如何把List<T>追加到另一个List<T>中

Question

List<ExamLog> examlogList = null;
                    if (string.IsNullOrEmpty(userNmaeF))
                    {
                        examlogList = ExamControlManager.GetExamLogsByArrangeID(arrangeID, userNmaeF, teacherID, TypeIDs[typeid].ToString(), start, limit, out count);
                    }
                    else
                    {
                        for (int i = 0; i < userIDs.Length;i++ )
                        {
                            if (userIDs[i].ToString() == arrange.AdminUserID.ToString())
                            {
                                studentID = "";
                                List<ExamLog> examlogRange = ExamControlManager.GetExamLogsByArrangeID(arrangeID, studentID, teacherID, TypeIDs[typeid].ToString(), start, limit, out count);                                examlogList.AddRange(examlogRange);
                            }
                            else
                            {
                                List<ExamLog> examlogRange = ExamControlManager.GetExamLogsByArrangeID(arrangeID, userIDs[i], teacherID, TypeIDs[typeid].ToString(), start, limit, out count);
                                examlogList.AddRange(examlogRange);
                            }
                        }  
                    }
这么追加报错 说是没把当前引用添加的对象的实例 
各位大侠 请问该怎么追加啊

Answer 1

examlogList  为null好像就不行

Answer 2

那就判断下 examlogRange 是否为null 再加呀

Answer 3

List<ExamLog> examlogList = new List<ExamLog>();

Answer 4

晕 试了一下List<ExamLog> examlogList = new List<ExamLog>();就可以了

Answer 5

new List<ExamLog>();
没初始化
就直接赋值了！！！