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Unity C#中嵌套字典的奇怪行为

[英]Strange Behavior of Nested Dictionary in Unity C#

我在字典中使用字典。 分配的最后一个键值也被存储为所有先前键的值,即使各个键分配不同。 我错过了什么吗?

Dictionary<string, Dictionary <int,bool>> seenValsRounds= new Dictionary<string, Dictionary<int, bool>>();

void prepareRoundsVals()
    {       
        Dictionary <int,bool> roundVals = new Dictionary<int, bool> ();
        roundVals.Add (0,false);
        seenValsRounds.Add ("A", roundVals);
        seenValsRounds.Add ("B", roundVals);
        seenValsRounds.Add ("C", roundVals);
        seenValsRounds.Add ("D", roundVals);
        seenValsRounds ["A"] [0] = false;
        seenValsRounds ["B"] [0] = false;
        seenValsRounds ["C"] [0] = false;
        seenValsRounds ["D"] [0] = true;
        foreach (KeyValuePair<string, Dictionary<int,bool>> kvp in seenValsRounds) {            
            Debug.Log(kvp.Key + " in round " + 0 + ": " + seenValsRounds [kvp.Key][0]);     
        }
    }

预期结果:A 为假,B 为假,C 为假,D 为真

实际结果:A 为真,B 为真,C 为真,D 为真


根据答案和评论中的建议解决了以下问题。 每个嵌套字典也应该是“新的”:

        Dictionary <int,bool> roundVals1 = new Dictionary<int, bool> ();
        Dictionary <int,bool> roundVals2 = new Dictionary<int, bool> ();
        Dictionary <int,bool> roundVals3 = new Dictionary<int, bool> ();
        Dictionary <int,bool> roundVals4 = new Dictionary<int, bool> ();
        roundVals1.Add (0,false);
        roundVals2.Add (0,false);
        roundVals3.Add (0,false);
        roundVals4.Add (0,false);
        seenValsRounds.Add ("A", roundVals1);
        seenValsRounds.Add ("B", roundVals2);
        seenValsRounds.Add ("C", roundVals3);
        seenValsRounds.Add ("D", roundVals4);

那是因为您将相同的引用放在了 seenValsRounds 字典中的 roundVals 字典对象中。 您应该为 A、B、C 和 D 创建一个新字典。

它可能有帮助或嵌套字典替代。

创建 Sample.cs 脚本并对其进行测试。

 public Dictionary<string,Tuple<string,string,string,int>> _planets = new 
     Dictionary<string, Tuple<string,string, string, int>>();
     void Start()
     {
           string myKey = string.Concat("1","MetalMine","Level");
           if(!_planets.ContainsKey(myKey))
           {
               _planets.Add(myKey,Tuple.Create("1","MetalMine","Level",0));
           }
           Debug.Log("_planets mykey "+myKey+" ==> "+_planets[myKey].Item4);
     }

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