C#下的学生信息管理程序_.NET教程_编程技术
using System;
using System.Collections;
using System.IO;
namespace SEI.DL88250.SourceCodes.CSharp
{
public interface IStudent
{
// Properties
string ID
{
get;
set;
}
string Name
{
get;
set;
}
string Gender
{
get;
set;
}
string ClassNum
{
get;
set;
}
string Specialty
{
get;
set;
}
string BDay
{
get;
set;
}
}
public interface IStudentIMP
{
// Methods
// Add a new student's info into ArrayList
void AddInfo();
// Print out all students' info to console
void DisplayInfo();
// Delete a student's info
void DropInfo();
// Save all students' info into disk
void SaveFile();
// Search a student's info by ID
// If find info return the student's ID hash code,
// otherwise return reserved ID(20051120000) hash code
int SearchInfo(string ID);
}
class Student
{
// Fields
private string _ID;
private string _name;
private string _gender;
private string _classNum;
private string _specialty;
private System.DateTime _bday;
// Properties
public string ID
{
get
{
return _ID;
}
set
{
_ID = value;
}
}
public string Name
{
get
{
return _name;
}
set
{
_name = value;
}
}
public string Gender
{
get
{
return _gender;
}
set
{
_gender = value;
}
}
public string ClassNum
{
get
{
return _classNum;
}
set
{
_classNum = value;
}
}
public string Specialty
{
get
{
return _specialty;
}
set
{
_specialty = value.ToString();
}
}
public string BDay
{
get
{
return _bday.ToShortDateString();
}
set
{
_bday = System.DateTime.Parse(value);
}
}
// Constructors
public Student(string id, string name, string gender,
string classNum, string specialty, string bday)
{
_ID = id;
_name = name;
_gender = gender;
_classNum = classNum;
_specialty = specialty;
_bday = System.DateTime.Parse(bday);
}
}
class StudentIMP : IStudentIMP
{
// Fileds
private static string[] _mainMenu; // function description
private static string[] _addInfo; // add info prompt
private static string[] _saveInfo; // save file prompt
private static string[] _modifyInfo; // modify menu prompt
private static string[] _helpInfo; // help infomation
private Hashtable _stdInfo; // store student info
// Consturctors
StudentIMP()
{
// initial some prompt info
_mainMenu = new string[]{
"1. Add",
"2. Modify",
"3. Drop",
"4. Save file",
"5. Display info",
"6. Help",
"7. Exit"
};
_helpInfo = new string[]{
"1. ID must unique.",
"2. Modify function can't change ID. If you want to change the ID, /n please drop this record and new one again.",
"3. Birthday format is keep to ISO standard."};
_addInfo = new string[]{
"Please type in some infomation of this student.",
"ID: ",
"Name: ",
"Gender: ",
"ClassNum: ",
"Specialty: ",
"Birthday(198x/xx/xx): "
};
_saveInfo = new string[]{
"Please input save file name: "
};
_modifyInfo = new string[]{
"Please choose the attribute you want to modify.",
"1. Name",
"2. Gender",
"3. ClassNum",
"4. Specialty",
"5. Birthday"
};
// initial storage space
this._stdInfo = new Hashtable();
}
// Indexers
public Student this[string ID]
{
get
{
if (_stdInfo.Contains(ID))
{// exists the student's info
return (Student)_stdInfo[ID];
}
else
{
return null;
}
}
}
// Methods
// Store student info into disk file
public void SaveFile()
{
string fileName;
Console.WriteLine(_saveInfo[0]);
fileName = Console.ReadLine();
StreamWriter fwriter = File.CreateText(fileName);
IEnumerator e = _stdInfo.GetEnumerator();
Student std;
fwriter.WriteLine("ID Name Gender Class Specialty Birthday");
while (e.MoveNext())
{
DictionaryEntry de = (DictionaryEntry)(e.Current);
std = (Student)de.Value;
fwriter.WriteLine("{0, -13}{1, -17}{2, -10}{3, -6}{4, -12}{5, -10}",
std.ID, std.Name,
std.Gender, std.ClassNum,
std.Specialty, std.BDay);
}
fwriter.WriteLine("/t/t/t/t/t/tStudents total: {0}", _stdInfo.Count);
fwriter.Close();
}
// Add a new student's info
public void AddInfo()
{
string ID, name, gender, classNum, specialty, bday;
Console.WriteLine(_addInfo[0]);
Console.WriteLine(_addInfo[1]);
ID = Console.ReadLine();
Console.WriteLine(_addInfo[2]);
name = Console.ReadLine();
Console.WriteLine(_addInfo[3]);
