Console Based Application: Stream Read [HELP!]

the asker

Hi! please help, how am i going to sort the notepad file that i read using streamReader?
Like for exaxmple the file goes like this:
smith, 96
williams, 98
Davis, 64

then the output when the option is in ascending order.
Surname:        Grade:
Davis                64
Smith               96
Williams            98

how am i going to read each file and sort them when they are sepparated with commas?

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes14y ago
Accepted answer
Here's one way to do it:

using System;
using System.IO;
using System.Collections.Generic;

class Student : IComparable
{
public string Surname { get; set; }
public int Grade { get; set; }

public Student(string surname, int grade)
{
Surname = surname;
Grade = grade;
}

public int CompareTo(Student other)
{
return this.Grade - other.Grade;
}

public override string ToString()
{
return String.Format("{0,-12} {1,3}", Surname, Grade);
}
}

class Program
{
static void Main()
{
List students = new List();
StreamReader sr = new StreamReader("asker.txt");
string line;

while( (line = sr.ReadLine()) != null)
{
string[] fields = line.Split(',');
students.Add(new Student(fields[0], int.Parse(fields[1])));
}

sr.Close();
students.Sort();

Console.WriteLine(String.Format("{0,-12} {1}", "Surname:", "Grade:"));
foreach(Student s in students) Console.WriteLine(s);
Console.ReadKey();
}
}
Sam Hobbs14y ago
Vulpes, it does not help beginners to learn if you do everything for them. I truly believed that, and the members in this web site are not learning how to do things themselves.
Sam Hobbs14y ago
That is not a Notepad file format. There is no such thing as a Notepad file format. Notepad reads and writes text files and there is nothing special about the text fiels that Notepad reads and writes.

The file you are asking about is a Comma Separated Value (CSV) file. There are a few articles in this web site about CSV files; I wrote one of them.

What I would do is to start by writing a program that opens the file using StreamReader then uses the StreamReader.ReadLine Method to read each line until the end of the file. I would just write each input record to the console. That way I know I have that much working. I truly do do things like that to get started on something. Then you could solve the problem of how to split each line into Surname and Grade. Then I would figure out how to format the data.

So there are at least three separate tasks. Solve the problem buy doing each one separately. There are plenty of samples and articles to help you with use of the StreamReader class.