I have the following method that load products on a DataGridView
private void LoadProducts(List<Product> products)
{
Source.DataSource = products; // Source is BindingSource
ProductsDataGrid.DataSource = Source;
}
And now I'm trying to give me back to save them as shows below.
private void SaveAll()
{
Repository repository = Repository.Instance;
List<object> products = (List<object>)Source.DataSource;
Console.WriteLine("Este es el número {0}", products.Count);
repository.SaveAll<Product>(products);
notificacionLbl.Visible = false;
}
But I get an InvalidCastException
on this line:
List<object> products = (List<object>)Source.DataSource;
So how can I cast the DataSource to an List?
You can't cast covariantly directly to List;
Either:
List<Product> products = (List<Product>)Source.DataSource;
or:
List<Object> products = ((List<Product>)Source.DataSource).Cast<object>().ToList();
So how can I cast the DataSource to an List?
You have plenty of options
var products = (List<Product>)Source.DataSource; // products if of type List<Product>
or
List<Object> products = ((IEnumerable)Source.DataSource).Cast<object>().ToList();
or
List<Object> products = ((IEnumerable)Source.DataSource).OfType<object>().ToList();
or
List<Object> products = new List<Object>();
((IEnumerable)Source.DataSource).AsEnumerable().ToList().ForEach( x => products.Add( (object)x));
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