session bind with @Html.DropDownListFor

Question

I have one of a method as following in my controller

Code

        var companies = ...
        List<CompanyModel> listOfCompanies = new List<CompanyModel>();

        foreach (var item in companies)
        {
             listOfCompanies.Add(new CompanyModel(item.CompanyId, item.CompanyName));
        }

        ViewBag.Company = listOfCompanies;

View page

 @Html.DropDownListFor(m => m.Company, new SelectList(ViewBag.Company, "id", "name"), "Select company", new { @class = "form-control" })

this is working fine , I'm trying trying to use session instead of viewbag here.

So for that I did

        var companies = ...
        List<CompanyModel> listOfCompanies = new List<CompanyModel>();

        foreach (var item in companies)
        {
            listOfCompanies.Add(new CompanyModel(item.CompanyId, item.CompanyName));
        }

        Session["CompanyData"] = listOfCompanies;

View page

  @Html.DropDownListFor(m => m.Company, new SelectList(Model.Company, "id", "name", Session["CompanyData"]), "Select company", new { @class = "form-control" })

but this is not working properly, whats the path to achieve this

Answer 1

您是否尝试过简单地将Session替换为ViewBag ？

@Html.DropDownListFor(m => m.Company, new SelectList((List<CompanyModel>)Session["CompanyData"], "id", "name"), "Select company", new { @class = "form-control" })