我在这里有一些代码,并希望知道在哪里等待。我尝试过lamba =>和普通方法,但都没有成功。
private async void ContextMenuAbroad(object sender, RightTappedRoutedEventArgs args)
{
CheckBox ckbx = null;
if (sender is CheckBox)
{
ckbx = sender as CheckBox;
}
if (null == ckbx)
{
return;
}
string nameOfGroup = ckbx.Content.ToString();
var contextMenu = new PopupMenu();
contextMenu.Commands.Add(new UICommand("Edit this Group", (contextMenuCmd) =>
{
Frame.Navigate(typeof(LocationGroupCreator), nameOfGroup );
}));
contextMenu.Commands.Add(new UICommand("Delete this Group", (contextMenuCmd) =>
{
SQLiteUtils rfd = new SQLiteUtils();
rfd.DeleteGroupAsync(nameOfGroup );
}));
await contextMenu.ShowAsync(args.GetPosition(this));
}
我添加了一个等待,但是我需要在某处添加异步...但是在哪里?
Resharpers检查抱怨:“因为没有等待此呼叫,所以在呼叫完成之前继续执行当前方法。考虑将'await'运算符应用于呼叫结果”
任何帮助是极大的赞赏!
只需在参数列表前加上async
// Command to delete the current Group
contextMenu.Commands.Add(new UICommand("Delete this Group", async (contextMenuCmd) =>
{
SQLiteUtils rfd = new SQLiteUtils();
await rfd.DeleteGroupAsync(groupName);
}));
为了标记lambda异步,请使用以下语法:
async (contextMenuCmd) =>
{
SQLiteUtils rfd = new SQLiteUtils();
await rfd.DeleteGroupAsync(nameOfGroup );
}
只需将其添加到括号前面,如下所示:
contextMenu.Commands.Add(new UICommand("Edit this Group", async (contextMenuCmd) =>
{