C#•3y ago

I am unaware on how to fix this conversion error

it's saying i can't convert from string to int, though I am unsure why when i used the string.format method to represent my int variable ID as a string and display it in my output file. I have three separte files for a regular user logging in, an administrator, and thena file to put the whole program together.
here is admin and the full program since that is where the issue lies

using System;
using System.Globalization;
using System.IO;


namespace LogIn
{
    public class Administrator : RegularUser
    {
        //data fields
        private int ID;


        public Administrator(int ID = 0, string userName = " ") : base(userName)
        {
            //data fields
            this.ID = ID;
        }

        //GETTER
        /**
         Returns the ID of the admin
        @return: admin's ID
         */
        public int GetID() { return ID; }


        //SETTERS
        /**
         Returns an updated ID number
        @return: admin's updated ID number
         */
        public void SetID(int ID) { this.ID = ID; }

        //sign-in method
        public new static void SignIn(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed in @ {1}", dateAndTime);
        }

        //sign out method
        public new static void SignOut(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed out @ {1}", dateAndTime);
        }


        /** Returns the user's username and ID in string format and whether they've signed in/out
          @return: a string representing who signed in/out along with ther ID #
      */
        public override string Stringify()
        {
            return string.Format("({1}) ", base.Stringify(), GetID());
        }

        public override string Stringify2()
        {
            return string.Format("({1}) ", base.Stringify2(), GetID());
        }


    }


}

using System;
using System.Globalization;
using System.IO;


namespace LogIn
{
    public class Administrator : RegularUser
    {
        //data fields
        private int ID;


        public Administrator(int ID = 0, string userName = " ") : base(userName)
        {
            //data fields
            this.ID = ID;
        }

        //GETTER
        /**
         Returns the ID of the admin
        @return: admin's ID
         */
        public int GetID() { return ID; }


        //SETTERS
        /**
         Returns an updated ID number
        @return: admin's updated ID number
         */
        public void SetID(int ID) { this.ID = ID; }

        //sign-in method
        public new static void SignIn(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed in @ {1}", dateAndTime);
        }

        //sign out method
        public new static void SignOut(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed out @ {1}", dateAndTime);
        }


        /** Returns the user's username and ID in string format and whether they've signed in/out
          @return: a string representing who signed in/out along with ther ID #
      */
        public override string Stringify()
        {
            return string.Format("({1}) ", base.Stringify(), GetID());
        }

        public override string Stringify2()
        {
            return string.Format("({1}) ", base.Stringify2(), GetID());
        }


    }


}

using System;
using System.Globalization;
using System.IO;


namespace LogIn
{
    public class Administrator : RegularUser
    {
        //data fields
        private int ID;


        public Administrator(int ID = 0, string userName = " ") : base(userName)
        {
            //data fields
            this.ID = ID;
        }

        //GETTER
        /**
         Returns the ID of the admin
        @return: admin's ID
         */
        public int GetID() { return ID; }


        //SETTERS
        /**
         Returns an updated ID number
        @return: admin's updated ID number
         */
        public void SetID(int ID) { this.ID = ID; }

        //sign-in method
        public new static void SignIn(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed in @ {1}", dateAndTime);
        }

        //sign out method
        public new static void SignOut(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed out @ {1}", dateAndTime);
        }


        /** Returns the user's username and ID in string format and whether they've signed in/out
          @return: a string representing who signed in/out along with ther ID #
      */
        public override string Stringify()
        {
            return string.Format("({1}) ", base.Stringify(), GetID());
        }

        public override string Stringify2()
        {
            return string.Format("({1}) ", base.Stringify2(), GetID());
        }


    }


}

using System;
using System.Globalization;
using System.IO;


namespace LogIn
{
    public class Administrator : RegularUser
    {
        //data fields
        private int ID;


        public Administrator(int ID = 0, string userName = " ") : base(userName)
        {
            //data fields
            this.ID = ID;
        }

        //GETTER
        /**
         Returns the ID of the admin
        @return: admin's ID
         */
        public int GetID() { return ID; }


        //SETTERS
        /**
         Returns an updated ID number
        @return: admin's updated ID number
         */
        public void SetID(int ID) { this.ID = ID; }

        //sign-in method
        public new static void SignIn(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed in @ {1}", dateAndTime);
        }

        //sign out method
        public new static void SignOut(string dateAndTime, StreamWriter writer)
        {
            writer.WriteLine("signed out @ {1}", dateAndTime);
        }


        /** Returns the user's username and ID in string format and whether they've signed in/out
          @return: a string representing who signed in/out along with ther ID #
      */
        public override string Stringify()
        {
            return string.Format("({1}) ", base.Stringify(), GetID());
        }

        public override string Stringify2()
        {
            return string.Format("({1}) ", base.Stringify2(), GetID());
        }


