Question

我的代码在1D数组上正常工作，但是当我尝试制作2D数组时，我收到一条错误消息

错误消息：

NullReferenceException: Object reference not set to an instance of an object

这是我的代码：

public class NewBehaviourScript : MonoBehaviour
{
    
    public CoreManager[] mng2 = new CoreManager[5];
    public CoreManager[][] mng = new CoreManager[5][];
   
    void Start()
    {


        //this code works fine 
        mng2[1].actual_words = new string[5];
        mng2[1].actual_words[0] = "test 1 ";
        Debug.Log(mng2[1].actual_words[0]);

     
        //this code gives me the error message  
        mng[0][0].actual_words = new string[5]; // the error message is about this line  
        mng[0][0].actual_words[0] = "test 2 ";
        Debug.Log(mng[0][0].actual_words[0]);
    }
}

CoreManager类：

public class CoreManager
{

    [Tooltip("Write these words in actual sequence of the sentence")]
    public string[] actual_words;

    [Tooltip("Write these words in any sequence of the sentence")]
    public string[] mixed_words;

}

Answer 1

您尝试在此处构建的是锯齿状阵列。对于锯齿状数组的每个其他维，您还需要为其创建一个实例。就您而言，它看起来像：

mng[0] = new CoreManager[number of elements you want];
mng[0][0] = new CoreManager();
mng[0][0].actual_words = new string[5]; // the error message is about this line  
mng[0][0].actual_words[0] = "test 2 ";
Debug.Log(mng[0][0].actual_words[0]);

这是锯齿阵列上的Microsoft docs。

我正在尝试将数据插入对象的2D数组

1 个答案: