How to get mx records for a dns name with System.Net.DNS?

Question

Is there any built in method in the .NET library that will return all of the MX records for a given domain? I see how you get CNAMES, but not MX records.

Answer 1

The accepted answer doesn't work for .NET framework < 4.5, so would suggest that those of you who can't use ARSOFT.Tools can use DNDNs from https://dndns.codeplex.com

Given below is a console application that returns the MX record for a given domain modifying their examples.

using System;
using System.Net.Sockets;
using DnDns.Enums;
using DnDns.Query;
using DnDns.Records;

namespace DnDnsExamples
{
class Program
{
    static void Main(string[] args)
    {
        DnsQueryRequest request3 = new DnsQueryRequest();
        DnsQueryResponse response3 = request3.Resolve("gmail.com", NsType.MX, NsClass.INET, ProtocolType.Tcp);
        OutputResults(response3);
        Console.ReadLine();
    }

    private static void OutputResults(DnsQueryResponse response)
    {
        foreach (IDnsRecord record in response.Answers)
        {
            Console.WriteLine(record.Answer);
            Console.WriteLine("  |--- RDATA Field Length: " + record.DnsHeader.DataLength);
            Console.WriteLine("  |--- Name: " + record.DnsHeader.Name);
            Console.WriteLine("  |--- NS Class: " + record.DnsHeader.NsClass);
            Console.WriteLine("  |--- NS Type: " + record.DnsHeader.NsType);
            Console.WriteLine("  |--- TTL: " + record.DnsHeader.TimeToLive);
            Console.WriteLine();
        }            
    }
}
}