【Vegas原创】Winform中使用MaskedTextBox制作IP地址输入框

private void txtPACSIP_KeyDown(object sender, KeyEventArgs e)

    {

        if (e.KeyCode == Keys.Decimal)

        {

            int pos = txtPACSIP.SelectionStart;

            int max = (txtPACSIP.MaskedTextProvider.Length - txtPACSIP.MaskedTextProvider.EditPositionCount);

            int nextField = 0;

            for (int i = 0; i < txtPACSIP.MaskedTextProvider.Length; i++)

            {

                if (!txtPACSIP.MaskedTextProvider.IsEditPosition(i) && (pos + max) >= i)

                    nextField = i;

            }

            nextField += 1;

            // We're done, enable the TabStop property again   

            txtPACSIP.SelectionStart = nextField;

        }

    } 

PingReply reply = p1.Send(this.txtPACSIP.Text.Replace(" ",""));