Asp.net 如何获取回发邮件的来源

如果（第IsPostBack页） { //这里我需要知道哪个控件导致回发 }

谢谢

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以下是“标记为答案”链接中的代码（只需将代码粘贴在此处，以便节省读者时间）：

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通常最好包含主代码示例（就像编辑之前一样），以防您链接到的页面被删除，当然也要保留到文章的链接：）

private string getPostBackControlName()
 {

    Control control = null;
    //first we will check the "__EVENTTARGET" because if post back made by       the controls
    //which used "_doPostBack" function also available in Request.Form collection.

    string ctrlname = Page.Request.Params["__EVENTTARGET"];
    if (ctrlname != null && ctrlname != String.Empty)
    {
        control = Page.FindControl(ctrlname);
    }

    // if __EVENTTARGET is null, the control is a button type and we need to
    // iterate over the form collection to find it
    else
    {
        string ctrlStr = String.Empty;
        Control c = null;
        foreach (string ctl in Page.Request.Form.AllKeys)
        {            

            c = Page.FindControl(ctl);               
            if (c is System.Web.UI.WebControls.Button ||

                     c is System.Web.UI.WebControls.ImageButton )
            {
                control = c;
                break;
            }
        }
    }

    if (control == null)
        return "";
    else
        return control.ID; 

}