Xamarin datagrid not show up after OnScanResult Zxing - xamarin.forms

Question

I can get datatable after scan barcode but it not show when i bind it to sfDatagrid. what am i doing wrong. I think i call vm.TimSPTonKho.Execute(null); in .cs incorrectly
code xaml and .cs
<ContentPage.BindingContext>
<vm:vmBanHang_get_TTSanPham_ScanCode />
</ContentPage.BindingContext>
<StackLayout>
<Grid VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand">
<zxing:ZXingScannerView x:Name="scanView"
OnScanResult="scanView_OnScanResult"
IsScanning="True"
WidthRequest="200"
HeightRequest="300"
VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand"/>
<zxing:ZXingDefaultOverlay TopText="Align the barcode within the frame"/>
</Grid>
<datagrid:SfDataGrid HorizontalOptions="Center" x:Name="datagrid"
AllowTriStateSorting="True"
ColumnSizer="Star"
ItemsSource="{Binding DataTableCollection}">
</datagrid:SfDataGrid>
</StackLayout>
this my xaml file
private void scanView_OnScanResult(Result result)
{
Device.BeginInvokeOnMainThread(async () =>
{
await DisplayAlert("Scanned result", "The barcode's text is " + result.Text + ". The barcode's format is " + result.BarcodeFormat, "OK");
var vm = new vmBanHang_get_TTSanPham_ScanCode();
vm.MaSanPham = result.Text;
vm.IDCuaHang = 1;
vm.TimSPTonKho.Execute(null);
});
}
my ViewModel.cs
class vmBanHang_get_TTSanPham_ScanCode : INotifyPropertyChanged
{
private ApiServices _apiServices = new ApiServices();
public int IDCuaHang { get; set; }
public string MaSanPham { get; set; }
public vmBanHang_get_TTSanPham_ScanCode()
{
DataTableCollection = _DataTableCollection;
}
public DataTable DataTableCollection
{
get { return _DataTableCollection; }
set
{
_DataTableCollection = value;
OnPropertyChanged();
}
}
public DataTable _DataTableCollection;
public ICommand TimSPTonKho
{
get
{
return new Command(async () =>
{
if (!string.IsNullOrEmpty(MaSanPham))
{
DataTableCollection = await _apiServices.get_TTSanPham_ScanCode(IDCuaHang, MaSanPham, Settings.Accesstoken);
}
});
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
2. My second question, how can i get all values Datagrid send to Datatable ? do i have to implement it in xaml.cs or in viewmodel.
Thanks for helps

Answer 1

I found the solution. bind directly from xaml.cs
datagrid.ItemsSource = await _apiServices.get_TTSanPham_ScanCode(1, result.Text, Settings.Accesstoken);
instead of call Icommand in Viewmodel
public ICommand TimSPTonKho
{
get
{
return new Command(async () =>
{
if (!string.IsNullOrEmpty(MaSanPham))
{
DataTableCollection = await _apiServices.get_TTSanPham_ScanCode(IDCuaHang, MaSanPham, Settings.Accesstoken);
}
});
}
}