编辑“︁C Sharp LINQ 分组（Grouping）”︁（章节）

=== 示例：按班级和分数段分组 ===
<syntaxhighlight lang="csharp">
var multiKeyGroups = students.GroupBy(s => new
{
    s.Class,
    ScoreRange = s.Score >= 90 ? "High" : s.Score >= 80 ? "Medium" : "Low"
});

foreach (var group in multiKeyGroups)
{
    Console.WriteLine($"Class {group.Key.Class}, Score Range: {group.Key.ScoreRange}");
    foreach (var student in group)
    {
        Console.WriteLine($"- {student.Name}, Score: {student.Score}");
    }
}
</syntaxhighlight>

'''输出：'''
<pre>
Class 1, Score Range: Medium
- Alice, Score: 85
Class 1, Score Range: Low
- Charlie, Score: 78
Class 2, Score Range: High
- Bob, Score: 90
- David, Score: 92
Class 3, Score Range: Medium
- Eve, Score: 88
</pre>