model property is not passed to controller action - asp.net-core

Question

What is my mistake? AllFindedBrands property is not passing to SearchBrandResult Action of Controller
Controller:
public async Task<IActionResult> Search(string Articul, int idClient)
{
List<BrandList> findedBrands = new List<BrandList>();
#ViewBag.list = woDupes;
SearchViewModel model = new SearchViewModel();
model.Articul = Articul;
model.idClient = idClient;
model.AllFindedBrands = new List<BrandList>(findedBrands);
return View(model);
}
[HttpPost]
public async Task<IActionResult> SearchBrandResult(SearchViewModel model)
{
return View();
}
View:
<form asp-controller="Search" asp-action="SearchBrandResult" asp-route-
Articul="#Model.Articul"
asp-route-AllFindedBrands="#Model.AllFindedBrands" asp-route-
idClient="#Model.idClient" method="post" enctype="multipart/form-data">
<select asp-for="SelectedBrand" asp-items="#(new SelectList(#ViewBag.list,
nameof(FindedBrand.Name),
nameof(FindedBrand.Name)))"
multiple="true" class="form-control brand-chosen">
</select>
<input type="submit" />
All other properties of ViewModel is successfully passed to th Action

Answer 1

AllFindedBrands is type of complex model and asp-route-* cannot dynamic bind the value. You can F12 in the browser to check the generated url in the form.
Two ways you can follow:
1.By using asp-all-route-data and foreach the AllFindedBrands to bind the value which passes the value by route data.
Assume your model like below:
public class SearchViewModel
{
public string Articul { get; set; }
public string idClient { get; set; }
public List<BrandList> AllFindedBrands { get; set; }
public List<string> SelectedBrand { get; set; }
}
public class BrandList
{
public string Name { get; set; }
}
View(For easy testing, I just hard-coded the dropdownlist):
#model SearchViewModel
#{
var data = new Dictionary<string, string>();
for(int i=0;i<Model.AllFindedBrands.Count();i++)
{
data.Add("AllFindedBrands[" + i + "].Name", Model.AllFindedBrands[i].Name);
}
}
<form asp-action="SearchBrandResult" asp-route-Articul="#Model.Articul" asp-all-route-data="#data" asp-route-idClient="#Model.idClient" method="post" enctype="multipart/form-data">
<select asp-for="SelectedBrand" multiple="true" class="form-control brand-chosen">
<option value="aaa">aaa</option>
<option value="bbb">bbb</option>
<option value="ccc">ccc</option>
</select>
<input type="submit" />
</form>
2.By listing the property and make them hidden inputs which passes the value by form data:
#model SearchViewModel
<form asp-action="SearchBrandResult" asp-route-Articul="#Model.Articul" asp-route-idClient="#Model.idClient" method="post" enctype="multipart/form-data">
#for (int i = 0; i < Model.AllFindedBrands.Count(); i++)
{
<input asp-for="#Model.AllFindedBrands[i].Name" hidden />
}
<select asp-for="SelectedBrand" multiple="true" class="form-control brand-chosen">
<option value="aaa">aaa</option>
<option value="bbb">bbb</option>
<option value="ccc">ccc</option>
</select>
<input type="submit" />
</form>