using System;

using System.Collections.Generic;                   

using System.Linq;

using System.Text.RegularExpressions;

using Microsoft.Extensions.Logging;

using System;

using System.Collections;

using System.Collections.Generic;

using System.Data;

using System.Diagnostics;

using System.Linq;

using System.Net.Http;

using System.Text.RegularExpressions;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        var partnerId = GetValueBad<int?>();

        if(partnerId.HasValue)

            Console.WriteLine(partnerId.Value);

​

    }

    public static T GetValue<T>()

    {

            var t = typeof(T);

            var genericValue = 33591572;

​

            if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))

            {

                t = Nullable.GetUnderlyingType(t);

            }

​

            if (genericValue == null) return default;

            return (T)Convert.ChangeType(genericValue, t);

    }

    public static T GetValueBad<T>()

    {

            var genericValue = 33591572;

            if (genericValue == null) return default;

            return (T)Convert.ChangeType(genericValue, typeof(T));

    }

}

​

​