下面的代码给了我这个错误：
无法转换自
'系统.集合.通用.列表'
到
'系统.集合.通用.列表'。
如何向编译器表明 Customer 确实是从 object 继承的？或者它只是不使用通用集合对象进行继承（发送一个List<string>得到同样的错误）。
using System.Collections.Generic;
using System.Windows;
using System.Windows.Documents;
namespace TestControl3423
{
public partial class Window2 : Window
{
public Window2()
{
InitializeComponent();
List<Customer> customers = Customer.GetCustomers();
FillSmartGrid(customers);
//List<CorporateCustomer> corporateCustomers = CorporateCustomer.GetCorporateCustomers();
//FillSmartGrid(corporateCustomers);
}
public void FillSmartGrid(List<object> items)
{
//do reflection on items and display dynamically
}
}
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string Street { get; set; }
public string Location { get; set; }
public string ZipCode { get; set; }
public static List<Customer> GetCustomers()
{
List<Customer> customers = new List<Customer>();
customers.Add(new Customer { FirstName = "Jim", LastName = "Jones", ZipCode = "23434" });
customers.Add(new Customer { FirstName = "Joe", LastName = "Adams", ZipCode = "12312" });
customers.Add(new Customer { FirstName = "Jake", LastName = "Johnson", ZipCode = "23111" });
customers.Add(new Customer { FirstName = "Angie", LastName = "Reckar", ZipCode = "54343" });
customers.Add(new Customer { FirstName = "Jean", LastName = "Anderson", ZipCode = "16623" });
return customers;
}
}
}
.NET 还没有协变和逆变。
B 源自 A 并不意味着List<B>源自于List<A>。事实并非如此。他们是两种完全不同的类型。
.NET 4.0 将获得有限的协方差和逆变。
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