C#学生管理系统/学习
题目：
实现一个菜单，针对Student.txt与Class.txt文件进行操作
描述：
I 输入学生信息：输入学生学号、姓名、性别、出生日期、班级名称、联系电话，跟已经存在的学生信息同样格式保存在文件中。如果学号重复，则提示“学号重复，无法插入”
L 显示所有学生：每个学生的信息占一行；每个学生的信息项包括学号、姓名、性别、出生日期、班级名称、联系电话，各项以Tab分隔
C 按班级查询：输入班级名称，显示学生详细信息，包括学号、姓名、性别、联系电话，各项以Tab分隔。多人分行显示。
N 按姓名查询：输入学生姓名，显示学生详细信息，包括学号、姓名、性别、出生日期、班级名称、联系电话，各项以Tab分隔。多人分行显示。
X 退出系统：程序退出
总结：
主要是对文件进行操作。没什么好说的。
1 using System; 2 using System.Collections; 3 using System.Collections.Generic; 4 using System.IO; 5 using System.Text; 6 7 namespace NET第二次作业 8 { 9 public class Student 10 { 11 public String num; 12 public String name; 13 public String sex; 14 public String date_of_birth; 15 public String classId; 16 public String className; 17 public String telephone; 18 } 19 public class myClass 20 { 21 public String id; 22 public String classname; 23 } 24 class MyFourTest 25 { 26 static List<Student> students = new List<Student>(); 27 static List<myClass> myClasss = new List<myClass>(); 28 public static void Init() 29 { 30 31 List<String> student_p = new List<string>(); 32 StreamReader student = new StreamReader("C:\\Users\\a1191\\Desktop\\student.txt", Encoding.Default); 33 34 while (!student.EndOfStream) 35 { 36 student_p.Add(student.ReadLine()); 37 // Console.WriteLine(student_p[i++]+"a"); 38 } 39 for(int j=0; j<student_p.Count; j++) 40 { 41 string[] arr = student_p[j].Split(','); 42 if(arr[0]!="") 43 { 44 Student student1 = new Student(); 45 student1.num = arr[0]; 46 student1.name = arr[1]; 47 student1.sex = arr[2]; 48 student1.date_of_birth = arr[3]; 49 student1.classId = arr[4]; 50 student1.telephone = arr[5]; 51 students.Add(student1); 52 } 53 54 } 55 student.Close(); 56 57 StreamReader streamReader = new StreamReader("C:\\Users\\a1191\\Desktop\\class.txt", Encoding.Default); 58 while (!streamReader.EndOfStream) 59 { 60 String class_ = streamReader.ReadLine(); 61 string[] arr = class_.Split(','); 62 myClass t = new myClass(); 63 t.classname = arr[1]; 64 t.id = arr[0]; 65 myClasss.Add(t); 66 for(int i=0; i<students.Count; i++) 67 { 68 if(students[i].classId.Equals(arr[0])) 69 { 70 students[i].className = arr[1]; 71 //Console.WriteLine(arr[0]); 72 } 73 } 74 } 75 streamReader.Close(); 76 } 77 78 public static void saveInfo(Student t) 79 { 80 StreamWriter student = new StreamWriter("C:\\Users\\a1191\\Desktop\\student.txt", true); 81 //StreamWriter streamReader = new StreamWriter("C:\\Users\\a1191\\Desktop\\class.txt", true); 82 String s = t.num + ',' + t.name + ',' + t.sex + ',' + t.date_of_birth + ',' + t.classId + ',' + t.telephone; 83 student.WriteLine(s); 84 //String c = t.classId + ',' + t.className + ",2005"; 85 //streamReader.WriteLine(c); 86 student.Close(); 87 //streamReader.Close(); 88 } 89 public static void InputStudentInfo() 90 { 91 Student t = new Student(); 92 Console.WriteLine("请输入学号："); 93 t.num = Console.ReadLine(); 94 for(int