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public static void QuaryClassList(out List<string> AllClassList)
{
DataTable myDataTable = OriginalDS.Tables[0];
var ClassQuary =
from tempRow in myDataTable.AsEnumerable()
select tempRow.Field<string>("班级").Distinct();
AllClassList = ClassQuary.ToList(); //这段代码会出问题,因为无法进行类型转换
}