由于excel文件的最后一列包含一个整数，因此您可以使用条件结构来检查当前索引处的数组成员是否包含一个数字，使用Int32.TryParse()，然后将该项目和换行符追加到csv中，否则将该项目和逗号追加，如下面的代码所示。

var array = new string[]
{
    "Food","Candy","15",
    "System","IOS, Android","2023",
    "Fruit","Apple, Orange","100",
    "Wine","Whisky","250"
};
//create a new list to hold the items
var myList = new List<string>();
//copy the items from the array to the list
myList.AddRange(array);
//create the csv file if it does not exist
if (!File.Exists("items.csv"))
{
    File.Create("items.csv");
}
//open the file with a stream writer for editing
using (var streamWriter = new StreamWriter("items.csv"))
{
    foreach (var item in myList)
    {
        if (Int32.TryParse(item, out var res))
        {
            //append the item to the file and a line break
            streamWriter.Write(item+"\n");
        }
        else
        {
            //replace the comma in the current string with space
            var str = item.Replace(",", " ");
            //append the item and a comma
            streamWriter.Write(str+",");
        }
    }
}

检查以下文件item.csv的excel输出。