在C＃中等效的TypeOf和CType代码[关闭]

Question

有人可以帮我提供与C＃相同的代码吗

Public Sub ClearTextBox(ByVal root As Control)
    For Each ctrl As Control In root.Controls
        ClearTextBox(ctrl)
        If TypeOf ctrl Is TextBox Then
            CType(ctrl, TextBox).Text = String.Empty
        End If
    Next ctrl
End Sub

Answer 1

public void ClearTextBox(Control root)
{
    foreach (Control ctrl in root.Controls)
    {
        ClearTextBox(ctrl);
        if (ctrl is TextBox)
        {
            ctrl.Text = string.Empty;
        }
    }
}