(( byte [])xmlhttp.responseBody));
36 Response.End();
37 }
38 }
39
当点击按钮时，效果如下图：
