如何從ItemsSource中獲取項目以便雙擊TreeViewItem的子TextBlock？

Question

我有與TreeViewItems一個TreeView，這ItemsSource是ObservableCollection<MyClass>

var myList = new ObservableCollection<MyClass>(); 
TreeView treeView = new TreeView(); 
TreeViewItem treeViewItem = new TreeViewItem { 
    Header = headerStackPanel, 
    ItemsSource = myList 
}; 
treeView.Items.Add(treeViewItem); 

我怎樣才能得到的MyClass當雙擊對象對應的TextBlock？只有我所做的就是讓MyClass.ToString()，其專賣店在TextBlock.Text件事：

treeViewItem.MouseDoubleClick += (sender, args) => { 
    TextBlock tb = args.OriginalSource as TextBlock; 
    if (tb == null) { 
     return; 
    } 
    string myClassToString = tb.Text; 
}; 

另外：不是從XAML，從代碼。

Answer 1

鑄造的TreeView的SelectedItem到MyClass：

treeViewItem.MouseDoubleClick += (sender, args) => { 
    if (yourTreeView.SelectedItem is MyClass) { 
     var myClass = yourTreeView.SelectedItem as MyClass; 
     //Do something with myClass. 
    } 
    //Additionally in this aproach you can 
    //check if selected item is TreeViewItem and get e.g. Header property. 
    else if (yourTreeView.SelectedItem is TreeViewItem) { 
     var treeViewItem = yourTreeView.SelectedItem as TreeViewItem; 
     string header = treeViewItem.Header; 
    }  
}; 

或以同樣的方式使用的TextBlockDataContext屬性：

treeViewItem.MouseDoubleClick += (sender, args) => { 
    TextBlock tb = args.OriginalSource as TextBlock; 
    if (tb == null) { 
     return; 
    } 
    else if (tb.DataContext is MyClass) { 
     var myClass = tb.DataContext as MyClass; 
     //Do something with myClass 
    }  
}; 

Answer 2

你可以得到你的TextBlock的DataContext的。