【C#】多次元配列をコピーする拡張メソッド

public static T[,] Copy<T>(this T[,] self)
{
    var dst = new T[self.GetLength(0), self.GetLength(1)];
    for (var a = 0; a < self.GetLength(0); a++)
        for (var b = 0; b < self.GetLength(1); b++)
            dst[a, b] = self[a, b];
    return dst;
}
 
public static T[,,] Copy<T>(this T[,,] self)
{
    var dst = new T[self.GetLength(0), self.GetLength(1), self.GetLength(2)];
    for (var a = 0; a < self.GetLength(0); a++)
        for (var b = 0; b < self.GetLength(1); b++)
            for (var c = 0; c < self.GetLength(2); c++)
                dst[a, b, c] = self[a, b, c];
    return dst;
}