在我的ArrayList中添加，更改和删除? [英] add, change and delete in my ArrayList?

问题描述

您好，我正在尝试在c#中进行预订程序.
我需要帮助的是如何编写方法来添加，更改和删除ArrayList中的客户对象?

到目前为止，我已经做到了，但是我认为这是不正确的

Hi, Im trying to make a reservation program in c #.
What I need help with is how I can write methods to add, change and delete customer object in my ArrayList?

i have done this so far but it isnt correct in my believ

class CustomerManager
    {

        private ArrayList customers;

        public CustomerManager()
        {
            ArrayList cust = new ArrayList();
            customers = cust;
        }

        public int Count
        {
            get
            {
                return Count;
            }
            set
            {
                foreach (int i in customers)
                {
                    Count++;
                }
            }
        }

        public int GetNewID
        {
            get
            {
                throw new System.NotImplementedException();
            }
            set
            {
            }
        }

        public bool AddCustomer()
        {
            foreach(int i in customers)

            if (customers != null)
            {
                customers.Add(i);
                return true;
            }
            else
                return false;
        }

        public bool ChangeCustomer()
        {
            throw new System.NotImplementedException();
        }

        public bool DeleteCustomer()
        {
            throw new System.NotImplementedException();
        }

        public Customer GetCustomer()
        {
            throw new System.NotImplementedException();
        }

        public void TestValues()
        {
            throw new System.NotImplementedException();
        }
    }
}

推荐答案

首先，不要使用ArrayList.此类型是非泛型的.通过在.NET Framework 2.0中引入泛型，使所有此类集合类型都已过时.非泛型集合不好，因为它们需要类型转换，这可能是不安全的.

始终使用通用集合类，例如System.Collections.Generic.List，请参见:
http://msdn.microsoft.com/en-us/library/system.collections. generic.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx [ ^ ].

即使ArrayList和其他非泛型集合由于它们足以使旧项目兼容而没有正式过时，但对于任何新开发来说，它们都是过时的.

进行更改；而其他一切都是微不足道的.

—SA

First of all, don''t use ArrayList. This type is non-generic. All such collection types are made obsolete by introduction of generics in .NET Framework 2.0. The non-generic collections are not good because they require type cast which is potentially unsafe.

Always use generic collection classes such as System.Collections.Generic.List, see:
http://msdn.microsoft.com/en-us/library/system.collections.generic.aspx[^],
http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx[^].

Even though ArrayList and other non-generic collections are not formally made obsolete because they are good enough to keep legacy projects compatible, they are obsolete for any new development.

Make this change; and everything else is trivial.

—SA

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