WPF的SelectedIndex CommandParameter

Question

按鈕的命令是ExcelExportCommand其CommandParameter是這樣的：

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

我怎樣才能通過視圖模型編程方式獲得的SelectedIndex？我是新來的MVVM模式，我想驗證我採取了正確的方法。你能幫我嗎？

在此先感謝

Answer 1

您可以ListTabControl的SelectedIndex屬性綁定到您的視圖模型的整數屬性：

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

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