c#對List或ListArray或string組數 用linq進行分組統計

我這里以用的是list，別的類型都差不多一樣。。

（測試數據自己添加)

第一種 

List<string> AllList = new List<string>();

var q = from p in AllList group p by p into g select new { Key = g.Count(), BranchName = g.Key };

foreach (var v in q)

Console.WriteLine("--" + v.BranchName.ToString() + "--" + v.Key.ToString());

 

第二種 

List<string> AllList = new List<string>();

var q1 = from p in AllBranchList group p by new { g = p } into g select new { Key = g.Count(), BranchName = g.FirstOrDefault() };

foreach (var v in q1)
Console.WriteLine("==" + v.BranchName.ToString() + "--" + v.Key.ToString());