Visual Studio 2012 中的组合框和计时器

Question

编辑后的代码为：

private void Form1_load(object sender, EventArgs e)
{
}

private void ComboBox1_SelectedIndexChanged(object sender, System.EventArgs e)

    {
        try
        {
            if (comboBox1.Text == "Present")
            {

                label47.Text = DateTime.Now.ToShortDateString();
                label9.Text = DateTime.Now.ToShortTimeString(); 
            }
        }
        catch (Exception)
        {

        }
    }
}
}

Answer 1

使用选定的索引更改事件

private void ComboBox1_SelectedIndexChanged(object sender,System.EventArgs e)
{
 try
 {
   if(ComboBox1.Text == "present")
    {
      label.Text = DateTime.Now.ToString(@"MM\/dd\/yyyy HH:mm");
    } 
 }catch(Exception)
 {
 }
}