    }


}

DinnyOP•10/29/23, 1:20 AM

now part of the file to put it all together

DinnyOP•10/29/23, 1:22 AM

 while (!reader.EndOfStream)
 {

     string? nextLine = reader.ReadLine();
     if (nextLine != null)
     {
         string[] nextItem = nextLine.Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
         if (nextItem.Length == 0) { continue; }


         if (nextItem[0].Equals("IN")) 
         {
             if (nextItem[1].Equals("REG"))
             {
                 writer.Write("Regular User ");
                 reg = new(nextItem[2]);
                 
                 //get date and time
                 /*write info to output file in format
                  adm/reg [username] date and time*/

             }

             if (nextLine[1].Equals("ADM"))
             {
                 writer.Write("Administrator ");
                 admin = new(nextItem[2]);
                 //get the username
                 //get ID #
                 //get date and time
                 /*write info to output file in format
                  adm/reg [username] (ID) date and time*/

             }

 while (!reader.EndOfStream)
 {

     string? nextLine = reader.ReadLine();
     if (nextLine != null)
     {
         string[] nextItem = nextLine.Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
         if (nextItem.Length == 0) { continue; }


         if (nextItem[0].Equals("IN")) 
         {
             if (nextItem[1].Equals("REG"))
             {
                 writer.Write("Regular User ");
                 reg = new(nextItem[2]);
                 
                 //get date and time
                 /*write info to output file in format
                  adm/reg [username] date and time*/

             }

             if (nextLine[1].Equals("ADM"))
             {
                 writer.Write("Administrator ");
                 admin = new(nextItem[2]);
                 //get the username
                 //get ID #
                 //get date and time
                 /*write info to output file in format
                  adm/reg [username] (ID) date and time*/

             }

i get the error where it says "admin = new(nextItem[2]);"

Angius•10/29/23, 2:08 AM

Because... it's a string

Angius•10/29/23, 2:08 AM

nextItemnextItem is an array of strings

Angius•10/29/23, 2:08 AM

string[]string[], it says so right there

Angius•10/29/23, 2:09 AM

So, every element of that array will be a string

Angius•10/29/23, 2:09 AM

If you want to parse a string to an int, use int.TryParse()int.TryParse()

Angius•10/29/23, 2:10 AM

Also, why not just use Json instead of fiddling around with stringifying the data manually?

DinnyOP•10/29/23, 3:55 AM

bc that’s the way my prof wants it done

DinnyOP•10/29/23, 3:55 AM

we are learning overriding

DinnyOP•10/29/23, 3:55 AM

and i want it to stay a string that’s why i was confused

DDinny it's saying i can't convert from string to int, though I am unsure why when i us...

TeBeCo•10/29/23, 11:03 AM

        //data fields
        private int ID;

        //GETTER
        /**
         Returns the ID of the admin
        @return: admin's ID
         */
        public int GetID() { return ID; }


        //SETTERS
        /**
         Returns an updated ID number
        @return: admin's updated ID number
         */
        public void SetID(int ID) { this.ID = ID; }

        //data fields
        private int ID;

        //GETTER
        /**
         Returns the ID of the admin
        @return: admin's ID
         */
        public int GetID() { return ID; }


        //SETTERS
        /**
         Returns an updated ID number
        @return: admin's updated ID number
         */
        public void SetID(int ID) { this.ID = ID; }

TeBeCo•10/29/23, 11:03 AM

consider removing all that code

TeBeCo•10/29/23, 11:03 AM

in C# you never do Getter and Setter ever

TeBeCo•10/29/23, 11:03 AM

you use property

TeBeCo•10/29/23, 11:04 AM

public int Id {get;set;}

public int Id {get;set;}

TeBeCo•10/29/23, 11:04 AM

this replace all that code about

TeBeCo•10/29/23, 11:04 AM

there's no @return@return either

TeBeCo•10/29/23, 11:04 AM

because it's C# not Javascript

TeBeCo•10/29/23, 11:04 AM

if you try to document your C# code you need to use C# ducoumentation

TeBeCo•10/29/23, 11:05 AM

the stuff that look like ///<summary>///<summary>

TeBeCo•10/29/23, 11:05 AM

now index starts at

in C#

TeBeCo•10/29/23, 11:06 AM

so if you format a string placeholder starts at

not at

TeBeCo•10/29/23, 11:06 AM

and if you pass 2 value

TeBeCo•10/29/23, 11:06 AM

you need 2 place holder

Angius•10/29/23, 2:21 PM

Or better yet, use string interpolation instead

TTeBeCo in C# you never do Getter and Setter ever

DinnyOP•10/29/23, 4:37 PM

this is the way my prof is teaching it and the way he expects us to do it as well

AAngius Or better yet, use string interpolation instead

DinnyOP•10/29/23, 4:37 PM

he hasn’t taught us that yet so idk what that is

DinnyOP•10/29/23, 4:37 PM

he requires doc strings and said we will use a large chunk of points if we don’t use them too

DinnyOP•10/29/23, 4:37 PM

i get this seems impractical but i just think my profs teaching style is outdated

Angius•10/29/23, 4:38 PM

var num = 69;
Console.WriteLine($"The number is {num}");

var num = 69;
Console.WriteLine($"The number is {num}");

that's interpolation

DinnyOP•10/29/23, 4:38 PM

would we be able to work around that ?

AAngius ```cs var num = 69; Console.WriteLine($"The number is {num}"); ``` that's interp...

DinnyOP•10/29/23, 4:38 PM

alright thank u

Angius•10/29/23, 4:38 PM

And yes, it does seem like yout teacher is another one of the fossils that stopped developing their skills in 1999

AAngius And yes, it does seem like yout teacher is another one of the fossils that stopp...

DinnyOP•10/29/23, 4:38 PM

HAHAHAHAHAHAHAHAA

DinnyOP•10/29/23, 4:38 PM

i’ve gotten help before here and ppl were so confused why i did code the way i did. i must always explain my prof’s teaching style

DinnyOP•10/29/23, 4:41 PM

Aside from that tho, my goal is to turn the ID number into a strong but it keeps trying to turn it into an int but idk how to make that go away

Angius•10/29/23, 4:41 PM

Administrator ctor takes an int

Angius•10/29/23, 4:42 PM

You must give it an int

DDinny this is the way my prof is teaching it and the way he expects us to do it as wel...

TeBeCo•10/29/23, 4:44 PM

what a horrible teacher

DinnyOP•10/29/23, 4:44 PM

i did give an int, but at the end, i wanted to display it all as a string like my prof did

DinnyOP•10/29/23, 4:44 PM

lemme show u what he did

DinnyOP•10/29/23, 4:44 PM

plz hold

DinnyOP•10/29/23, 4:48 PM

 public virtual string Stringify() { return string.Format("Name: {0}\nQuantity: {1:D}", GetName(), GetQuantity()); }

 public virtual string Stringify() { return string.Format("Name: {0}\nQuantity: {1:D}", GetName(), GetQuantity()); }

DinnyOP•10/29/23, 4:48 PM

here's his entire code for the first part

DinnyOP•10/29/23, 4:48 PM

of his example code

DinnyOP•10/29/23, 4:49 PM

namespace Module_8 {
    public class GenericItem {
        // Data fields
        private string? name;  // Stores the name of the item.
        private uint quantity;  // Stores the quantity of the item.

        // Constructor
        public GenericItem(string name = "", uint quantity = 0) {
            SetName(name);
            SetQuantity(quantity);
        }

        // Getters

        /** Returns the name of the item.
            @return: name of the item
        */
        public string? GetName() { return name; }

        /** Returns the quantity of the item.
            @return: quantity of the item
        */
        public uint GetQuantity() { return quantity; }

        // Setters

        /** Updates the name of the item.
            @param name: updated name of the item
        */
        public void SetName(string name) { this.name = name; }

        /** Updates the quantity of the item.
            @param quantity: updated quantity of the item
        */
        public void SetQuantity(uint quantity) { this.quantity = quantity; }

        // Method

        /** Converts the item to a string.
            @return: a string representing the item
        */
        public virtual string Stringify() { return string.Format("Name: {0}\nQuantity: {1:D}", GetName(), GetQuantity()); }
    }
}

namespace Module_8 {
    public class GenericItem {
        // Data fields
        private string? name;  // Stores the name of the item.
        private uint quantity;  // Stores the quantity of the item.

        // Constructor
        public GenericItem(string name = "", uint quantity = 0) {
            SetName(name);
            SetQuantity(quantity);
        }

        // Getters

        /** Returns the name of the item.
            @return: name of the item
        */
        public string? GetName() { return name; }

        /** Returns the quantity of the item.
            @return: quantity of the item
        */
        public uint GetQuantity() { return quantity; }

        // Setters

        /** Updates the name of the item.
            @param name: updated name of the item
        */
        public void SetName(string name) { this.name = name; }

        /** Updates the quantity of the item.
            @param quantity: updated quantity of the item
        */
        public void SetQuantity(uint quantity) { this.quantity = quantity; }

        // Method

        /** Converts the item to a string.
            @return: a string representing the item
        */
        public virtual string Stringify() { return string.Format("Name: {0}\nQuantity: {1:D}", GetName(), GetQuantity()); }
    }
}

Angius•10/29/23, 4:49 PM

Jesus

DinnyOP•10/29/23, 4:49 PM

yeah i was NOT joking lmao

I am unaware on how to fix this conversion error

Similar Threads

Similar Threads

Similar Threads