铸造数据源列出< T> [英] Casting DataSource to List<T>

问题描述

我有以下方法加载产品上一个DataGridView

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;
}

而现在我想给我回来拯救他们，如下所示

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;
}

不过，我得到一个 InvalidCastException的在这条线：

List<object> products = (List<object>)Source.DataSource;

所以，我怎么能投的数据源到一个列表？

So how can I cast the DataSource to an List?

推荐答案

您可以不投协变直接把名单;

You can't cast covariantly directly to List;

或者：

List<Product> products = (List<Product>)Source.DataSource;

或

List<Object> products = ((List<Product>)Source.DataSource).Cast<object>().ToList();

这篇关于铸造数据源列出< T>的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！