最近專案需要用到陣列維度轉換，網上資源較少，寫一個分享與備用

1.一維陣列轉二維陣列

/// <summary>
/// 一維陣列轉2維陣列(矩陣)
/// </summary>
/// <param name="obj"></param>
/// <param name="len">矩陣行數</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;
}

2.一維陣列轉三維陣列

/// <summary>
/// 一維陣列轉3維陣列
/// </summary>
/// <param name="obj"></param>
/// <param name="len">
 
一維長</param>
/// <param name="wid">二維長</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++)
    {
        //核心思想把握每個維度的值多久變一次與設定最大值，變化頻率設定用除法，設定最大值用求餘
        //第二及之後的維度最大值為自身維度最大值 -1（意思就是最後需要對自身維度最大值求餘）
        obj2[i / (wid* height), (i / height) % wid, i % height] = obj[i];
    }
    return obj2;
}

3.二維陣列轉一維陣列

/// <summary>
/// 二維陣列轉一維陣列
/// </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;
}

4.三維陣列轉一維陣列

/// <summary>
/// 三維陣列轉一維陣列
/// </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從0開始
    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;
}