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我已經創建一個userControl名稱是UserControl1。在這個用戶控件上,我創建一個按鈕名稱是btnAdd。我創建2表單名稱是Form1和Form2。然後我在這些表單上添加UserControl1。我想單擊Form1上的btnAdd按鈕,然後顯示字符串「this is form 1」,如果我單擊Form2上的btnAdd按鈕,然後顯示字符串「this is form 2」。如何在userControl中使用委託和事件?
我想使用委託和事件來做到這一點。你可以幫幫我嗎。 非常感謝。
我的代碼如下但未運行。真正的結果必須顯示在消息框「添加成功」:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
namespace EventDelegateUserControl
{
public partial class UC_them : UserControl
{
public UC_them()
{
InitializeComponent();
}
public delegate void ThemClickHandler(object sender, EventArgs e);
public event ThemClickHandler ThemClick;
public void OnThemClick(EventArgs e)
{
if (ThemClick != null)
{
ThemClick(this,e);
}
}
public void add()
{
OnThemClick(EventArgs.Empty);
}
public void btnThem_Click(object sender, EventArgs e)
{
add();
}
}
//---------------------------
public partial class Form1 : Form
{
public UC_them uc_them =new UC_them();
public Form1()
{
InitializeComponent();
}
public void dangky(UC_them uc_them)
{
uc_them.ThemClick += new UC_them.ThemClickHandler(uc_them_ThemClick);
}
void uc_them_ThemClick(object sender, EventArgs e)
{
MessageBox.Show("Add successful");
}
}
//----------------------------
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
UC_them them = new UC_them();
Form1 form1 = new Form1();
form1.dangky(them);
}
}
}