C#定义父类PageBase检查登陆及消息提示

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using System.Web.SessionState;
public class PageBase : System.Web.UI.Page
{
    /// <summary>
    /// 登陆检查
    /// </summary>
    protected override void OnLoad(EventArgs e)
    {
        if (Session["eCase_sEmployeeName"] == null)
        {
            Response.Redirect("login.aspx");
        }
        base.OnLoad(e);
    }
    /// <summary>
    /// 消息弹出
    /// </summary>
    /// <param name="strMessage"></param>
    /// <param name="type">1弹出消息,2弹出消息关闭当前窗口,3弹出消息关闭当前窗口刷新父窗口</param>
    public void MsgShow(string strMessage,int type)
    {
        switch (type)
        {
            case 1:
                Response.Write("<script>alert('" + strMessage + "');</script>");
                break;
            case 2:
                Response.Write("<script>alert('" + strMessage + "');window.close();</script>");
                break;
            case 3:
                Response.Write("<script>alert('" + strMessage + "');window.opener.location.href = window.opener.location.href;if (window.opener.progressWindow)window.opener.progressWindow.close();window.close();</script>");
                break;
        }
    }
}