C# linq 实现Rank Over Partition by
作者：互联网
public class TData
{
public int Id { get; set; }
public string StuName { get; set; }
public string ClsName { get; set; }
public decimal Score { get; set; }
}
public class ToolTest
{
[Fact]
public void Test()
{
var list = new List<TData>
{
new TData() { Id = 1, StuName = "zhangsan", ClsName = "1", Score = 70 },
new TData() { Id = 2, StuName = "lisi", ClsName = "1", Score = 80 },
new TData() { Id = 3, StuName = "wangwu", ClsName = "1", Score = 90 },
new TData() { Id = 4, StuName = "liaoliu", ClsName = "1", Score = 100 },
new TData() { Id = 5, StuName = "zhangsan", ClsName = "2", Score = 90 },
new TData() { Id = 6, StuName = "lisi", ClsName = "2", Score = 40 },
new TData() { Id = 7, StuName = "wangwu", ClsName = "2", Score = 50 },
new TData() { Id = 8, StuName = "liaoliu", ClsName = "2", Score = 60 },
};
//var g = list.GroupBy(g => g.ClsName);
var resut1 = list.GroupBy(g => g.ClsName).Select(s => s.Select(s => s.Score).Max());
var resut2 = list.GroupBy(g => g.ClsName).Select(s => s.OrderByDescending(o => o.Score).FirstOrDefault());
}
}
标签：StuName,ClsName,C#,TData,Over,Partition,Score,new,Id 来源： https://www.cnblogs.com/hofmann/p/16640158.html