母版页访问内容页函数问题

Question

母版页中定义委托：

public delegate void ElementSelectedChangeHandler();
public ElementSelectedChangeHandler ElementSelectedChange ;

if (ElementSelectedChange != null)       
 {           
 ElementSelectedChange();   
 }

内容页中指定一个与委托签名匹配的方法： Master.ElementSelectedChange = this.ElementSelectedChange;

问题是在内容页中无法这样写匹配的方法，如何做，写在类定义中还是load里面，好像都不行，Master无法直接调用.ElementSelectedChange

Answer 1

你好,
在 OnPreLoad 中写这个方法. 并且一定要在你的aspx 页面上加上**VirtualPath **.
母版页:

public delegate void ElementSelectedChangeHandler();
        public ElementSelectedChangeHandler ElementSelectedChange;
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void BtnSearch_Click(object sender, EventArgs e)
        {
            if (ElementSelectedChange != null)
            {
                ElementSelectedChange();
            }
        }

内容页:

<%@ MasterType VirtualPath="~/Site7.master" %>

 protected override void OnPreLoad(EventArgs e)
        {
            base.OnPreLoad(e);
            Master.ElementSelectedChange = this.ElementSelectedChange;
        }
        void ElementSelectedChange()
        {
        }