wpf SelectedIndex CommandParameter

Question

按钮的命令是ExcelExportCommand，它的CommandParameter类似于：

<Button x:Name="ExcelExport" Grid.Row="1" Height="25" Width="100" Command="{Binding ExcelExportCommand}" CommandParameter="{Binding ElementName=ListTabControl, Path=SelectedIndex}">Export to Excel</Button>

如何以编程方式通过ViewModel获取SelectedIndex？我是MVVM模式的新手，我想验证我是否采取了正确的方法。你能帮上忙吗？

提前感谢

Answer 1

您可以将ListTabControl的SelectedIndex属性绑定到视图模型中的整数属性：

<List x:Name="ListTabControl" SelectedIndex="{Binding ListSelectedIndex}" />

private int _ListSelectedIndex;
public int ListSelectedIndex {
    get { return _ListSelectedIndex;}
    set
    {
        _ListSelectedIndex = value;
        OnPropertyChanged("ListSelectedIndex"); // if INotifyPropertyChanged implemented
    }
}