用__postback传递JavaScript变量到c#（pass a js variable to C# by a _

本文深入探讨了ASP.NET中的PostBack机制，详细介绍了如何通过__doPostBack触发服务器端回传事件，实现页面与服务器之间的非刷新数据交互。文章提供了一个具体的示例，包括客户端JavaScript初始化函数及服务器端事件处理逻辑。

之前发过用POST方式的http://www.cnblogs.com/blodfox777/articles/1271912.html

而用__postback比较高阶，代码出自NC01

private void Page_Load( object sender, System.EventArgs e)
{
// Insure that the __doPostBack() JavaScript method is created

this .GetPostBackEventReference( this , string .Empty);

if ( this .IsPostBack )
{
   string eventTarget = ( this .Request[ " __EVENTTARGET " ] == null ) ? string .Empty : this .Request[ " __EVENTTARGET " ];
   string eventArgument = ( this .Request[ " __EVENTARGUMENT " ] == null ) ? string .Empty : this .Request[ " __EVENTARGUMENT " ];

   if ( eventTarget == " initializeServerSidePostBack " )
  {
    string valueSent = eventArgument;
  }
}
else
{
  ClientScript.RegisterStartupScript(GetType(Page), " initializeServerSideScript " , " initializeServerSide(); " , true )
}
}