我有一個 groupby 函式，它在選擇中創建一系列列。對于一個列，我想回傳保存在該列標題下的欄位的結果陣列，但我似乎無法弄清楚如何在 linq 中撰寫此查詢。
示例代碼
var res = students.GroupBy(x => x.ClassId).Select(a => new {
ClassHours = a.Sum(r => r.Hours),
AvgAttendance = a.Average(r => r.AttendanceRate),
NumStudents = a.Count(),
// I want to get a list of all student names but not sure how to do this,
I want a array return of student names, I tried with for each but this doesn't seem to work but I'm not sure what to do
StudentNames = a.ForEach(r => return r.StudentName)
// I want to do something like this but make the rest a array e.g. StudentNames = ["Blaise", "Sasha", "Jeff"]
});
uj5u.com熱心網友回復：
如果不知道你的物件是什么樣子就很難確定，但大概你可以使用Select?
StudentNames = a.Select(r => r.StudentName).ToArray()
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