c# - 使用 GroupBy 和 Average 将 SQL 转换为 lambda LINQ

Question

我花了几个小时尝试将简单的 SQL 转换为 lambda LINQ

SELECT ID, AVG(Score) FROM myTable
GROUP BY ID

有什么想法吗？

Answer 1

from t in myTable
group t by new {
  t.ID
} into g
select new {
  Average = g.Average(p => p.Score),
  g.Key.ID
}

或Lambda

myTable.GroupBy(t => new  {ID = t.ID})
   .Select (g => new {
            Average = g.Average (p => p.Score), 
            ID = g.Key.ID 
         })