Add built-in value converters for IPAddress

[ralmsdeveloper]

Resolve: #18662

[ralmsdeveloper]

@ajcvickers, could you confirm if this is the best way?

I did some tests and they were satisfactory.

using System;
using System.Linq;
using System.Net;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;

namespace Converters
{
    class Program
    {
        static void Main(string[] args)
        {
            using var db = new SampleContext();
            db.Database.EnsureDeleted();
            db.Database.EnsureCreated();

            db.Set<Test>().Add(new Test
            {
                IPAddressToString1 = new IPAddress(new byte[] { 255, 255, 255, 0 }),
                IPAddressToBytes1 = new IPAddress(new byte[] { 10, 10, 10, 1 }),
                IPAddressToString2 = IPAddress.Parse("255.255.255.0"),
                IPAddressToBytes2 = IPAddress.Parse("10.10.10.1")
            });
            db.SaveChanges();

            var ip = db.Set<Test>().AsNoTracking().Select(p =>
                new
                {
                    p.IPAddressToString1,
                    p.IPAddressToBytes1,
                    p.IPAddressToString2,
                    p.IPAddressToBytes2,
                }).ToArray();

            var sql = db.Database.GenerateCreateScript();

            Console.WriteLine("Hello World!");
        }
    }

    class SampleContext : DbContext
    {
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer("..");
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Test>()
                .Property(p => p.IPAddressToString1)
                .HasConversion<string>();

            modelBuilder.Entity<Test>()
                .Property(p => p.IPAddressToBytes1)
                .HasConversion<byte[]>();

            modelBuilder.Entity<Test>()
                .Property(p => p.IPAddressToString2)
                .HasConversion(new IPAddressToStringConverter());

            modelBuilder.Entity<Test>()
                .Property(p => p.IPAddressToBytes2)
                .HasConversion(new IPAddressToBytesConverter());
        }
    }

    class Test
    {
        public int Id { get; set; }
        public IPAddress IPAddressToString1 { get; set; }
        public IPAddress IPAddressToBytes1 { get; set; }
        public IPAddress IPAddressToString2 { get; set; }
        public IPAddress IPAddressToBytes2 { get; set; }
    }
}

Script:

CREATE TABLE [Test] (
    [Id] int NOT NULL IDENTITY,
    [IPAddressToString1] nvarchar(max) NULL,
    [IPAddressToBytes1] varbinary(max) NULL,
    [IPAddressToString2] nvarchar(max) NULL,
    [IPAddressToBytes2] varbinary(max) NULL,
    CONSTRAINT [PK_Test] PRIMARY KEY ([Id])
);
GO

[ajcvickers]

A few comments, but in general looks good.

[ralmsdeveloper]

@ajcvickers
I made some adjustments, see if it looks good to you!

[ralmsdeveloper]

@ajcvickers is here some links that you can get IPv6

https://www.mediawiki.org/wiki/Help:Range_blocks/IPv6
https://www.ultratools.com/tools/ipv4toipv6

[ralmsdeveloper]

@ajcvickers,
if you find the time, could you look at that? I would like to end this weekend.

[ajcvickers]

Thanks @ralmsdeveloper!