按刷新或退格键清除页面上的所有字段

本文介绍了按刷新或退格键清除页面上的所有字段的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

如何在按下刷新或退格键时清除页面上的所有字段?

how to clear all the field on a page on pressing refresh or backspace?

推荐答案

public void ClearAll(form frm)
{
     foreach(Control ctl in frm.Controls)
     {
        if(ctl is Textbox)
          {
             ctl.text="";
          }
        if(ctl is checkBox)
          {
            ctl.selectedIndex=0;
          }
     }
}

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString());
        }
if (Session["CheckRefresh"].ToString() == ViewState["CheckRefresh"].ToString())
        {
            Label1.Text = "Hello";
            Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString());
        }
        else
        {
            Label1.Text = "Page Refreshed";
            string str = "your code will save here or call save() method here";
//and here you can call clearallfields() method
        }


    }

protected void Page_PreRender(object sender, EventArgs e)
    {
        ViewState["CheckRefresh"] = Session["CheckRefresh"];
    }

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