using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Success?");

        var result = ReturnSuccess();

        if (result.Success){ 

            Console.WriteLine("Success!"); 

            Console.WriteLine("Successful result: {0}", result.Result);

        }

        else { 

            Console.WriteLine("Failure!"); 

            Console.WriteLine("My error: {0}: ", result.Error);

            Console.WriteLine("My exception: {0}", result.Ex);

        }

​

        Console.WriteLine("\nError?");

        result = ReturnError(); 

        if (result.Success){ Console.WriteLine("Success!"); }

        else { 

            Console.WriteLine("Error!"); 

            Console.WriteLine("My error: {0}: ", result.Error);

            Console.WriteLine("My exception: {0}", result.Ex);

        }

        Console.WriteLine("\nException?");

        result = ReturnErrorAndException();

        if (result.Success){ Console.WriteLine("Success!"); }

        else { 

            Console.WriteLine("Exception!"); 

            Console.WriteLine("My error: {0}: ", result.Error);

            Console.WriteLine("My exception: {0}", result.Ex);

        }       

    }

    public static ResultObject<string> ReturnError()

    {

        return new ResultObject<string>(Error: "hej");

    }

    public static ResultObject<string> ReturnSuccess()

    {

        return new ResultObject<string>(Result: "hej");

    }

    public static ResultObject<string> ReturnErrorAndException()

    {

        return new ResultObject<string>(Error: "hej", new ArgumentException());

    }

}

​

    public class ResultObject<T>

    {

        public ResultObject(T Result)

        {

            if (Result is null) { throw new ArgumentNullException(nameof(Result), $"{nameof(Result)} cannot be null"); }

            this.Result = Result;

        }

​

        public ResultObject(string Error)

        {

            if (string.IsNullOrWhiteSpace(Error)) { throw new ArgumentException("Error message can't be null, empty or only whitespace characters!"); }

            this.Error = Error;

        }

        public ResultObject(string Error, Exception Ex)

        {

            if (string.IsNullOrWhiteSpace(Error)) { throw new ArgumentException("Error message can't be null, empty or only whitespace characters!"); }

            this.Error = Error;

            this.Ex = Ex;

        }

​

        public bool Success { get => Result is not null; }

        #nullable enable

        public T? Result { get; init; }

        public string? Error { get; init; }

        public Exception? Ex { get; init; }

        #nullable disable

    }