Question

我将CollectionViewSource用作DataGrid中的ItemSource

<DataGrid
    ItemsSource="{Binding CollViewSource.View}"
    SelectedIndex="{Binding IndexNumber}"
    ...

并且CollectionViewSource绑定到ViewModel中的ObservableCollection

private ObservableCollection<LevelModel> mLevelSource;
public ObservableCollection<LevelModel> LevelSource
{
     get
     {
         mLevelSource = mLevelSource ?? new ObservableCollection<LevelModel>();
         return mLevelSource;
     }
}


public CollectionViewSource CollViewSource { get; set; }

型号

public class LevelModel : BaseViewModel
{
    public string Level_Title { get; set; }
    ...

在构造函数中

CollViewSource = new CollectionViewSource();
CollViewSource.Source = LevelSource;

我在DataGrid中有Button

<DataGridTemplateColumn.CellTemplate>
    <DataTemplate>
        <Button
            Command="{Binding DataContext.ViewCommand, RelativeSource={RelativeSource AncestorType=DataGrid}}"
            CommandParameter="{Binding}"
            Content="View" />
    </DataTemplate>
</DataGridTemplateColumn.CellTemplate>

我想要的是，当我单击按钮时。即ViewCommand，它应按索引号获取Level_Title或其他项目

private ICommand mViewCommand;
public ICommand ViewCommand
{
    get
    {
        if (mViewCommand == null)
        {
            mViewCommand = new DelegateCommand(delegate ()
            {
                int indexNumber = IndexNumber;
                //string title = // logic should go here


            });
        }
        return mViewCommand;
    }
}

例如，当索引号为3时，它应该获取第3个索引上存在的项目

注意：我不想涉及SeletedItem

Answer 1

在您的CollectionView上尝试以下操作：

LevelModel lm = CollViewSource.View.Cast<LevelModel>().ToArray()[indexNumber];
string title = lm.Level_Title;

使用索引号从CollectionViewSource获取项目

1 个答案: