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C# How can I write console output to a file?

I need to get my console output to a text file also. How can this be possible with the following code? I hope that a routined person can help me out :-)
namespace MyProject
{
// Creating a class for salesmen
class Person
{
// Variables for the salesmen
public string name;
public long personNumber;
public string district;
public int soldArticles;
// Constructor for the class
public Person(string name, long personNumber, string district, int soldArticles)
{
this.name = name;
this.personNumber = personNumber;
this.district = district;
this.soldArticles = soldArticles;
}
// Method to read input from user about the salesmen
public static Person ReadSeller()
{
Console.Write("\nEnter name of the salesman: ");
string name = Console.ReadLine();
Console.Write("\nPlease enter person number: ");
long personNumber = long.Parse(Console.ReadLine());
Console.Write("\nPlease enter what district you operate in: ");
string district = Console.ReadLine();
Console.Write("\nPlease enter amount of sold articles: ");
int soldArticles = int.Parse(Console.ReadLine());
return new Person(name, personNumber, district, soldArticles);
}
}
class Program
{
static void Main(string[] args)
{
// prompt user to enter how many salesmen there are in the salesforce
Console.Write("\nHow many salesmen are you in the salesforce? ");
int numOfSalesmen = int.Parse(Console.ReadLine());
// List that holds the salesmen
List<Person> sellers = new List<Person>();
// for loop that will iterate through the given amount of salesmen
for (int i = 1; i <= numOfSalesmen; i++)
{
Console.WriteLine("\nPlease fill in data for salesman {0}", i);
sellers.Add(Person.ReadSeller());
Console.WriteLine("--------------------------------------------------");
}
// sort the list with bubblesort
SortByBubblesort(sellers);
// print the salesmen
PrintSalesmen(sellers);
}
// This method sorts the List Person with the bubblesort method from least to most sold articles.
static List<Person> SortByBubblesort(List<Person> sellers)
{
int timesNumbersChanged;
do
{
timesNumbersChanged = 0;
for (int i = 0; i < sellers.Count - 1; i++)
{
if (sellers[i].soldArticles > sellers[i + 1].soldArticles)
{
Person salesman = sellers[i];
sellers.RemoveAt(i);
sellers.Insert(i + 1, salesman);
timesNumbersChanged += 1;
}
}
} while (timesNumbersChanged != 0);
return sellers;
}
// This method prints the salesmen in the order of what level they belong to.
static List<Person> PrintSalesmen(List<Person> sellers)
{
// Constants & variables
const int LEVEL_ONE = 50;
const int LEVEL_TWO = 99;
const int LEVEL_THREE = 199;
const int LEVEL_FOUR = 200;
int count = 0;
// headline for the output
Console.WriteLine("{0,-20} {1,-20} {2,-10} {3,-10}", "Name", "Person number", "District", "Articles sold");
// Counts how many salesmen that belongs to level 1
foreach (Person salesman in sellers)
{
if (salesman.soldArticles < LEVEL_ONE)
{
count++;
Console.Write("\n{0,-20} {1,-20} {2,-10} {3,-10}", salesman.name, salesman.personNumber, salesman.district, salesman.soldArticles);
}
}
// bottomline for level 1.
Console.WriteLine("\n" + count + " Salesmen reached level 1: Under 50 articles");
// Counts how many salesmen that belong to level 2
count = 0;
foreach (Person salesman in sellers)
{
if (salesman.soldArticles >= LEVEL_ONE && salesman.soldArticles <= LEVEL_TWO)
{
count++;
Console.Write("\n{0,-20} {1,-20} {2,-10} {3,-10}", salesman.name, salesman.personNumber, salesman.district, salesman.soldArticles);
}
}
// bottomline for level 2.
Console.WriteLine("\n" + count + " Salesmen reached level 2: 50-99 articles");
// Counts how many salesmen that belongs to level 3
count = 0;
foreach (Person salesman in sellers)
{
if (salesman.soldArticles > LEVEL_TWO && salesman.soldArticles <= LEVEL_THREE)
{
count++;
Console.Write("\n{0,-20} {1,-20} {2,-10} {3,-10}", salesman.name, salesman.personNumber, salesman.district, salesman.soldArticles);
}
}
// bottomline for level 3.
Console.WriteLine("\n" + count + " Salesmen reached level 3: 100-199 articles");
// Counts how many salesmen that belongs to level 4
count = 0;
foreach (Person salesman in sellers)
{
if (salesman.soldArticles >= LEVEL_FOUR)
{
count++;
Console.Write("\n{0,-20} {1,-20} {2,-10} {3,-10}", salesman.name, salesman.personNumber, salesman.district, salesman.soldArticles);
}
}
// bottomline for level 4.
Console.WriteLine("\n" + count + " Salesmen reached level 4: Over 199 articles");
return sellers;
}
}
}

