C# 動態產生或移除多組按鈕－天天向上

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當有多個按鈕需要產生時, 如何用loop方式動態產生, 並加入對應的click event

1. 產生一個新的form, 並在該form上面產生MxN組的按鈕




   1: public void showForm()
   2:  
   3: {
   4:  
   5:     Form frm = new Form();
   6:  
   7:     for (int i = 0; i < m_cols; i++)
   8:  
   9:     {
  10:  
  11:         for (int j = 0; j < m_rows; j++)
  12:  
  13:         {
  14:  
  15:             Button btn = new Button();
  16:  
  17:             frm.AcceptButton = btn;
  18:  
  19:             frm.Controls.Add(btn);
  20:  
  21:             btn.Left = m_btnWidth * i;
  22:  
  23:             btn.Top = m_btnHeight * j;
  24:  
  25:             btn.Width = m_btnWidth;
  26:  
  27:             btn.Height = m_btnHeight;
  28:  
  29:             btn.Text = (j+1).ToString() + ", " + (i+1).ToString();
  30:  
  31:             btn.Click += new EventHandler(myClick);
  32:  
  33:         }
  34:  
  35:     }
  36:  
  37:     frm.Show();
  38:  
  39: }

其中 myClick定義如下

private void myClick(object sender, EventArgs e)
{
    MessageBox.Show(((Button)sender).Text);}

2. 指派一個panel, 在該panels上面產生MxN組的按鈕

   1: public void showOnPanel(Panel panel)   2: {   3:     removeAllBtns(panel);   4:     for (int i = 0; i < m_cols; i++)   5:     {   6:         for (int j = 0; j < m_rows; j++)   7:         {   8:         Button btn = new Button();   9:         panel.Controls.Add(btn);  10:         btn.Left = m_btnWidth * i;  11:         btn.Top = m_btnHeight * j;  12:         btn.Width = m_btnWidth;  13:         btn.Height = m_btnHeight;  14:         btn.Text = (j+1).ToString() + ", " + (i+1).ToString();  15:         btn.Click += new EventHandler(myClick);  16:         }  17:     }  18: }

移除按鈕部分, 一趟並不會將所有panel上的button回傳, 所以加入while迴圈, 真是神奇

   1: private static void removeAllBtns(Panel panel)   2: {   3:      while (panel.Controls.Count > 0)   4:         foreach (Control item in panel.Controls.OfType<Button>())   5:         {   6:              Button btn = (Button)item;   7:              //MessageBox.Show(btn.Text);   8:              panel.Controls.Remove(item);   9:         }  10: }