C#中填充矩形数组的扩展方法

public static class ExtensionMethods
{
    public static T[,] FillRectangularArray<T>(this T[,] array, T value)
    {
        int rows = array.GetLength(0);
        int columns = array.GetLength(1);

        for (int i = 0; i< rows; i++)
        {
            for (int j = 0; j< columns; j++)
            {
                array[i, j] = value;
            }
        }

        return array;
    }
}

int[,] myArray = new int[3, 4];
myArray = myArray.FillRectangularArray(5);

for (int i = 0; i < myArray.GetLength(0); i++)
{
    for (int j = 0; j < myArray.GetLength(1); j++)
    {
        Console.Write(myArray[i, j] + " ");
    }
    Console.WriteLine();
}

5 5 5 5
5 5 5 5
5 5 5 5