Question

出于某些与业务相关的原因，我做了一个向导导航用户控件。非常简单：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其他一些操作。

当用户单击下一个/上一个/完成时，我想在重定向到另一个页面之前调用父的SaveData函数。我该怎么做？或者你能推荐一种更好的方法（请尽可能使用代码示例）？

提前致谢！

Answer 1

UserControl 不应调用 Parent 的功能。这不是一个好的设计。

相反，您希望将事件从 UserControl 冒泡到父页面。

注意：我的项目命名空间是 DemoWebForm 。

MyUserControl.ascx

<%@ 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" />

MyUserControl.ascx.cs

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);
        }
    }
}

Parent.aspx

<%@ 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>

Parent.aspx.cs

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";
    }
}

Answer 2

您只需要委托：

public delegate void ClickEventHandler(object sender, EventArgs e);
public event ClickEventHandler NextClicked;

从用户控件中调用父方法

2 个答案:

MyUserControl.ascx

MyUserControl.ascx.cs

Parent.aspx

Parent.aspx.cs