非静态字段,方法或属性需要对象引用

Question

这是我第一次与Lists合作,而我似乎并没有做到这一点.我有一个Customer类,其客户列表作为Customer类中的属性(可以这样做吗？)

public class Customer
{
    private List<Customer> customers = new List<Customer>();

    public List<Customer> Customers
    {
        get { return customers; }
        set { customers = value; }
    }

在我的程序中,我添加到此客户列表中,如下所示:

Customer C = new Customer();
Customer.InputCustomer(C);
C.Customers.Add(C);

现在我需要在此列表中显示客户.我已将AllCustomers函数添加到Customer Class,如下所示:

public static void AllCustomers()
    {
        foreach (Customer customer in Customers) //Fail on "Customers"
        {
            Console.WriteLine("Customer ID: " + customer.ID);
            Console.WriteLine("Customer Name: " + customer.FullName);
            Console.WriteLine("Customer Address: " + customer.Address);
            Console.WriteLine();
        }
    }

但我在foreach声明中得到了这个错误:

非静态字段,方法或属性'AddCustomerList.Customer.Customers.get'需要对象引用

就像我说的,这是我第一次使用List,maby我不明白吧？谁能帮帮我吗？

Answer 1

问题是您尝试Customers从静态方法中访问非静态属性.

我怀疑你想要的是这个:

public void AllCustomers()
{
    // ...

(即摆脱静态修饰符)

或者,您也可以将两者customers和Customers成员静态化:

private static List<Customer> customers = new List<Customer>();

public static List<Customer> Customers
{
    get { return customers; }
    set { customers = value; }
}