Liststring[] 如何去重

List<string[]> 如何去重，代码如下:

static void Main(string[] args){List<string[]> list = new List<string[]>();list.Add(new string[] { "1", "2", "3" });list.Add(new string[] { "1" });list.Add(new string[] { "1", "2", "3" });list.Add(new string[] { "1" });list.Add(new string[] { "1" });List<string> strList = new List<string>();foreach (var item in list){string s = string.Join(",", item);strList.Add(s);}//要删除的元素的下标集合List<int> removeIndexList = new List<int>();if (list.Count >= 2)  //确保下标i不越界
            {string currentStr = string.Empty;for (int i = 0; i < strList.Count; i++){currentStr = strList[i];for (int j = i + 1; j < strList.Count; j++){if (currentStr == strList[j]){//添加到要删除的索引集合removeIndexList中
                            removeIndexList.Add(j);}}}removeIndexList = removeIndexList.Distinct().ToList();////去除重复的索引//添加到要删除的对象集合List<string[]> removeList = new List<string[]>();foreach (var index in removeIndexList){removeList.Add(list[index]);}//遍历要删除对象的集合，删除原集合中的对象foreach (var item in removeList){list.Remove(item);}foreach (var item in list){string s = string.Join(",", item);Console.WriteLine(s);}Console.ReadKey();}}

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运行截图如下：

那么问题又来了，挖掘机技术……呸！如果是List<List<string[]>>的集合又该如何去重呢？

原理是一样的把List<string[]>变成字符串，装到List<string>中，根据List<sting>重复的元素的下标索引，删除原集合中重复的元素，

代码如下:

 static void Main(string[] args){List<string[]> list = new List<string[]>();list.Add(new string[]{"1","2","3"});list.Add(new string[] { "1","2" ,"3"});list.Add(new string[] { "1" });list.Add(new string[] { "1" });list.Add(new string[] { "1" });List<string[]> list2 = new List<string[]>();list2.Add(new string[] { "1", "2", "3", "4", "5" });list2.Add(new string[] { "1", "2", "3" });list2.Add(new string[] { "1" });list2.Add(new string[] { "1" });list2.Add(new string[] { "1" });List<string[]> list3 = new List<string[]>();list3.Add(new string[] { "1", "2", "3" });list3.Add(new string[] { "1", "2", "3" });list3.Add(new string[] { "1" });list3.Add(new string[] { "1" });list3.Add(new string[] { "1" });List<string[]> list4= new List<string[]>();list4.Add(new string[] { "1", "2", "3", "4", "5" });list4.Add(new string[] { "1", "2", "3" });list4.Add(new string[] { "1" });list4.Add(new string[] { "1" });list4.Add(new string[] { "1" });List<List<string[]>> superList = new List<List<string[]>>();//集合list和集合list3是相同，list2和list4相同，并且list4添加了2次
            superList.Add(list);superList.Add(list2);superList.Add(list3);superList.Add(list4);superList.Add(list4);List<string> strList = new List<string>();foreach (var d in superList){StringBuilder sb = new StringBuilder();foreach (var dd in d){string s = string.Join(",", dd);sb.Append(s);}string str = sb.ToString();strList.Add(str); //把superList中每个子元素拼接成一条字符串放到strList中
            }//要删除的元素的下标集合List<int> removeIndexList = new List<int>();if (strList.Count >= 2) //有2个以上的元素才有可能出现重复
            {string currentStr = string.Empty;for (int i =0; i < strList.Count; i++){currentStr = strList[i];for (int j =i+1; j < strList.Count; j++){if (currentStr == strList[j]){//添加到要删除的索引集合removeIndexList中
                            removeIndexList.Add(j);}}}}removeIndexList = removeIndexList.Distinct().ToList();//去除重复的索引//要删除的对象集合List<List<string[]>> superRemoveList = new List<List<string[]>>();foreach (var index in removeIndexList){superRemoveList.Add(superList[index]);}foreach (var item in superRemoveList){superList.Remove(item);}Console.WriteLine(superList.Count());Console.ReadKey();}