C#数组维度转换：一维数组&二维数组&三维数组相互转换

最近项目需要用到数组维度转换，网上资源较少，写一个分享与备用

1.一维数组转二维数组

/// <summary>
/// 一维数组转2维数组(矩阵)
/// </summary>
/// <param name="obj"></param>
/// <param name="len">矩阵行数</param>
/// <returns></returns>
public static T[,] OneD_2<T>(T[] obj,int len)
{
    if (obj.Length % len != 0)
        return null;
    int width = obj.Length / len;
    T[,] obj2 = new T[len, width];
    for (int i = 0; i < obj.Length; i++)
    {
        obj2[i / width, i % width] = obj[i];
    }
    return obj2;
}

2.一维数组转三维数组

/// <summary>
/// 一维数组转3维数组
/// </summary>
/// <param name="obj"></param>
/// <param name="len">一维长</param>
/// <param name="wid">二维长</param>
/// <returns></returns>
public static T[,,] OneD_3<T>(T[] obj,int len,int wid)
{
    if (obj.Length % (len* wid) != 0)
        return null;
    int height = obj.Length / (len * wid);
    T[,,] obj2 = new T[len, wid, height];

    for (int i = 0; i < obj.Length; i++)
    {
        //核心思想把握每个维度的值多久变一次与设置最大值，变化频率设置用除法，设置最大值用求余
        //第二及之后的维度最大值为自身维度最大值 -1（意思就是最后需要对自身维度最大值求余）
        obj2[i / (wid* height), (i / height) % wid, i % height] = obj[i];
    }
    return obj2;
}

3.二维数组转一维数组

/// <summary>
/// 二维数组转一维数组
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static T[] TwoD_1<T>(T[,] obj)
{
    T[] obj2 = new T[obj.Length];
    for (int i = 0; i < obj.Length; i++)
        obj2[i] = obj[i / obj.GetLength(1), i % obj.GetLength(1)];
    return obj2;
}

4.三维数组转一维数组

/// <summary>
/// 三维数组转一维数组
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static T[] ThreeD_1<T>(T[,,] obj)
{
    T[] obj2 = new T[obj.Length];
    int wid = obj.GetLength(1);//GetLength从0开始
    int height = obj.GetLength(2);
    for (int i = 0; i < obj.Length; i++)
        obj2[i] = obj[i / (wid * height), (i / height) % wid, i % height];
    return obj2;
}