如何从另一个UserControl继承UserControl？开发者社区

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<%@ Control Language="C#" AutoEventWireup="true" CodeFile="childusercontrol.ascx.cs" Inherits="test_childusercontrol" %>
<%@ Register src="baseusercontrol.ascx" tagname="baseusercontrol" tagprefix="uc1" %>

public partial class test_childusercontrol : baseusercontrol
    protected void Page_Load(object sender, EventArgs e)
}

Object reference not set to an instance of an object.
Description : An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details : System.NullReferenceException: Object reference not set to an instance of an object.

public class BaseClass:UserControl
    public String BaseGreeting { get { return "Welcomebase!"; }}
}

public partial class childusercontrol : BaseClass
    protected override void OnInit(EventArgs e)
        base.OnInit(e);
        Greeting = base.BaseGreeting; //As initial value

问 如何从另一个UserControl继承UserControl？ EN

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