我有一段時間沒有完成網絡表單 - 但我對此感興趣。
這三個文件將演示如何使用用戶控件來訂閱事件。
- 基本上我的UserControl1有,我可以訂閱一個事件。
- UserControl2有一個ListView,它將包含UserControl1的實例。我可以在UserControl2中訂閱UserControl1實例中的事件。
- Default.aspx的包含UserControl2的
點擊任何的UserControl1事件的一個實例,將火在這種情況下僅僅發送按鈕,這是的UserControl1文本的活動現場拍下。
VB中的代碼應該非常相似。
的UserControl1
<%@ Control Language="C#" AutoEventWireup="true" %>
<script runat="server">
public delegate void SillyHandler(object sender, string text);
public event SillyHandler SomethingHappened;
public string Name { get; set; }
protected void Button1_Click(object sender, EventArgs e)
{
if (SomethingHappened != null)
SomethingHappened(this.Button1, this.Button1.Text);
}
</script>
<asp:Button ID="Button1" runat="server" Text="<%#this.Name %>" onclick="Button1_Click" />
UserControl2
<%@ Control Language="C#" AutoEventWireup="true" %>
<%@ Register src="UserControl1.ascx" tagname="UserControl1" tagprefix="uc1" %>
<script runat="server">
public List<string> DataSource { get; set; }
protected void SomethingHappened(object sender, string txt)
{
MyLabel.Text = txt;
}
</script>
<asp:ListView runat="server" ID="ListView1" DataSource="<%#DataSource %>">
<ItemTemplate>
<uc1:UserControl1 ID="UserControl11" runat="server" OnSomethingHappened="SomethingHappened" Name="<%#Container.DataItem %>"/>
</ItemTemplate>
</asp:ListView>
<asp:Label runat="server" ID="MyLabel" />
Default.aspx的
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Register src="UserControl2.ascx" tagname="UserControl2" tagprefix="uc1" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
this.UserControl21.DataSource = new List<string> { "A", "B", "C" };
this.UserControl21.DataBind();
}
}
</script>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<uc1:UserControl2 ID="UserControl21" runat="server" />
</div>
</form>
</body>
</html>