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static void Main(string[] args)
{
var a = new List<departModel>()
{
new departModel(){claNo = 1, stuNo = 1},
new departModel(){claNo = 1, stuNo = 2},
new departModel(){claNo = 1, stuNo = 3}
};
//查询
var query =
from p in a
group p by p.claNo;
foreach (var item in query)
{
Console.WriteLine("{0} => {1}", item.Key, string.Join(",", item.Select(x=>x.stuNo)));
}
//方法
var q =
a
.GroupBy(p => p.claNo);
foreach (var item in q)
{
Console.WriteLine("{0} => {1}", item.Key, string.Join(",", item.Select(x => x.stuNo)));
}
}