public async Task ExecuteLoadItemsCommand()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
Items1.Clear();
Items2.Clear();
Items3.Clear();
var items = dataAccess.GetDataFromServer("1");
Items1.ReplaceRange(items);
items = dataAccess.GetDataFromServer("2");
Items2.ReplaceRange(items);
items = dataAccess.GetDataFromServer("3");
Items3.ReplaceRange(items);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
MessagingCenter.Send(new MessagingCenterAlert
{
Title = "Error",
Message = "Unable to load items.",
Cancel = "OK"
}, "message");
}
finally
{
IsBusy = false;
}
}
/// <summary>
/// 级联绑定菜单
/// </summary>
/// <param name="item"></param>
private Task OnCascadeBindSelectClick(SelectedItem item)
{
Items2.Clear();
if (item.Value == "Beijing")
{
Items2.AddRange(new SelectedItem[]
{
new SelectedItem("1", "朝阳区")
{
Active = true
},
new SelectedItem("2", "海淀区")
});
}
else if (item.Value == "Shanghai")
{
Items2.AddRange(new SelectedItem[]
{
new SelectedItem("1", "静安区"),
new SelectedItem("2", "黄浦区")
{
Active = true
},
});
}
Select1.SetItems(Items2);
return(Task.CompletedTask);
}
/// <summary>
/// 级联绑定菜单
/// </summary>
/// <param name="item"></param>
private async Task OnCascadeBindSelectClick(SelectedItem item)
{
await Task.Delay(100);
Items2.Clear();
if (item.Value == "Beijing")
{
Items2.AddRange(new SelectedItem[]
{
new SelectedItem("1", "朝阳区")
{
Active = true
},
new SelectedItem("2", "海淀区")
});
}
else if (item.Value == "Shanghai")
{
Items2.AddRange(new SelectedItem[]
{
new SelectedItem("1", "静安区"),
new SelectedItem("2", "黄浦区")
{
Active = true
},
});
}
StateHasChanged();
}
