IList<Test> tlist = new List<Test>(); tlist.Add(new Test() {Key="A",Value=15 }); tlist.Add(new Test() { Key = "B", Value = 10 }); tlist.Add(new Test() { Key = "A", Value = 5 }); tlist.Add(new Test() { Key = "B", Value = 6 }); var rst = (from t in tlist group t by t.Key into tt select new {k= tt.Key, r=tt.Sum(x => x.Value) }).ToList(); 这种效果?
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