gistfile1.cs

/// <summary>
/// GrandFather 的摘要描述
/// </summary>
public class GrandFather : System.Web.UI.Page
{
    protected virtual int GetExpireMinutes()
    {
        return 480;
    }

    protected override void OnPreInit(EventArgs e)
    {
        base.OnPreInit(e);
        Response.Write("GrandFather Page_PreInit" + "<br/>");

        var minutes = this.GetExpireMinutes();
        Response.Write(string.Format("expire minutes:{0}", minutes) + "<br/>");
    }
}

/// <summary>
/// Father 的摘要描述
/// </summary>
public class Father : GrandFather
{
    protected override void OnPreInit(EventArgs e)
    {
        base.OnPreInit(e);
        Response.Write("Father Page_PreInit" + "<br/>");

    }
}

//個別設定的子頁面
public partial class Sample : Father
{
    protected override int GetExpireMinutes()
    {
        return 10;
    }

    protected void Page_PreInit(object sender, EventArgs e)
    {
        Response.Write("Sample Page_PreInit" + "<br/>");
    }

    protected void Page_Load(object sender, EventArgs e)
    {

    }
}

//預設的子頁面
public partial class _Default : Father
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}