LimitedString, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            LimitedString myString1 = "0123456789";
            LimitedString myString2 = new LimitedString("0123456789", 10);
            LimitedString myString3 = new LimitedString(myString1 + myString2 + myString1 + myString2, 20);
        }
    }
    
    public class LimitedString
    {
        private readonly string value;
        private readonly long maxLength;
        
        public LimitedString(string value, long maxLength = long.MaxValue)
        {
            if(value != null && value.Length > maxLength)
                throw new InvalidOperationException("Value is longer than max length");
            this.value = value;
            this.maxLength = maxLength;
        }
        
        public override string ToString()
        {
            return value;
        }
        
        public override int GetHashCode()
        {
            return value.GetHashCode();
        }
        
        public override bool Equals(object o)
        {
            if(o is LimitedString)
                return value == ((LimitedString)o).value;
            return false;
        }
        
        public static implicit operator LimitedString(string str)
        {
            return new LimitedString(str);
        }
        
        public static implicit operator String(LimitedString ls)
        {
            return ls.value;
        }
        
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 15 Mb, average nr of threads: 3, absolute service time: 0,26 sec