Use Console.SetOut(...)
https://learn.microsoft.com/en-us/dotnet/api/system.console.setout?view=net-6.0.
In general I would suggest to replace Console with an logging framework. e.g. Log4Net:
https://stackify.com/log4net-guide-dotnet-logging/

Pass 2D Array Info to a method in c#

I have an assesment where we have to implement methods in an app to store employees info in a 2D array and display it onscreen. So far the code works ok like this but I can't figure out a way to pass the 2D array information to the case 2 of the switch. It always results in an IndexOutOfRangeException when I try to return the array info from the UserInput method or when creating a method for case 2 and trying to pass the array. This is the code i have, thanks in advance for the help:
using System;
namespace EmployeeFileWithMethods
{
class Program
{
static void Main(string[] args)
{
int numberEmployees = 0;
string[,] table = new string[numberEmployees, 4];
string userInput = "1";
while ( userInput != "0" )
{
userInput = Intro();
switch ( userInput )
{
case "1":
UserInput();
break;
case "2":
Console.Clear();
for ( int user = 0; user < table.GetLength(0); user++ )
{
Console.WriteLine(" User " + ( user + 1 ));
for ( int row = 0; row < table.GetLength(1); row++ )
{
Console.Write(table[user, row] + "\n");
}
Console.WriteLine("");
}
break;
case "0":
break;
default:
{
DefaultCase();
break;
}
}
}
Console.WriteLine("Thanks for using the app!");
Console.ReadLine();
}
public static string Intro()
{
Console.WriteLine("[-------------------------------------------------------------------------------]");
Console.WriteLine(" Welcome to the Edinburgh College App \n What would you like to do?\n 1:Add User\n 2:Show User Info\n 0:Exit");
Console.WriteLine("[-------------------------------------------------------------------------------]");
string userInput = Console.ReadLine();
return userInput;
}
public static void DefaultCase()
{
Console.Clear();
Console.WriteLine("[-------------------------------------------------------------------------------]");
Console.WriteLine(" The option that you entered is invalid. Please try again. ");
Console.WriteLine("[-------------------------------------------------------------------------------]");
}
public static void UserInput()
{
Console.WriteLine("How many employees does your company have?");
int numberEmployees = Convert.ToInt32(Console.ReadLine());
string[,] table = new string[numberEmployees, 4];
for ( int row = 0; row < numberEmployees; row++ )
{
Console.WriteLine("Write the Forename of user " + ( row + 1 ));
string forename = Console.ReadLine();
table[row, 0] = forename;
Console.WriteLine("Write the Surname of user " + ( row + 1 ));
string surname = Console.ReadLine();
table[row, 1] = surname;
while ( true )
{
Console.WriteLine("Write the Phone of user " + ( row + 1 ));
string phone = Console.ReadLine();
if ( phone.Length == 11 )
{
table[row, 2] = phone;
break;
}
else
{
Console.WriteLine("Invalid Phone Number. Please Try Again");
continue;
}
}
while ( true )
{
Console.WriteLine("Write the Email of user " + ( row + 1 ));
string email = Console.ReadLine();
int charPos = email.IndexOf('#');
if ( charPos > 0 )
{
table[row, 3] = email;
break;
}
else
{
Console.WriteLine("Invalid Email. Please Try Again");
continue;
}
}
}
}
}
}

I can't reproduce the exception, but UserInput returns nothing and the table initialized in this method is lost at the return. So the table in Main has a size for the first dim of 0. You should pass the table as a parameter by ref and remove the table declaration in the method:
UserInput(table);
public static void UserInput(ref string[,] table)
But you need to resize this array to add new inputs.
A better and more simple and robust and cleaner way is to use a list of a class entity. Here is the code adapted and improved to use a list of an employee entity. I touched the code a minimum but it can be improved and refactored more, especially the while loops, and also you can use int.TryParse for the number of employees to add.
using System.Collections.Generic;
public class Employee
{
public string Forename { get; set; }
public string Surname { get; set; }
public string Phone { get; set; }
public string Email { get; set; }
}
static private void Main()
{
var employees = new List<Employee>();
string userInput = "1";
while ( userInput != "0" )
{
userInput = Intro();
switch ( userInput )
{
case "1":
UserInput(employees);
break;
case "2":
Console.Clear();
for ( int index = 0; index < employees.Count; index++ )
{
Console.WriteLine(" User " + ( index + 1 ));
Console.WriteLine(" Forename: " + employees[index].Forename);
Console.WriteLine(" Surname: " + employees[index].Surname);
Console.WriteLine(" Phone: " + employees[index].Phone);
Console.WriteLine(" eMail: " + employees[index].Email);
Console.WriteLine("");
}
break;
case "0":
break;
default:
{
DefaultCase();
break;
}
}
}
Console.WriteLine("Thanks for using the app!");
Console.ReadLine();
}
public static void UserInput(List<Employee> employees)
{
Console.WriteLine("How many employees does your company have?");
int countEmployees = employees.Count;
int countEmployeesNew = Convert.ToInt32(Console.ReadLine());
for ( int indexEmployeeNew = 0; indexEmployeeNew < countEmployeesNew; indexEmployeeNew++ )
{
int posEmployeeNew = countEmployees + indexEmployeeNew + 1;
Console.WriteLine("Write the Forename of user " + posEmployeeNew);
string forename = Console.ReadLine();
Console.WriteLine("Write the Surname of user " + posEmployeeNew);
string surname = Console.ReadLine();
string phone = "";
while ( true )
{
Console.WriteLine("Write the Phone of user " + posEmployeeNew);
phone = Console.ReadLine();
if ( phone.Length == 11 ) break;
Console.WriteLine("Invalid Phone Number. Please Try Again");
}
string email = "";
while ( true )
{
Console.WriteLine("Write the Email of user " + posEmployeeNew);
email = Console.ReadLine();
int charPos = email.IndexOf('#');
if ( charPos > 0 ) break;
Console.WriteLine("Invalid Email. Please Try Again");
}
employees.Add(new Employee
{
Forename = forename,
Surname = surname,
Phone = phone,
Email = email
});
}
}

C# Print an array of strings in the reverse order

so I have a problem where when I open my program and select 4 which is supposed to make it display all of the strings in the array but in reverse.
using System.Linq;
using System.Diagnostics;
using System.Runtime.CompilerServices;
namespace Homework3
{
class Program
{
static void Main(string[] args)
{
int optionIntOne;
int optionIntTwo;
int i;
int num = 0;
decimal k;
string[] names = {"Keyhan", "Adolf", "Niklas", "Jenny",
"Elisa", "Rudolf", "Bengt", "Hassan", "Kajsa", "Maggan"};
Console.WriteLine("Please Select an Option Below:\n1 - Find a student by Index \n" +
"2 - Find student Index by name\n3 - Display all student names with their Index \n" +
"4 - Display all the students in reverse order");
string optionStringone = Console.ReadLine();
bool isNumericOne = Int32.TryParse(optionStringone, out optionIntOne);
Console.Clear();
switch (optionIntOne)
{
case 1:
Console.WriteLine("***FIND Student by ID" + "\n" + "Please select a number between 0 - 9:");
string studentNumber = (Console.ReadLine());
bool isNumericTwo = Int32.TryParse(studentNumber, out optionIntTwo);
if (isNumericTwo == true && optionIntTwo < names.Length)
Console.WriteLine(names[optionIntTwo]);
else
Console.WriteLine("Please enter a valid number");
break;
case 2:
Console.WriteLine("*** FIND Student Index by Name \n Please Print one of the above names");
foreach (string name in names)
Console.WriteLine((name));
Console.WriteLine("\n");
string studentName = (Console.ReadLine().ToUpper());
//ToUpper så slipper loopen göra det på repeat
Console.Clear();
bool b = false;
if (decimal.TryParse(studentName, out k) || studentName == string.Empty)
{
Console.WriteLine("Please Enter a Valid Name");
}
else
{
for (i = 0; i < names.Length; i++)
{
if (names[i].ToUpper() == studentName)
{
b = true;
Console.WriteLine(names[i] + " Has the index of " + i);
break;
}
}
if (b == false)
Console.WriteLine("The Student does not Exist in the List");
}
break;
case 3:
while (num < names.Length)
{
Console.WriteLine(num + " - " + names[num]);
num++;
}
break;
case 4:
while (num < names.Length)
{
Console.WriteLine(names[num].Reverse());
num++;
}
break;
default:
Console.WriteLine("Enter a Valid Number");
break;
}
Console.ReadKey();
}
}
}
(option 3 but to print them in reverse order)
Visual Studio isnt giving me any errors but it outputs like this 1 instead of the reverse order of this 2
Anyone know how to fix?/could point out the problem

First of all this line:
Console.WriteLine(names[num].Reverse());
Is reversing the strings inside the list (so names[0].Reverse() would be "nahyeK") because string is also a list (a list of chars). If you want to reverse the whole list you only write names.Reverse();
read more at: Microsoft docs - Reverse()
So the next step would be to print it out.
When you do list.Reverse(); it will return IEnumerable<TSource> which you can use in a loop to get the names.
string[] names = {"Keyhan", "Adolf", "Niklas", "Jenny",
"Elisa", "Rudolf", "Bengt", "Hassan", "Kajsa", "Maggan"};
IEnumerable<string> reversedList = names.Reverse();
foreach(string name in reversedList)
{
Console.WriteLine(name);
}
I usually use list.Reverse().ToList() so i get a "normal" list again because it's in my opinion easier to use/understand.
There is some options, the namespace system.linq.enumerable got some stuff for that:
.ToArray() - converts it to an Array.
.ToList() - converts it to a List
So the complete solution would be to keep the .Reverse outside the loop like this:
foreach(name in names.Reverse().ToList())
{
Console.WriteLine(name);
}

Here is one option:
static void Main(string[] args)
{
int num = 0;
string[] names = { "Alice", "Bob", "Charles", "Delilah" };
while (num < names.Length)
{
Console.WriteLine(names.Reverse().ElementAt(num));
num++;
}
// Prints
//
// Delilah
// Charles
// Bob
// Alice
Console.ReadKey();
}
As per the comments it is not optimal to call Reverse() in each loop. Instead, perform the Reverse() outside of the loop.
A better alternative might be:
static void Main(string[] args)
{
string[] names = { "Alice", "Bob", "Charles", "Delilah" };
for (int num = names.Length - 1; num >= 0; num--)
{
Console.WriteLine(names[num]);
}
Console.ReadKey();
}

how can i number each user input? C#

Just started learning C#, my question is how do i keep record of the user input in order like this: score 1:
score 1: 98
score 2: 76
score 3: 65
score 4: 78
score 5: 56
In my code i can input the number but cant seem to setup the order how can i achieve this goal
my input:
98
76
65
78
56
code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace MyGrade03
{
public class Program
{
private int total; // sum of grades
private int gradeCounter; //number of grades entered
private int aCount; // Count of A grades
private int bCount; // Count of B grades
private int cCount; // Count of C grades
private int dCount; // Count of D grades
private int fCount; // Count of F grades
private string v;
public string CourseName { get; set; }
public Program(string name)
{
CourseName = name;
}
public void DisplayMessage()
{
Console.WriteLine("Welcome to the grade book for \n{0}!\n",
CourseName);
}
public void InputGrade()
{
int grade;
string input;
Console.WriteLine("{0}\n{1}",
"Enter the integer grades in the range 0-100",
"Type <Ctrl> z and press Enter to terminate input:");
input = Console.ReadLine(); //read user input
while (input != null)
{
grade = Convert.ToInt32(input); //read grade off user input
total += grade;// add grade to total
gradeCounter++; // increment number of grades
IncrementLetterGradeCounter(grade);
input = Console.ReadLine();
}
}
private void IncrementLetterGradeCounter(int grade)
{
switch (grade / 10)
{
case 9: //grade was in the 90s
case 10:
++aCount;
break;
case 8:
++bCount;
break;
case7:
++cCount;
case6:
++dCount;
break;
default:
++fCount;
break;
}
}
public void DisplayGradeReport()
{
Console.WriteLine("\nGrade Report");
if (gradeCounter != 0)
{
double average = (double)total / gradeCounter;
Console.WriteLine("Total of the {0} grades entered is {1}",
gradeCounter, total);
Console.WriteLine("class average is {0:F}", average);
Console.WriteLine("{0}A: {1}\nB: {2}\nC: {3}\nD: {4}\nF: {5} ",
"Number of students who received each grade: \n",
aCount,
bCount,
cCount,
dCount,
fCount);
}
else
Console.WriteLine("No grades were entered");
}
static void Main(string[] args)
{
Program mygradebook = new Program(
"CS101 introduction to C3 programming");
mygradebook.DisplayMessage();
mygradebook.InputGrade();
mygradebook.DisplayGradeReport();
}
}
}

There are a lot of data structures that will allow you to store data in order. I'd personally recommend a List<int> for this.
You can add things to it as simply as:
var list = new List<int>();
list.Add(37);
list.Add(95);
And you can either read it with an iterator (foreach(var score in list){...}) or get individual numbers out (var firstScore = list[0]). The documentation will tell you more about what you can do with a List<T>.

declare one variable to count inputs like private static int counter = 0;
in InputGrade method, put like below
Console.WriteLine("{0}\n{1}",
"Enter the integer grades in the range 0-100",
"Type <Ctrl> z and press Enter to terminate input:");
counter++;
System.Console.Write("score " + counter + ":");
input = Console.ReadLine(); //read user input
and inside while (input != null) put like below
IncrementLetterGradeCounter(grade);
counter++;
System.Console.Write("score " + counter + ":");
input = Console.ReadLine();
so, output will be like
Here is the full code
public class Program
{
private int total; // sum of grades
private int gradeCounter; //number of grades entered
private int aCount; // Count of A grades
private int bCount; // Count of B grades
private int cCount; // Count of C grades
private int dCount; // Count of D grades
private int fCount; // Count of F grades
private string v;
private static int counter = 0;
public string CourseName { get; set; }
public Program(string name)
{
CourseName = name;
}
public void DisplayMessage()
{
Console.WriteLine("Welcome to the grade book for \n{0}!\n",
CourseName);
}
public void InputGrade()
{
int grade;
string input;
Console.WriteLine("{0}\n{1}",
"Enter the integer grades in the range 0-100",
"Type <Ctrl> z and press Enter to terminate input:");
counter++;
System.Console.Write("score " + counter + ":");
input = Console.ReadLine(); //read user input
while (input != null)
{
grade = Convert.ToInt32(input); //read grade off user input
total += grade;// add grade to total
gradeCounter++; // increment number of grades
IncrementLetterGradeCounter(grade);
counter++;
System.Console.Write("score " + counter + ":");
input = Console.ReadLine();
}
}
private void IncrementLetterGradeCounter(int grade)
{
switch (grade / 10)
{
case 9: //grade was in the 90s
case 10:
++aCount;
break;
case 8:
++bCount;
break;
case7:
++cCount;
case6:
++dCount;
break;
default:
++fCount;
break;
}
}
public void DisplayGradeReport()
{
Console.WriteLine("\nGrade Report");
if (gradeCounter != 0)
{
double average = (double)total / gradeCounter;
Console.WriteLine("Total of the {0} grades entered is {1}",
gradeCounter, total);
Console.WriteLine("class average is {0:F}", average);
Console.WriteLine("{0}A: {1}\nB: {2}\nC: {3}\nD: {4}\nF: {5} ",
"Number of students who received each grade: \n",
aCount,
bCount,
cCount,
dCount,
fCount);
}
else
Console.WriteLine("No grades were entered");
}
static void Main(string[] args)
{
Program mygradebook = new Program(
"CS101 introduction to C3 programming");
mygradebook.DisplayMessage();
mygradebook.InputGrade();
mygradebook.DisplayGradeReport();
Console.ReadKey();
}
}

You can look for Collections available in C# (MSDN Collections).
In your case, you don't really care about order, you can use List<int>. Otherwise if you want to keep an order you can use Stack<int> or Queue<int>. And if you want to keep a collection of Student Name + Score you can use a Dictionary<string,int>

checking integers in String

I'm checking a string whether it has integers or anything else in function Parse().
Here is my Code
static public int input()
{
Console.WriteLine("Enter The Number Of Student You Want to get Record");
int x;
string inputString = Console.ReadLine();
if (int.TryParse(inputString, out x))
{
Console.WriteLine(inputString + " Is Integer");
return x= Convert.ToInt32(inputString);
}
else
{
input();
}
return x;
}
And full code is:
static void Main(string[] args)
{
int num = 0;
string[] names = new string[] { };
long[] fee = new long[] { };
string[] className = new string[] { };
do
{
Console.WriteLine("Enter Option You Want: \nA:Enter Student Record\nB:Display Student Record\nQ:Exit");
string option =null;
option =Console.ReadLine();
switch (option)
{
case "A":
case "a":
{
num = input();
names = new string[num];
fee = new long[num];
className = new string[num];
for (int i = 0; i < num; i++)
{
Console.WriteLine("Enter Name Of Student:{0}",i);
Console.Write("Enter Student Name: "); names[i] = Console.ReadLine();
Console.Write("Enter Student Fee: "); fee[i] = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter Student Class Name: "); className[i] = Console.ReadLine();
}
break;
}
case "B":
case "b":
{
for (int i = 0; i < names.Length; i++)
{
Console.WriteLine("Record of Student: {0}",i);
Console.WriteLine("Name: "+names[i]+ "\nFee: " + fee[i]+ "\nClass Name: " + className[i]);
//Console.WriteLine("Name: {0}\n Class Name: {1}\n Fee: {3}\n",names[i],className[i],fee[i]);
}
break;
}
case "Q":
case "q":
{
Environment.Exit(1);
break;
}
default:
{
Console.WriteLine("Invalid Option");
break;
}
}
} while (true);
}
But The problem is when I enters char instead of int and it works fine and calls itself again but if 2nd time or after 2nd time I input int then does not take input of students and instead it repeats the LOOP again.
So what's the problem, is problem in Input Function????

You could use a regular expression to find the INTs. Also you should call
return input();
instead of
input();
new method:
static public int input(){
Console.WriteLine("Enter The Number Of Student You Want to get Record");
string input = Console.ReadLine();
if (Regex.IsMatch(input, #"\d+"))
{
return int.Parse(Regex.Match(input, #"\d+").Value);
}
else
{
return input();
}
}

I'm assuming you're a student. I started out with C# doing the same stuff. Which I wouldn't do anymore but since you are doing it. I'd recommend using goto, making this method recursive is a no no.
static public int input()
{
Prompt:
Console.WriteLine("Enter The Number Of Student You Want to get Record");
int x;
string inputString = Console.ReadLine();
if (int.TryParse(inputString, out x))
{
Console.WriteLine(inputString + " Is Integer");
return x;
}
else
{
goto Prompt;
}
}