C# List 对于某个字段去重复
gradeSubjectItem.teacher = teacherInfos.Where((x, i) => teacherInfos.FindIndex(z => z.guid == x.guid) == i).ToList();
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gradeSubjectItem.teacher = teacherInfos.Where((x, i) => teacherInfos.FindIndex(z => z.guid == x.guid) == i).ToList();