将IEnumerable <IGrouping<,>>转换为数组

Question

是否有将以下代码中的remaining转换为1-D数组的简单方法。

var groups = data.OrderBy(d => d.Time).GroupBy(d => d.Period); 
var first = groups.First().ToArray(); 
var remaining = groups.Skip(1).?? 

Answer 1

var remaining = groups.Skip(1).SelectMany(g=>g).ToArray(); 

Answer 2

使用SelectMany “平坦” 集合的集合：

var remaining = groups.Skip(1).SelectMany(d => d).ToArray();