Puede intentar usar TempData y vista parcial, aquí hay una demostración:

Modelo:

 public class LoopModel{ public List<string> l { get; set; } public int count { get; set; } }

Acción:

 [HttpGet] public IActionResult TestLoop() { LoopModel loopModel = new LoopModel { l = new List<string> { "s1", "s2", "s3", "s4", "s5" }, count = 0 }; TempData["model"] =JsonConvert.SerializeObject(loopModel); return View(); } [HttpPost] public IActionResult TestLoop(int count) { var s = TempData.Peek("model").ToString(); LoopModel loopModel = JsonConvert.DeserializeObject<LoopModel>(TempData.Peek("model").ToString()); if(count<loopModel.l.Count()) loopModel.count = count; return PartialView("Partial1",loopModel); }

TestLoop.cshtml:

 @using Newtonsoft.Json; <div id="myDiv"> @await Html.PartialAsync("Partial1", JsonConvert.DeserializeObject<LoopModel>(TempData.Peek("model").ToString())) </div> <button onclick="AddContent()">next</button> @section Scripts { <script> var count = 0; function AddContent() { count++; $.ajax({ type: "POST", url: '?count=' + count, success: function (result) { $("#myDiv").html(result); } }); } </script> }

Parcial1:

 @model LoopModel @for (var i = 0; i <= Model.count; i++) { <div class="container">@Model.l[i]</div> }

resultado: