C# 動態產生控制項與事件繫結 (2/2)：WinForms 按鈕動態建立與 Click 事件、ASP.NET Command 事件

WinForms 動態按鈕

private int _btnCount = 0;
private void button1_Click(object sender, EventArgs e)
{
    _btnCount++;
    var btn = new Button
    {
        Name = "btn" + _btnCount,
        Text = "動態按鈕 " + _btnCount,
        Location = new Point(12, 13 + _btnCount * 30)
    };
    panel1.Controls.Add(btn);
    btn.Click += Btn_Click; // 共用事件處理器
}

private void Btn_Click(object sender, EventArgs e)
{
    var b = (Button)sender;
    MessageBox.Show(b.Name);
}

ASP.NET 動態控制項事件

語法：Control.Command += new CommandEventHandler(this.EventMethod);

適用於 Button、LinkButton、ImageButton 等實作 IButtonControl 的控制項。

完整 ASP.NET 範例

// 動態建立 Button 並加入 Panel
Button btn = new Button { ID = "dynamicBtn", Text = "Click Me", CommandArgument = "arg1" };
btn.Command += DynamicBtn_Command;
Panel1.Controls.Add(btn);

void DynamicBtn_Command(object sender, CommandEventArgs e)
{
    Response.Write($"CommandArgument: {e.CommandArgument}");
}