C# 我如何使用LINQ来总结这些数据——按关系数分组的关系数

我有一张简单的桌子，像：

| fkId | Item | --------------- | 1 | A | | 1 | B | | 1 | C | | 1 | D | | 2 | H | | 2 | I | | 3 | Y | | 3 | Z |

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您使用

.GroupBy

完成了一半-现在您必须应用另一个

.GroupBy

来完成其余操作：

MyTable.GroupBy(i => i.FkID)
       .GroupBy(group => group.Count())
       .Select(group => new { ItemCount = group.Key,
                              FkIdsWithItemCount = group.Count() });

MyTable
    .GroupBy(i => i.FkID)
    .Select(i => i.Count())

MyTable.GroupBy(i => i.FkID)
       .GroupBy(group => group.Count())
       .Select(group => new { ItemCount = group.Key,
                              FkIdsWithItemCount = group.Count() });