Convert a IList<T> collection to a comma separated list

网上资料 ：

// Given: IList<int> collection; string commaSeparatedInts = string.Join(",",collection.Select(i => i.ToString()).ToArray());

我自己的：

1.ShopWebInfo：

[Serializable]
    public class ShopWebInfo
    {
        /// <summary>
        /// 商城商品ID
        /// </summary>
        public int ShopProductID { get; set; }

        /// <summary>
        /// 商品BaseID
        /// </summary>
        public int ProductBaseID { get; set; }

        /// <summary>
        /// 网店ID
        /// </summary>
        public int CompanyID { get; set; }

        /// <summary>
        /// 网店名称
        /// </summary>
        public string CompanyName { get; set; }

        /// <summary>
        /// 销售价格
        /// </summary>
        public decimal SalePrice { get; set; }

        /// <summary>
        /// 赠送积分
        /// </summary>
        public int Score { get; set; }

        /// <summary>
        /// 库存剩余
        /// </summary>
        public int StockNum { get; set; }
    }

2.

IList<ShopWebInfo> lstShopWebInfo = new List<ShopWebInfo>();

string[] lstShopID = lstShopWebInfo.Select(i => i.CompanyID.ToString()).ToArray();
string strShopIDList = string.Join(",",lstShopID);