我在哪裏標記一個lambda表達式異步？

Question

我有這樣的代碼：

private async void ContextMenuForGroupRightTapped(object sender, RightTappedRoutedEventArgs args) 
{ 
    CheckBox ckbx = null; 
    if (sender is CheckBox) 
    { 
     ckbx = sender as CheckBox; 
    } 
    if (null == ckbx) 
    { 
     return; 
    } 
    string groupName = ckbx.Content.ToString(); 

    var contextMenu = new PopupMenu(); 

    // Add a command to edit the current Group 
    contextMenu.Commands.Add(new UICommand("Edit this Group", (contextMenuCmd) => 
    { 
     Frame.Navigate(typeof(LocationGroupCreator), groupName); 
    })); 

    // Add a command to delete the current Group 
    contextMenu.Commands.Add(new UICommand("Delete this Group", (contextMenuCmd) => 
    { 
     SQLiteUtils slu = new SQLiteUtils(); 
     slu.DeleteGroupAsync(groupName); // this line raises Resharper's hackles, but appending await raises err msg. Where should the "async" be? 
    })); 

    // Show the context menu at the position the image was right-clicked 
    await contextMenu.ShowAsync(args.GetPosition(this)); 
} 

...這ReSharper的檢查抱怨被調用完成前大約用，「因爲這個電話是不是等待，當前方法的執行繼續考慮應用。 '等待'運營商致電的結果「（與評論一致）。

因此，我預先安排了一個「等待」，但當然，我還需要在某處添加「異步」 - 但是在哪裏？

Answer 1

爲了紀念一個lambda異步，簡單地將async它的參數列表前：

// Add a command to delete the current Group 
contextMenu.Commands.Add(new UICommand("Delete this Group", async (contextMenuCmd) => 
{ 
    SQLiteUtils slu = new SQLiteUtils(); 
    await slu.DeleteGroupAsync(groupName); 
}));