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如何：创建和使用 GridLengthConverter 对象

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示例

下面的示例演示如何创建并使用 GridLengthConverter 的实例。 该示例定义了一个名为 changeCol 的自定义方法，该方法将 ListBoxItem 传递给 GridLengthConverter，从而将 ListBoxItem 的 Content 转换为 GridLength 的实例。 然后，此转换值作为 ColumnDefinition 元素的 Width 属性的值传回。

此示例还定义称为 changeColVal 的另一个自定义方法。 此自定义方法将 Slider 的 Value 转换为 String，然后将该值作为元素的 Width 传递回 ColumnDefinition。

请注意，单独的 Extensible Application Markup Language (XAML) 文件可定义 ListBoxItem 内容。

private void changeColVal(object sender, RoutedEventArgs e)
{
    txt1.Text = "Current Grid Column is " + hs1.Value.ToString();
}

private void changeCol(object sender, SelectionChangedEventArgs args)
{
    ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
    GridLengthConverter myGridLengthConverter = new GridLengthConverter();
    if (hs1.Value == 0)
    {
        GridLength gl1 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
        col1.Width = gl1;
    }
    else if (hs1.Value == 1)
    {
        GridLength gl2 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
        col2.Width = gl2;
    }
    else if (hs1.Value == 2)
    {
        GridLength gl3 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
        col3.Width = gl3;
    }
}

Private Sub changeColVal(ByVal sender As Object, ByVal args As RoutedPropertyChangedEventArgs(Of Double))

    txt1.Text = "Current Grid Column is " + hs1.Value.ToString()
End Sub

Private Sub changeCol(ByVal sender As Object, ByVal args As SelectionChangedEventArgs)

    Dim li1 As ListBoxItem = CType(CType(sender, ListBox).SelectedItem, ListBoxItem)
    Dim myGridLengthConverter As System.Windows.GridLengthConverter = New System.Windows.GridLengthConverter()
    If (hs1.Value = 0) Then

        Dim gl1 As GridLength = CType(myGridLengthConverter.ConvertFromString(li1.Content.ToString()), GridLength)
        col1.Width = gl1

    ElseIf (hs1.Value = 1) Then

        Dim gl2 As GridLength = CType(myGridLengthConverter.ConvertFromString(li1.Content.ToString()), GridLength)
        col2.Width = gl2

    ElseIf (hs1.Value = 2) Then

        Dim gl3 As GridLength = CType(myGridLengthConverter.ConvertFromString(li1.Content.ToString()), GridLength)
        col3.Width = gl3
    End If
End Sub

另请参阅