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private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (((e.KeyChar >= 48) && (e.KeyChar <= 57)) || ((e.KeyChar >= 97) && (e.KeyChar <= 122)))
e.Handled = false;
else
e.Handled = true;
}
private void txt_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar != (char)Keys.Back && !char.IsDigit(e.KeyChar) )
{
e.Handled = true;
}
}
string a = "aabbbb";
bool f= a.Contains("ab");//判断是否包含