HOW TO：設定項目和控制項的邊界

本範例說明如何變更程式碼後置 (Code-Behind) 中任何現有的邊界屬性值，以便設定 Margin 屬性。 Margin 屬性是 FrameworkElement 基底項目的屬性，因此各種控制項和其他項目都會繼承這個屬性。

這個範例是以Extensible Application Markup Language (XAML) 撰寫，其中包含 XAML 所參考的程式碼後置檔案。 該程式碼後置同時顯示成 C# 和 Microsoft Visual Basic 版本。

範例

<Button Click="OnClick" Margin="10" Name="btn1">
Click To See Change!!</Button>

Private Sub OnClick(ByVal sender As Object, ByVal e As RoutedEventArgs)

    ' Get the current value of the property.
    Dim marginThickness As Thickness
    marginThickness = btn1.Margin
    ' If the current leftlength value of margin is set to 10 then change it to a new value.
    ' Otherwise change it back to 10.
    If marginThickness.Left = 10 Then
        btn1.Margin = New Thickness(60)
    Else
        btn1.Margin = New Thickness(10)
    End If
End Sub

void OnClick(object sender, RoutedEventArgs e)
{
    // Get the current value of the property.
    Thickness marginThickness = btn1.Margin;
    // If the current leftlength value of margin is set to 10 then change it to a new value.
    // Otherwise change it back to 10.
    if(marginThickness.Left == 10)
    {
         btn1.Margin = new Thickness(60);
    } else {
         btn1.Margin = new Thickness(10);
    }
}