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private void TxtBox_Enter(object sender, EventArgs e)
{
TextBox tb = (TextBox)sender;
if(tb.Text == "0")
tb.Text = "";
}
private void FrmTrustTest_Load(object sender, EventArgs e)
{
textBox4.Enter += new EventHandler(TxtBox_Enter);
textBox4.Leave += new EventHandler(TxtBox_Leave);
//同理添加你要的TextBox
}
private void TxtBox_Leave(object sender, EventArgs e)
{
TextBox tb = (TextBox)sender;
if (tb.Text.Trim() == "")
tb.Text = "0";
}