如何在调用的 class 中正确初始化二维数组

Question

这是抛出 EdgeList 未初始化的错误。这是 class（相关部分在底部）：

public class TacLineStruct
{
    // The number of unit groups in the Army
    public int NumGroups
    {
        get
        {
            return _NumGroups;
        }
        set
        {
            _NumGroups = value;
        }
    }
    private int _NumGroups;

    // The number of edges, 
    public int NumEdges
    {
        get
        {
            return _NumEdges;
        }
        set
        {
            _NumEdges = value;
        }
    }
    private int _NumEdges;

    // The number of units below the threshold 
    public int NumBelowThreshold
    {
        get
        {
            return _NumBelowThreshold;
        }
        set
        {
            _NumBelowThreshold = value;
        }
    }
    private int _NumBelowThreshold;

    // The specific Group that a unit belongs to
    public int[] GroupID
    {
        get;
        set;
    }

    // The list of all the edges
    public int[][] EdgeList
    {
        get;
        set;
    }

    // The list of all the edge weights
    public float[] EdgeWeight
    {
        get;
        set;
    }

    // The geographical center of each group
    public Point[] GroupCenter
    {
        get;
        set;
    }

    public TacLineStruct(int arrayLength)
    {
        GroupID = new int[arrayLength];
        int[,] EdgeList = new int[(arrayLength * arrayLength),2];
        EdgeWeight = new float[arrayLength * arrayLength];
        GroupCenter = new Point[arrayLength];
    }
}

这就是我调用和初始化它的方式（片段）：

TacLineStruct TLS = new TacLineStruct(Army.Count);

for (int i = 0; i <= Army.Count; i++)
{
    for (int j = i + 1; j <= Army.Count; j++)
    {
        TLS.EdgeList[NumEdges][0] = i;     /* first vertex of edge */
        TLS.EdgeList[NumEdges][1] = j;     /* second vertex of edge */
        
        // ...
    }
}

我收到 EdgeList 未初始化的运行时错误。我最好的猜测是我没有正确使用运行时设置长度的二维数组。

Answer 1

在你的构造函数中，你正在做：

int[,] EdgeList = new int[(arrayLength * arrayLength), 2];

创建一个与字段同名的新（本地）变量。相反，你应该这样做：

this.EdgeList = new int[(arrayLength * arrayLength), 2];

你可以省略this，但它可以防止你再次犯同样的错误。

此外，您应该将字段声明更改为

public int[,] EdgeList

然后您可以通过以下方式设置数组中的各个字段：

 EdgeList[i,j] = value;

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