在没有做题目中所述的内容的时候,感觉这应该是很简单的东西,但是当真正开始做的时候却发现,有很多问题
现在在这里写出来,供和我一样水平不高的参考一下。
在写本文之前参照了一下文章
欢迎使用CSDN论坛阅读器 : CSDN Reader(附全部源代码) 最新版本:20070212
http://www.cnblogs.com/feiyun0112/archive/2006/09/20/509783.html
C#通过webRequest保持在同一Session中Post数据 http://blog.csdn.net/crabo/archive/2005/12/08/547092.aspx
c# 模拟Asp.net页面中的某个按钮的点击,向web服务器发出请求
主要就组织要提交的数据,然后以post方式提交。
假设我们有如下的网页
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用IE访问这个页面的时候可以得到如下的输出
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由上面的代码可以看出除了txtName,txtPwd以及两个按钮外,多出了两个__VIEWSTATE,__EVENTVALIDATION这四个表单需要提交到的,要模拟哪个按钮,在加上哪个按钮的表单的值就可以了,如:btnUpdate=Logon
在拼接提交的字符串的时候注意一下,用System.Web.HttpUtility.UrlEncode方法转换成Url编码的字符串。
下面是针对这个页面的btnUpdate按钮的提交数据
2 string __EVENTVALIDATION = "/wEWBQKcopufDgLEhISFCwKd+7qdDgLynailDAKT+PmaCJleqITXMfQuE9LK49YoxHV2oTzQ";
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4 __VIEWSTATE = System.Web.HttpUtility.UrlEncode(__VIEWSTATE);
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6 __EVENTVALIDATION = System.Web.HttpUtility.UrlEncode(__EVENTVALIDATION);
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8 string strPostData = String.Format("__VIEWSTATE={0}&txtName={1}&txtPwd={2}&btnUpdate=Longon&__EVENTVALIDATION={3}"
9 , __VIEWSTATE, this.txtName.Text, this.txtPassword.Text, __EVENTVALIDATION
10 );
然后创建一个HttpWebRequest对象,设置提交方式是post,然后把上面准备的字符串写进请求数据流里
基本上就可以了
如果有需要在访问不同页面时保存Session的话,需要设置HttpWebRequest对象的CookieContainer属性,保证每次设置的CookieContainer都是同一个对象就可以了。
下面是这个类就是向WEB页面发出请求,并得到返回数据的类
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使用方法如下
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