从另一个类调用非静态变量

Question

I want to call non-static variable from another class. If I make it static, it affects my other code.

I've two classes Harvest_Client and Harvest_Project.

In my Harvest_Project class I've

public int _client_id{ get; set;}

I'just want to do in Harvest_Client class is,

public int _id = Harvest_Project._client_id;

How should I do this?

Answer 1

Firstly, you should rename the property (it's not a variable) to conform with .NET naming conventions, eg

public int ClientId { get; set; }

Next, you need an instance of HarvestProject (post-renaming). Don't just create a new one - you need the right instance, the one whose client ID you're interested in. We can't tell you which one it is - but if you don't already have an instance of HarvestProject to hand, you should work out how you're expecting to specify which client ID you want.

Think of it this way: if I were to ask you "How old is a person?" you'd naturally want to know which person I was talking about. It's exactly the same here.

Answer 2

maybe passing the reference to the class will do what you need:

public class Harvest_Project
    {
        public string Name { get; set; }
        public int clientId { get; set; }
    }

    public class Harvest_Client
    {
        private Harvest_Project MyInstance;

        private int myid;

        public int MyId
        {
            get
            {
                return myid;
            }
            private set
            {
                MyId = value;
            }
        }
        public Harvest_Client(Harvest_Project cls)
        {
            MyInstance = cls;
            MyId = cls.clientId;//since class reference present no 
                                //need for the property.
                                //its just here to show if in your
                                //project you really just need ID
                                //in this example its redundant
        }

    }

Depending on what you are trying to do you can make a List of Harvest_Project objects or better a dictionary,if there are various types of "projects" they could be all placed in a dictionary cataloged accordingly to the specified key.

Answer 3

One moment I would like to recommend to take into consideration the following declaration of property public int ClientId {get; private set;"} public int ClientId {get; private set;"} It allow you to prohibited setting this variable from third party code, if you actually need this. Otherwise you will have ordinary global variable