Question

如何将逗号分隔的字符串添加到ArrayList？我的字符串可能包含1个或多个我想要添加到ArrayList的项目，每个项目都与它自己的id值组合，用下划线（_）分隔，所以它必须是分开的arraylist项目..

例如：

string supplierIdWithProducts = "1_1001,1_1002,20_1003,100_1005,100_1006";

ArrayList myArrayList= new ArrayList();
myArrayList.Add("1001,1002"); // 1
myArrayList.Add("1003"); // 20
myArrayList.Add("1005,1006"); // 100

填充ArrayList后，我想将它传递给Web服务那部分对我来说还可以 foreach (string item in myArrayList){}

我怎么能这样做......

谢谢..

Answer 1

string supplierIdWithProducts = "1_1001,1_1002,20_1003,100_1005,100_1006";

var lookup = 
     supplierIdWithProducts.Split(',')
                           .ToLookup(id => id.Split('_')[0],
                                     id => id.Split('_')[1]);

foreach (var grp in lookup)
{
    Console.WriteLine("{0} - {1}", grp.Key, string.Join(", ", grp));
}

将打印：

1 - 1001, 1002
20 - 1003
100 - 1005, 1006

Answer 2

首先，我建议您尝试使用Dictionary或任何其他泛型集合而不是ArrayList来使其类型安全。然后使用string.Split（char c）并从那里开始处理。

以下是关于如何做到这一点的想法。当然，扩展方法可能会缩短。但这只是一个关于如何做到这一点的思考过程。

    static void ParseSupplierIdWithProducts()
    {
        string supplierIdWithProducts = "1_1001,1_1002,20_1003,100_1005,100_1006";

        //eg. [0] = "1_1001", [1] = "1_1002", etc
        List<string> supplierIdAndProductsListSeparatedByUnderscore = supplierIdWithProducts.Split(',').ToList();

        //this will be the placeholder for each product ID with multiple products in them
        //eg. [0] = key:"1", value(s):["1001", "1002"]
        //    [1] = key:"20", value(s):["1003"]
        Dictionary<string, List<string>> supplierIdWithProductsDict = new Dictionary<string, List<string>>();

        foreach (string s in supplierIdAndProductsListSeparatedByUnderscore)
        {
            string key = s.Split('_')[0];
            string value = s.Split('_')[1];

            List<string> val = null;

            //look if the supplier ID is present
            if (supplierIdWithProductsDict.TryGetValue(key, out val))
            {
                if (val == null)
                {
                    //the supplier ID is present but the values are null
                    supplierIdWithProductsDict[key] = new List<string> { value };
                }
                else
                {
                    supplierIdWithProductsDict[key].Add(value);
                }
            }
            else
            {
                //that supplier ID is not present, add it and the value/product
                supplierIdWithProductsDict.Add(key, new List<string> { value });
            }
        }
    }

将逗号分隔的字符串添加到ArrayList c＃

2 个答案: