C#•2mo ago

✅ Can someone help me understand GetType()

Do I have to instantiate an object in order to use GetType()

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letterObject = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();

    }

    public class Letter()
    {
        private string Name;
        private string Date;

        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        private string TrackingNumber;
        public string TrackingNumber { get; set; }
    }
  
    
     public override string ToString()
     {
            string className = WriteLine(Letter.GetType());
            return className;
     }

}

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letterObject = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();

    }

    public class Letter()
    {
        private string Name;
        private string Date;

        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        private string TrackingNumber;
        public string TrackingNumber { get; set; }
    }
  
    
     public override string ToString()
     {
            string className = WriteLine(Letter.GetType());
            return className;
     }

}

29 Replies

jcotton42•2mo ago

GetType is an instance method. You can do this.GetType() or just GetType().

Gismo•2mo ago

Yeah, you do need to make an object first if you wanna use GetType(). Its an instance method, so you cant call it directly on the class itself, Inside a class though, you can Just write GetType() and itll automatically refer to that object

strikeouts27OP•2mo ago

I will attempt both solutions at once! @jcotton42 @Gismo Did I do that incorrectly? Error output

/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.cs(41,32): error CS0029: Cannot implicitly convert type 'System.Type' to 'string' [/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.csproj]

/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.cs(41,32): error CS0029: Cannot implicitly convert type 'System.Type' to 'string' [/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.csproj]

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letterObject = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();

    }

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType();
            return Console.WriteLine(className);
        }

    }

}

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letterObject = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();

    }

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType();
            return Console.WriteLine(className);
        }

    }

}

Okay so it is saying I cannot convert an object into a string I must access its properties. such as .Name GetType is an instance method, so, would I have to call the class and make an object? If so I could use it, but the requirements want me to have it returned in the class. So I have a catch 22. I cannot use the method without instantating an object and I cannot return an instianted object within a class. This problem is confusing. I am going to attempt to use the this. I see your post @Timmy I am on it

Timmy•2mo ago

You cannot implicitly convert a type to a string, this is because a string in C# is a type, thus, you must convert it through the "ToString" virtual method. The error stems from string className = GetType();, you can simply convert System.Type (which GetType() returns) to a string through it's ToString() virtual method like so:

string className = GetType().ToString();
// or
System.Type instance_type = GetType(); // GetType() works on any instance, not just classes, so structs, interfaces, etc are avaliable.
string instance_name = type.ToString(); // ToString() likely uses reflection here to get the underlying instance name, but it simply returns the name of the instance in this case.

string className = GetType().ToString();
// or
System.Type instance_type = GetType(); // GetType() works on any instance, not just classes, so structs, interfaces, etc are avaliable.
string instance_name = type.ToString(); // ToString() likely uses reflection here to get the underlying instance name, but it simply returns the name of the instance in this case.

strikeouts27OP•2mo ago

/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.cs(42,20): error CS0029: Cannot implicitly convert type 'void' to 'string' [/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.csproj]

/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.cs(42,20): error CS0029: Cannot implicitly convert type 'void' to 'string' [/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.csproj]

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letterObject = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();

    }

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return Console.WriteLine(className);
        }

    }

}

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letterObject = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();

    }

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return Console.WriteLine(className);
        }

    }

}

that makes sense, I must specify to C# that I want a string and GetType() does not return a string type. It returns System.Type which is some type I have never heard of but its not a string so I need a convertor hence ToString()

Timmy•2mo ago

Console.WriteLine(className) is printing the string className to console and then returning void (nothing). What you would want to do is simply return className or GetType().ToString(), and then use Console.WriteLine(certifiedLetter.ToString())

strikeouts27OP•2mo ago

So the way to diagnose this error is say okay what is being generated by my code currently, and how do i convert it to the correct type.

Timmy•2mo ago

In full:

Main()
{
  Letter letter = new CertifiedLetter();
  Console.WriteLine(letter.ToString());
}

...

ToString()
{
  return GetType().ToString();
}

Main()
{
  Letter letter = new CertifiedLetter();
  Console.WriteLine(letter.ToString());
}

...

ToString()
{
  return GetType().ToString();
}

Essentially. If the error shows more then that would be useful to show and I may be able to help further, but yes, it is saying that it cannot convert from type A to type B, and it gives the error code cs0029 which you can look up and find a few examples (usually).

strikeouts27OP•2mo ago

posting now

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString()); 

    }

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

}

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString()); 

    }

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

}

Timmy•2mo ago

Lastly, implicitly in coding typically refers to when you simply write it, and it automatically converts from type A to type B without having to cast to another object, or use a function to convert it. string className = GetType().ToString(); is unecessary here in ToString().

strikeouts27OP•2mo ago

output project "/workspaces/9780357429235_farrell-c-sharp-aaba885a-f662-4800-a980-c6b80f6b520c/chapter10/ex01/student/LetterDemo.csproj" LetterDemo+Letter

Timmy•2mo ago

Unless you want clarity, then in that case you can keep it and simply return className instead of return this.GetType().ToString(); The reason that you see the + inbetween is because it's how C# represents generic types (when you used : Letter). + is not allowed for naming variables or types, so you can split the string by + and return the first index in the array if you would prefer to exclude any inheriting types. Example:

ToString()
{
  string fullName = this.GetType().ToString();
  string typeName = fullName.Split('+')[0]
  return typeName;
}

ToString()
{
  string fullName = this.GetType().ToString();
  string typeName = fullName.Split('+')[0]
  return typeName;
}

strikeouts27OP•2mo ago

its complaining about nested functions. Do I have to define Main() last or do I need to utilize a namespace one sec

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString());

    }
}

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString());

    }
}

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

@Timmy I think I have a better understanding. Do you have any reccomendations for learning C# that i can review? like youtube channels, udemy or books? @Timmy @Gismo @jcotton42 Thank you everyone! 🙂

Timmy•2mo ago

Sorry for the delay lol, did you get the nested function issue sorted?

strikeouts27OP•2mo ago

well kind of

Gismo•2mo ago

Timmy•2mo ago

What's the error?

strikeouts27OP•2mo ago

Status: FAILED! Check: 1 Test: Letter ToString override Reason: Unable to run tests. Error : str - AssertionError Timestamp: 2025-10-16 23:44:46.670457 Status: FAILED! Check: 1 Test: Letter ToString override Reason: Unable to run tests. Error : str - AssertionError Timestamp: 2025-10-16 23:44:53.968062

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString());

    }
}

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString());

    }
}

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

it seems that they are indented but i changed the brackets so that only main was in letter demo

Timmy•2mo ago

Learn what you want to learn as in if you want to make games, make games, you'll learn best by doing, and don't be afraid of google, google is your friend. And if you want to get good at interviews and being good at coding for jobs, and less for a hobby, then maybe do leetcode problems. Personally I would recommend because it's best for motivation and learning things quickly, but doesn't always mean you learn everything you need to. Myself personally started with Unity and then began moving towards custom game engines because it's what seems fun to me, and it's where I want to pursue most.

strikeouts27OP•2mo ago

Nested classes are when the class is inside a class due to brackets. so do I just have the ltter demo class encompass main, letter, and certified letter

Timmy•2mo ago

//class LetterDemo
//{
//    static void Main()
//    {
//        // Write your code here
//
//        Letter letter = new Letter();
//        Letter CertifiedLetter = new CertifiedLetter();
//        Console.WriteLine(letter.ToString());
//
//    }
//}

//class LetterDemo
//{
//    static void Main()
//    {
//        // Write your code here
//
//        Letter letter = new Letter();
//        Letter CertifiedLetter = new CertifiedLetter();
//        Console.WriteLine(letter.ToString());
//
//    }
//}

If you notice, letter.ToString() here is not defined. This is because you defined ToString() in the CertifiedLetter class but not the Letter class.

strikeouts27OP•2mo ago

the base class i see. so move the method to the base class and that takes care of the base class than i can call the method in the child class

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString());
        Console.WriteLine(CertifiedLetter.ToString()); 

    }
}

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

    }

using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
using System;
using static System.Console;
using System.Globalization;
using System.Reflection.Metadata.Ecma335;

/*
Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods.

The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the Name of the recipient and the Date mailed (stored as strings).

Create a child class named CertifiedLetter that includes an auto-implemented property TrackingNumber (of type string) that holds a tracking number for the letter.

Next, include a ToString() method that overrides the Object class’s ToString() method and returns a string that contains the name of the class (using GetType()) and the respective class's data field values. Use default, empty constructor for both classes.
 
*/

class LetterDemo
{
    static void Main()
    {
        // Write your code here

        Letter letter = new Letter();
        Letter CertifiedLetter = new CertifiedLetter();
        Console.WriteLine(letter.ToString());
        Console.WriteLine(CertifiedLetter.ToString()); 

    }
}

    public class Letter()
    {
        public string Name { get; set; }
        public string Date { get; set; }

        public override string ToString()
        {
            string className = GetType().ToString();
            return this.GetType().ToString();
        }

    }

    public class CertifiedLetter : Letter
    {
        public string TrackingNumber { get; set; }

    }

Status: FAILED! Check: 1 Test: Letter ToString override Reason: StringAssert.Contains failed. String 'Letter' does not contain string 'Electric Company'. Can not find the approriate Name. Error : str - AssertionError Timestamp: 2025-10-16 23:53:22.027279] Status: FAILED! Check: 1 Test: Letter ToString override Reason: StringAssert.Contains failed. String 'CertifiedLetter' does not contain string 'Electric Company'. Can not find the approriate Name. Error : str - AssertionError Timestamp: 2025-10-16 23:53:30.837636\ it seems the test uses an electric company whatever. i have a gpt answer that fits the requirements but i think i have learned the main idea of the exercise. fighting with a picky linter for 4 hours is very undesirable

using System;
using static System.Console;

// Program entry point
class LetterDemo
{
    static void Main()
    {
        // instantiate using default constructors
        var letter = new Letter();                       // top-level class
        letter.Name = "John Doe";
        letter.Date = "2025-10-16";

        var cert = new CertifiedLetter();                // top-level class
        cert.Name = "Jane Smith";
        cert.Date = "2025-10-15";
        cert.TrackingNumber = "TRK-000123";

        // print ToString() results
        WriteLine(letter.ToString());
        WriteLine(cert.ToString());
    }
}

// Top-level Letter class (not nested)
public class Letter
{
    public string Name { get; set; }    // auto-property for Name
    public string Date { get; set; }    // auto-property for Date

    public Letter() { }                 // default constructor

    // override ToString to return class name + data fields
    public override string ToString()
    {
        // GetType().Name => runtime class name (e.g. "Letter" or "CertifiedLetter")
        return $"{GetType().Name}: Name={Name ?? \"(null)\"}, Date={Date ?? \"(null)\"}";
    }
}

// Top-level derived class (not nested)
public class CertifiedLetter : Letter
{
    public string TrackingNumber { get; set; }   // extra property

    public CertifiedLetter() : base() { }        // default constructor

    // override ToString to include tracking number
    public override string ToString()
    {
        return $"{GetType().Name}: Name={Name ?? \"(null)\"}, Date={Date ?? \"(null)\"}, TrackingNumber={TrackingNumber ?? \"(null)\"}";
    }
}

using System;
using static System.Console;

// Program entry point
class LetterDemo
{
    static void Main()
    {
        // instantiate using default constructors
        var letter = new Letter();                       // top-level class
        letter.Name = "John Doe";
        letter.Date = "2025-10-16";

        var cert = new CertifiedLetter();                // top-level class
        cert.Name = "Jane Smith";
        cert.Date = "2025-10-15";
        cert.TrackingNumber = "TRK-000123";

        // print ToString() results
        WriteLine(letter.ToString());
        WriteLine(cert.ToString());
    }
}

// Top-level Letter class (not nested)
public class Letter
{
    public string Name { get; set; }    // auto-property for Name
    public string Date { get; set; }    // auto-property for Date

    public Letter() { }                 // default constructor

    // override ToString to return class name + data fields
    public override string ToString()
    {
        // GetType().Name => runtime class name (e.g. "Letter" or "CertifiedLetter")
        return $"{GetType().Name}: Name={Name ?? \"(null)\"}, Date={Date ?? \"(null)\"}";
    }
}

// Top-level derived class (not nested)
public class CertifiedLetter : Letter
{
    public string TrackingNumber { get; set; }   // extra property

    public CertifiedLetter() : base() { }        // default constructor

    // override ToString to include tracking number
    public override string ToString()
    {
        return $"{GetType().Name}: Name={Name ?? \"(null)\"}, Date={Date ?? \"(null)\"}, TrackingNumber={TrackingNumber ?? \"(null)\"}";
    }
}

Apparently this is the answer? thank you again. !close

Accord•2mo ago

Closed!

strikeouts27OP•2mo ago

is there a command for keeping track of the questions and answers !summary

Pobiega•2mo ago

No. That would likely involve AI usage and thus cost money to host, and this entire discord is entirely unsponsored and volounteer driven, so sadly thats not available. A good idea thou.

Timmy•2mo ago

Wouldn't it be good to simply have a command for posts in the #help channel to mark a post as completed, and include a title and message as the final answer? Then you could sorta lookup posts that were already closed via some other command. That being said, that's essentially stack overflow or google..

Pobiega•2mo ago

Well, most questions we get here are more complicated than that, and the answer is very rarely a single post. So either the asker, a helper or an AI has to write a summary regardless

strikeouts27OP•2mo ago

!close

Accord•2mo ago

Closed!

Gaming

Programming

✅ Can someone help me understand GetType()

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