列表不落实 IBindingList的所以网格不知道你的新项目。

List does not implement IBindingList so the grid does not know about your new items.

绑定你的DataGridView到的BindingList＆LT; T＆GT; 而不是

Bind your DataGridView to a BindingList<T> instead.

var list = new BindingList<Person>(persons);
myGrid.DataSource = list;

不过，我甚至会更进一步，网格绑定到的BindingSource

var list = new List<Person>()
{
    new Person { Name = "Joe", },
    new Person { Name = "Misha", },
};
var bindingList = new BindingList<Person>(list);
var source = new BindingSource(bindingList, null);
grid.DataSource = source;