i=0; i<students.Count; i++) 95 { 96 if(t.num.Equals(students[i].num)) 97 { 98 Console.WriteLine("学号重复，无法插入"); 99 return; 100 } 101 } 102 Console.WriteLine("请输入姓名："); 103 t.name = Console.ReadLine(); 104 Console.WriteLine("请输入性别："); 105 t.sex = Console.ReadLine(); 106 Console.WriteLine("请输入出生日期："); 107 t.date_of_birth = Console.ReadLine(); 108 Console.WriteLine("请输入班级名称："); 109 t.className = Console.ReadLine(); 110 Console.WriteLine("请输入联系电话："); 111 t.telephone = Console.ReadLine(); 112 for(int i=0; i<myClasss.Count; i++) 113 { 114 if(t.className.Equals(myClasss[i].classname)) 115 { 116 t.classId = myClasss[i].id; 117 } 118 } 119 students.Add(t); 120 //for(int i=0; i<students.Count; i++) 121 //{ 122 // Console.WriteLine(students[i].className); 123 //} 124 125 saveInfo(t); 126 } 127 public static void ShowAllStudent() 128 { 129 Console.WriteLine("学号\t姓名\t性别\t出生日期\t班级名称\t\t联系电话"); 130 for(int i=0; i<students.Count; i++) 131 { 132 Console.WriteLine(students[i].num + "\t"+ students[i].name + "\t"+ students[i].sex + 133 "\t"+ students[i].date_of_birth + "\t"+ students[i].className + "\t" +students[i].telephone); 134 } 135 } 136 public static void GetStudentByClass() 137 { 138 Console.WriteLine("请输入要查询的班级名称："); 139 String name = Console.ReadLine(); 140 Console.WriteLine("学号\t姓名\t性别\t联系电话"); 141 for (int i = 0; i < students.Count; i++) 142 { 143 if(students[i].className.Equals(name)) 144 { 145 Console.WriteLine(students[i].num + "\t" + students[i].name + "\t" + students[i].sex + 146 "\t" + students[i].telephone); 147 } 148 } 149 } 150 public static void GetStudentByName() 151 { 152 Console.WriteLine("请输入要查询的学生姓名："); 153 String name = Console.ReadLine(); 154 Console.WriteLine("学号\t姓名\t性别\t出生日期\t班级名称\t\t联系电话"); 155 for (int i = 0; i < students.Count; i++) 156 { 157 if (students[i].name.Equals(name)) 158 { 159 Console.WriteLine(students[i].num + "\t" + students[i].name + "\t" + students[i].sex + 160 "\t" + students[i].date_of_birth + "\t" + students[i].className + "\t" + students[i].telephone); 161 } 162 } 163 } 164 165 public static void StudentTest() 166 { 167 168 Init(); 169 while (true) 170 { 171 ConsoleKeyInfo cmd; 172 Console.WriteLine("欢迎使用学生管理系统\n"); 173 Console.WriteLine("I 输入学生信息\n"); 174 Console.WriteLine("L 显示所有学生\n"); 175 Console.WriteLine("C 按班级查询\n"); 176 Console.WriteLine("N 按姓名查询\n"); 177 Console.WriteLine("X 退出系统\n"); 178 cmd = Console.ReadKey(); 179 Console.WriteLine(""); 180 switch (cmd.KeyChar) 181 { 182 case 'I': 183 InputStudentInfo(); 184 break; 185 case 'L': 186 ShowAllStudent(); 187 break; 188 case 'C': 189 GetStudentByClass(); 190 break; 191 case 'N': 192 GetStudentByName(); 193 break; 194 case 'X': 195 System.Environment.Exit(0); 196 break; 197 default: 198 Console.WriteLine("\n请输入指定字符（区分大小写）\n"); 199 break; 200 } 201 Console.ReadKey(); 202 Console.Clear(); 203 } 204 205 206 } 207 208 } 209 }
