如何将最大整数值设置为TextBox值

Question

I have a TextBox with regex validation. It will be for counting days in a year,so I wanna set max value to 366. I wrote LINQ for it,but somehow It always get back false. If I exceed It and my validation turn to false,I want the program to set the max value automatically in my false statement. My code:

XAML:

<TextBox PreviewTextInput="Num" MaxLength="3" HorizontalAlignment="Left" Height="25" Margin="300,130,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="140" Name="tNum" TextChanged="tbNum_TextChanged"/>

Please help me :)

Answer 1

You can use the key down event and check if the content of your textbox + the key that was pressed is more than 365

private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
       //write your validating 
    }
}