List 分组求和

[liushengpiaoxu]

现有要转换的集合：

  List<TestData> list = new List<TestData>();
            list.Add(new TestData() {  Name="A", Count=3});
            list.Add(new TestData() { Name = "A", Count = 3 });
            list.Add(new TestData() { Name = "b", Count = 3 });
            list.Add(new TestData() { Name = "b", Count = 3 });           
            list.Add(new TestData() { Name = "b", Count = 5 });

转换结果：
Name="A" Count=6
Name="B" Count=11

[wuyq11]

var q=from item in lst
group item by item into g
select new {str=g.key,number=g.Count()}