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//文本框获取焦点时
private void txtsxkh_Enter(object sender, EventArgs e)
{
txtsxkh.SelectionStart = 0;
txtsxkh.SelectionLength = txtsxkh.Text.Length;
txtsxkh.SelectAll();
}
private void txtsxkh_MouseDown(object sender, MouseEventArgs e)
{
txtsxkh.SelectionStart = 0;
txtsxkh.SelectionLength = txtsxkh.Text.Length;
txtsxkh.SelectAll();
}