WPF & C# - 제로패딩 ( ZeroPadding / PadLeft / ToString("D4") / ToString("0000") )

WPF & C# - 제로패딩 ( ZeroPadding / PadLeft / ToString("D4") / ToString("0000") )

testZeroPadding.zip

MainWindow.xaml

<StackPanel Margin="10" VerticalAlignment="Top">
    <TextBox x:Name="tbx" Height="25" Margin="5" TextChanged="tbx_TextChanged"/>
    <!--Int-->
    <Label Margin="5" Content="int" Background="LightGray" FontWeight="Bold"></Label>
    <Label x:Name="lbl01" Margin="5"></Label>
    <Label x:Name="lbl02" Margin="5"></Label>
    <Label x:Name="lbl03" Margin="5"></Label>
 
    <!--String-->
    <Label Margin="5" Content="String" Background="LightGray" FontWeight="Bold"></Label>
    <Label x:Name="lbl04" Margin="5"></Label>
</StackPanel>

MainWindow.xaml.cs

int i = 0;
private void tbx_TextChanged(object sender, TextChangedEventArgs e)
{
    if (tbx.Text != "")
    {
        i = Convert.ToInt32(tbx.Text);
        lbl01.Content = i.ToString().PadLeft(4);
        lbl02.Content = i.ToString("D4");
        lbl03.Content = i.ToString("0000");
 
        string str = i.ToString();
        lbl04.Content = str.PadLeft(4);
    }
}

제로패딩

공백을 삽입하여 자리수를 맞춰주는 역할을 한다.

입력값 1 일때

PadLeft(0) = 1 (공백 0개, 글자수(Lenght) = 1)

PadLeft(1) = 1 (공백 0개, 글자수(Lenght) = 1)

PadLeft(2) =  1 (공백 1개, 글자수(Lenght) = 2)