gender = Console.ReadLine();
Console.WriteLine(_addInfo[4]);
classNum = Console.ReadLine();
Console.WriteLine(_addInfo[5]);
specialty = Console.ReadLine();
Console.WriteLine(_addInfo[6]);
bday = Console.ReadLine();
Student tmpStd = new Student(ID, name, gender, classNum, specialty, bday);
_stdInfo.Add(tmpStd.ID, tmpStd); // store
}
// Search a student's info. Time complexity: O(n)
// If find info return ID hash code,
// otherwise return reserved hash code
public int SearchInfo(string ID)
{
if ((null != _stdInfo[ID])
&& (ID == ((Student)_stdInfo[ID]).ID))
{// find it
return _stdInfo[ID].GetHashCode();
}
else
{// no find
// return reserved ID hash code
return "20051120000".GetHashCode();
}
}
// Display all students' info
public void DisplayInfo()
{
if (0 == _stdInfo.Count)
{
Console.WriteLine("No student info!");
return;
}
IEnumerator e = _stdInfo.GetEnumerator();
Student std;
Console.WriteLine("ID Name Gender Class Specialty Birthday");
while (e.MoveNext())
{
DictionaryEntry de = (DictionaryEntry)(e.Current);
std = (Student)de.Value;
Console.WriteLine( "{0, -13}{1, -17}{2, -10}{3, -6}{4, -12}{5, -10}",
std.ID, std.Name,
std.Gender, std.ClassNum,
std.Specialty, std.BDay);
}
Console.WriteLine("/t/t/t/t/t/tStudents total: {0}", _stdInfo.Count);
}
// Delete a student's info
public void DropInfo()
{
Console.WriteLine("Please input the student's ID: ");
string ID = Console.ReadLine();
if ("20051120000".GetHashCode() == SearchInfo(ID))
{// no find
Console.WriteLine("No find!");
return;
}
else
{// find a student
Console.WriteLine("Confirm delete it? (Y/n)");
string confirm = Console.ReadLine();
if ("y" == confirm.ToLower())
{// delete it
_stdInfo.Remove(_stdInfo[ID]);
}
}
return;
}
// Modify a student's info
public void ModifyInfo()
{
Console.WriteLine("Please input the student's ID: ");
string ID = Console.ReadLine();
if ("20051120000".GetHashCode() == SearchInfo(ID))
{// no find
Console.WriteLine("No find!");
return;
}
else
{// find a student
Student std = (Student)_stdInfo[ID];
Console.WriteLine("ID Name Gender Class Specialty Birthday");
Console.WriteLine("{0, -13}{1, -17}{2, -10}{3, -6}{4, -12}{5, -10}",
std.ID, std.Name, std.Gender,
std.ClassNum, std.Specialty, std.BDay);
Console.WriteLine("Do you want to modify the info? (Y/n)");
string choice = Console.ReadLine();
if (choice.ToLower() == "n")
{// do not modify
return;
}
// display student's attributes
foreach (string att in _modifyInfo)
{
Console.WriteLine(att);
}
// select a attribute to modify
string attChoice = Console.ReadLine();
switch (attChoice)
{
case "1":
{
Console.WriteLine(_addInfo[2]);
std.Name = Console.ReadLine();
break;
}
case "2":
{
Console.WriteLine(_addInfo[3]);
std.Gender = Console.ReadLine();
break;
}
case "3":
{
Console.WriteLine(_addInfo[4]);
std.ClassNum = Console.ReadLine();
break;
}
case "4":
{
Console.WriteLine(_addInfo[5]);
std.Specialty = Console.ReadLine();
break;
}
case "5":
{
Console.WriteLine(_addInfo[6]);
std.BDay = Console.ReadLine();
break;
}
default:
{
Console.WriteLine("Functioin undefine!");
break;
}
}
}
}
// Main menu, display program functions
private static void MainMenu()
{
foreach (string func in _mainMenu)
{
Console.WriteLine(func);
}
}
[STAThread] // single-thread model
// Program entry point
static void Main()
{
Console.ForegroundColor = ConsoleColor.DarkGreen;
Console.Title = "Student IMP -Lab3 by 88250";
StudentIMP stdIMP = new StudentIMP();
string funcSelect;
do
{
Console.Clear();
MainMenu();
funcSelect = Console.ReadLine();
switch (funcSelect)
{
case "1":
{
stdIMP.AddInfo();
break;
}
case "2":
{
stdIMP.ModifyInfo();
break;
}
case "3":
{
stdIMP.DropInfo();
break;
}
case "4":
{
stdIMP.SaveFile();
break;
}
case "5":
{
stdIMP.DisplayInfo();
break;
}
case "6":
{
foreach (string hlpInfo in _helpInfo)
{
Console.WriteLine(hlpInfo);
}
break;
}
case "7":
{
return;
}
default:
{
Console.WriteLine("Function undefine!");
break;
}
}
Console.WriteLine("Press any key to continue....");
Console.ReadLine();
}
while (true);
}
}
}
