Question by uesugichezt · Dec 16, 2017 at 09:29 AM · dictionary static variable local variable

Copy static Dictionary value for local change

Hello I tried create list of monster using static dictionary and I want the value of that dictionary to change in only in local, here's some example

 public class A {
     public string name;
     public A (string name) {
         this.name = name;
     }
 }
 
 public class m {
     public static Dictionary<string, A> dict = new Dictionary<string, A>();
 }
 
 public class mon : MonoBehaviour {
 
     private A tes;
     // Use this for initialization
     void Start () {
         m.dict.Add("a", new A("its A!"));
         tes = m.dict["a"];
         tes.name = "B";
         Debug.Log(tes.name);
         Debug.Log(m.dict["a"].name); // why this return B instead of "its A!"
     }
     
 }

I don't understand why static dictionary value get changed is there something I miss?

I tried to figure it for hours and still can't get it, and I can't get any match keyword for my problem

Add comment · Show 2

PizzaPie · Dec 16, 2017 at 12:17 PM 2

When you assign a reference type you just assign a pointer on the original object and not a new copy . Which means in this occasion that when you say tes = m.dict["a"] the value of the m.dict["a"] is pointing to tes and it is not a copy of tes. So you have 2 references of the same Object, changes applied to it either with tes.name = "B" or dict["a"].name = "B" will have exacty the same result. Read the C# documentation on referencetypes and value types. Cheers.

PS. nothing to do with static accessor.

uesugichezt PizzaPie · Dec 16, 2017 at 02:39 PM 0

Thank you! this really make me crazy, I don't know about reference I need initialize first tes = new A(m.dict["a"].name) And just found out about deep cloning object Oh god I need to learn more, again thank you!

Copy static Dictionary value for local change

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