AzureMgmtFluentNsgs.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Microsoft.Azure.Management.Fluent;
using Microsoft.Azure.Management.Network;
using Microsoft.Azure.Management.Network.Fluent;

namespace AzureManagmentExample
{
    public class NsgService
    {
        Microsoft.Azure.Management.Network.Fluent.NetworkManager networkManager;
        IAzure azure;
        Dictionary<string, object> nsgsProperties;
        public NsgService()
        {
            azure = Azure.Authenticate("{your authentication file}").WithDefaultSubscription();
        }

        public string GetNetworkId(string networkName) => azure.Networks.List().FirstOrDefault(n => n.Name == networkName)?.Id;
        
        public Dictionary<string, object> GetSubnetsNSGs(string networkId)
        {
            nsgsProperties = new Dictionary<string, object>();

            foreach (var subnet in azure.Networks.GetById(networkId).Subnets)
            {
                var nsg = subnet.Value.GetNetworkSecurityGroup();
                foreach (var currentRule in nsg.SecurityRules)
                {
                    var dict = new Dictionary<string, object>();
                    foreach (var property in typeof(INetworkSecurityRule).GetProperties())
                    {
                        var value = property.GetValue(currentRule.Value);
                        dict.Add(property.Name, value);
                    }
                    nsgsProperties.Add(nsg.Key, dict);
                }
            }

            return nsgsProperties;
        }
    }
}