使用@ Html.DropDownListFor进行会话绑定

Question

我的控制器中有以下一种方法

码

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

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

        ViewBag.Company = listOfCompanies;

查看页面

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

这工作正常，我试图在这里使用会话而不是viewbag。

所以我做到了

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

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

        Session["CompanyData"] = listOfCompanies;

查看页面

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

但这不能正常工作，实现这一目标的途径是什么

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" })