c# 随机函数

Question

太多了，懒的看，把最主要的问题表示出来。

Answer 1

//举一个例子给你
List<string> student = new List<string>();
            List<string> teacher = new List<string>();
            List<string> result = new List<string>();
            student.AddRange(new string[] { "A1","B1","C1","D1","E1"});
            teacher.AddRange(new string[] { "A", "B", "C", "D", "E" });
            for (int i = 0; i < student.Count; i++)
            {
                bool isFindSelt = false;
                if(teacher.Contains(student[i].Substring(0,1)))
                {
                    teacher.Remove(student[i].Substring(0, 1));
                    isFindSelt = true;
                }
                Random rand = new Random();
                int index = rand.Next(0, teacher.Count - 1);
                string s = teacher[index];
                teacher.RemoveAt(index);
                if (isFindSelt)
                    teacher.Add(student[i].Substring(0, 1));
                result.Add(student[i] + "--" + s);
            }
            for (int i = 0; i < result.Count ; i++)
            {
                System.Windows.Forms.MessageBox.Show(result[i].ToString());
            }