你好，我是一个新的程序员，我正在尝试格式化数组的方式，在一个特定的数组的结尾有一个换行符。我目前有4个单独的数组，我想在其中排列数组中的每个项到一个特定的模式。我已经完成了这项任务，但现在我被难倒了，因为他们都在一条线上。让我给你举个例子：（顺便说一下，我在datagridview上这样做）

(This is what I want to happen)
Binder Clips Small  pc      12         1260
Selleys All Clear   pc      12         2400

(This is what I am getting)

Binder Clips Small  pc      12          1260        Selleys All Clear      pc    12     2400 

这是我的代码：

//I get these from a datagridview
            var items = carto.Rows
            .Cast<DataGridViewRow>()
            .Select(x => x.Cells[1].Value.ToString().Trim())
            .ToArray();

            var units = carto.Rows
            .Cast<DataGridViewRow>()
            .Select(x => x.Cells[2].Value.ToString().Trim())
            .ToArray();

            var quantity = carto.Rows
            .Cast<DataGridViewRow>()
            .Select(x => x.Cells[6].Value.ToString().Trim())
            .ToArray();

            var prices = carto.Rows
            .Cast<DataGridViewRow>()
            .Select(x => x.Cells[8].Value.ToString().Trim())
            .ToArray();

            //this is what I use to sort out the pattern that I want the arrays to be in
            string[] concat = new string[items.Length * 4];
            int index = 0;
            for (int i = 0; i < items.Length; i++)
            {
                concat[index++] = items[i];
                concat[index++] = units[i];
                concat[index++] = quantity[i];
                concat[index++] = prices[i];
            }

// and this is where I am stuck because I can just put \n, it would ruin the format even more
            cartitems.Text = string.Join(" ", concat); 

我也试着做了这样的事情：

            int j = 0;
            string str = "";

            foreach (var item in concat)
            {
                str += item;
                if (j <= concat.Length - 1)
                {
                    if (j % 3 == 0)
                        str += " ";
                    else
                        str += "\n";
                }
                j++;
            }

这就总结了我的问题，我真的希望你能帮助一个像我这样的新手，我有一种感觉，答案很简单，我只是没有经验。