MinimumClientVersionFilter.cs

using Microsoft.AspNetCore.Mvc.Filters;

namespace VersionCheck.API.VersionCheck
{
    public class MinimumClientVersionFilter : IActionFilter
    {
        private readonly IVersionCheckService _versionCheckHelper;

        public MinimumClientVersionFilter(IVersionCheckService versionCheckHelper)
        {
            _versionCheckHelper =  versionCheckHelper;
        }

        public void OnActionExecuting(ActionExecutingContext context)
        {
            _versionCheckHelper.PerformVersionCheck(context.HttpContext.Request);
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
        }
    }
}

ValuesController.cs

using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using VersionCheck.API.VersionCheck;

namespace VersionCheck.API.Controllers
{
    [ServiceFilter(typeof(MinimumClientVersionFilter))]
    [Route("api/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        // GET api/values
        [HttpGet]
        public ActionResult<IEnumerable<string>> Get()
        {
            return new string[] { "value1", "value2" };
        }
    }
}