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);
}
}
}
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