c# TextBox只允許輸入數字，禁用右鍵粘貼，允許Ctrl+v粘貼數字

TextBox只允許輸入數字，最大長度為10

       //TextBox.ShortcutsEnabled為false  禁止右鍵和Ctrl+v
        private void txtNumber_KeyPress(object sender, KeyPressEventArgs e)
        {
            //只允許輸入數字，粘貼數字
            if (!(Char.IsNumber(e.KeyChar) || e.KeyChar == (char)8))
            {
                e.Handled = true;
            }
        }
        //允許Ctrl+v粘貼數字
        private void txtNumber_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyData == (Keys.Control | Keys.V))
            {
                if (Clipboard.ContainsText())
                {
                    try
                    {
                        Convert.ToInt64(Clipboard.GetText());  //檢查是否數字
                        ((TextBox)sender).SelectedText = Clipboard.GetText().Trim(); //Ctrl+V 粘貼  
                        if (((TextBox)sender).TextLength > 10)
                        {
                            ((TextBox)sender).Text = ((TextBox)sender).Text.Remove(10); //TextBox最大長度為10  移除多余的
                        }
                    }
                    catch (Exception)
                    {
                        e.Handled = true;
                        //throw;
                    }
                }
            }
        }

 

第二種辦法：

1、先創建一個ToolStripMenuItem，添加 菜單列表 “復制” 和 “粘貼” 。

2、設置同一事件txtToolStripMenuItem_Click

       //復制粘貼處理
        private void txtToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string txtname = ((ToolStripMenuItem)sender).Text;
            if (txtname.Equals("復制"))
            {
                SendKeys.SendWait("^c");  //Ctrl + C
            }
            if (txtname.Equals("粘貼"))
            {
                SendKeys.SendWait("^v");  //Ctrl + V
            }
        }

3、TextBox 屬性 ContextMenuStrip 綁定 ToolStripMenuItem

4、TextBox添加事件txtOrderID_KeyPress

       //只允許輸入數字，粘貼數字
        private void txtOrderID_KeyPress(object sender, KeyPressEventArgs e)
        {
            //只允許輸入數字，粘貼數字
            if (!(Char.IsNumber(e.KeyChar) || e.KeyChar == (char)8 || e.KeyChar == (char)3 || e.KeyChar == (char)22))
            {
                e.Handled = true;
            }
            try
            {
                if (e.KeyChar == (char)22)
                {
                    Convert.ToInt64(Clipboard.GetText());  //檢查是否數字
                    Clipboard.SetText(Clipboard.GetText().Trim()); //去空格
                }
            }
            catch (Exception)
            {
                e.Handled = true;
                //throw;
            }

5、ToolStripMenuItem 菜單 “復制” 和 “粘貼” 創建 同一Click事件。

       //復制粘貼處理
        private void txtToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string txtname = ((ToolStripMenuItem)sender).Text;
            if (txtname.Equals("復制"))
            {
                SendKeys.SendWait("^c");  //Ctrl + C
            }
            if (txtname.Equals("粘貼"))
            {
                SendKeys.SendWait("^v");  //Ctrl + V
            }
        }