Passing list of models from one page to controller - razor

Question

I've tried to pass a list of models to controller but with no luck. I have a problem with generating empty view and then pass values from filled forms to controller. What I have:
Models
public class PostsModel
{
[Required]
[DataType(DataType.DateTime)]
public DateTime PublishDate { get; set; }
[Required]
public List<PostModel> Posts { get; set; }
}
public class PostModel
{
public string Language {get;set;}
public string X {get;set;}
public string Y {get;set;}
// and other properties
}
Controller
public IActionResult New()
{
ViewData["ButtonName"] = "Add";
return View(new PostsModel { PublishDate = DateTime.UtcNow });
}
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> New(PostsModel model)
{
if (ModelState.IsValid)
{
// some code
// never reaches this point
}
return View(model);
}
Form:
<form method="post">
<h4>XYZ</h4>
<hr />
#{
Model.Posts = new List<PostModel>(2);
for (var i = 0; i < 2; i++)
{
Model.Posts.Add(new PostModel());
}
foreach (var test in Model.Posts)
{
<h4>xyz</h4>
<div class="form-group">
<label asp-for="#test.Subject">Temat</label>
<input asp-for="#test.Subject" class="form-control" />
<span asp-validation-for="#test.Subject" class="text-danger"></span>
</div>
}
}
<button type="submit" class="btn btn-primary">#ViewData["ButtonName"]</button>
</form>
Of course model is never valid. I don't have an idea how to do such functionality.

Answer 1

As #StephenMuecke said, using for-loop is working approach. In this particular problem that I had it's enough to do:
Controller:
public IActionResult New()
{
ViewData["ButtonName"] = "Add";
// example:
return View(new PostsModel { PublishDate = DateTime.UtcNow, Posts = new List<PostModel>(2) { new PostModel(), new PostModel() } });
}
View:
for (var i = 0; i < Model.Posts.Count; i++)
{
<h4>xyz</h4>
<div class="form-group">
<label asp-for="#Model.Posts[i].Subject">Temat</label>
<input asp-for="#Model.Posts[i].Subject" class="form-control" />
<span asp-validation-for="#Model.Posts[i].Subject" class="text-danger"></span>
</div>
#*and so one*#
}
I also want to thank M. Kostrzewski and M. Kaletka who also helped me on some .net group