c# – MVC疯狂财产失去了它的价值. Html.HiddenFor bug？

FrmNextStep('<Login>',...
(where Model.SelectedUser.Login is used)

一旦形式的

<input id="SelectedLogin" name="SelectedLogin" value="<Login>" type="hidden">
(where "Model".SelectedLogin is used)

但第二个总是留空.
这真的很奇怪,因为尽管两个调用不完全相同,但返回值应该是.

if (Model.SelectedUser != null)
{
    <span>Some value</span>
    <script type="scriptADResultComplete">
    @{
        var script = String.Format(
            @"FrmNextStep('{0}','{1}','{2}');",Model.SelectedUser.Login.Replace("'",@"'"),Model.SelectedUser.FirstName.Replace("'",Model.SelectedUser.LastName.Replace("'",@"'")
        );

        @Html.Raw(script);
    }
    </script>
}

<input type="hidden" name="hfAction" />
<input type="hidden" name="hfUserLogin" />
@Html.HiddenFor(m => m.CurrentPage,new { id = "hfCurrentPage" })
@Html.HiddenFor(m => m.SelectedLogin);


    private User selectedUser;
    public User SelectedUser
    {
        get
        {
            if (this.selectedUser == null)
            {
                this.selectedUser = this.AllUsers.FirstOrDefault(user => user.Selected) ?? User.DefaultUser;
            }

            if (this.selectedUser == User.DefaultUser)
            {
                return null;
            }

            return this.selectedUser;
        }
        set
        {
            this.AllUsers.ForEach(user => user.Selected = (user == value));

            this.selectedUser = null;
        }
    }

    public string SelectedLogin
    {
        get
        {
            return (this.SelectedUser ?? User.DefaultUser).Login;
        }
        set
        {
            this.SelectedUser = this.AllUsers.FirstOrDefault(user => user.Login == value);
        }
    }

当我调试代码时,在“呈现”阶段唯一调用选定登录并返回正确的登录.

Html.HiddenFor有什么错误吗？