出于一些与业务相关的原因，我制作了一个向导导航用户控件。很简单：下一个/上一个/完成按钮。
使用此导航用户控件的每个父页面都有一个 SaveData 函数，该函数可以保存数据并执行许多其他操作。
当用户单击 Next/Previous/Finish 时，我想在重定向到其他页面之前调用父级的 SaveData 函数。我应该怎么做或者你能推荐一个更好的方法（如果可能的话，请提供代码示例）？
提前致谢！
【问题讨论】：
OnSave 事件，因此当您在页面上声明该控件时，您可能会执行类似<uc:MyControl runat="server" OnSave="SaveData" /> 的操作
标签： asp.net vb.net user-controls
你只需要委托：
public delegate void ClickEventHandler(object sender, EventArgs e);
public event ClickEventHandler NextClicked;
【讨论】：
UserControl 不应调用 Parent 的函数。这不是一个好的设计。
相反，您希望将事件从 UserControl 冒泡到 Parent 页面。
注意：我的项目的命名空间是DemoWebForm。
<%@ Control Language="C#" AutoEventWireup="true"
CodeBehind="MyUserControl.ascx.cs"
Inherits="DemoWebForm.MyUserControl" %>
<asp:Button runat="server" ID="NextButton"
OnClick="NextButton_Click" Text="Next" />
<asp:Button runat="server" ID="PreviousButton"
OnClick="PreviousButtonn_Click" Text="Previous" />
<asp:Button runat="server" ID="FinishButton"
OnClick="FinishButton_Click" Text="Finish" />
public partial class MyUserControl : System.Web.UI.UserControl
{
public event ClickEventHandler NextClicked;
public event ClickEventHandler PreviousClicked;
public event ClickEventHandler FinishClicked;
protected void NextButton_Click(object sender, EventArgs e)
{
if (NextClicked != null)
{
NextClicked(sender, e);
}
}
protected void PreviousButtonn_Click(object sender, EventArgs e)
{
if (PreviousClicked != null)
{
PreviousClicked(sender, e);
}
}
protected void FinishButton_Click(object sender, EventArgs e)
{
if (FinishClicked != null)
{
FinishClicked(sender, e);
}
}
}
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Parent.aspx.cs"
Inherits="DemoWebForm.Parent" %>
<%@ Register Src="MyUserControl.ascx" TagName="MyUserControl" TagPrefix="uc1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<uc1:MyUserControl ID="MyUserControl1" runat="server"
OnNextClicked="MyUserControl1_NextClicked"
OnPreviousClicked="MyUserControl1_PreviousClicked"
OnFinishClicked="MyUserControl1_FinishClicked" />
<asp:Literal runat="server" ID="MessageLiteral" />
</form>
</body>
</html>
public partial class Parent : System.Web.UI.Page
{
protected void MyUserControl1_NextClicked(object sender,EventArgs e)
{
MessageLiteral.Text = "Next button was clicked";
}
protected void MyUserControl1_PreviousClicked(object sender, EventArgs e)
{
MessageLiteral.Text = "Previous button was clicked";
}
protected void MyUserControl1_FinishClicked(object sender, EventArgs e)
{
MessageLiteral.Text = "Finish button was clicked";
}
}
【讨论】：