将列表（ASP-ITEMS）发送到会话，ASP.NET

Question

我正在尝试根据用户角色更改用户看到的选择。 示例：如果用户是管理员，请选择为：admin，system，....

我首先创建了以下内容：

public List<SelectListItem> Selection { get; set; }

然后：

public IActionResult Recht()
{
    if (UserModel.RECHT.Equals(50))
    {
        Selection.Add(new SelectListItem { Value = "SY", Text = "System" });
        Selection.Add(new SelectListItem { Value = "AD", Text = "Admin" });
        Selection.Add(new SelectListItem { Value = "ID", Text = "Innendienst" });
        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
      


    }
    if (UserModel.RECHT.Equals(40))
    {
        Selection.Add(new SelectListItem { Value = "AD", Text = "Admin" });
        Selection.Add(new SelectListItem { Value = "ID", Text = "Innendienst" });
        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
    }
    if (UserModel.RECHT.Equals(30))
    {
        Selection.Add(new SelectListItem { Value = "ID", Text = "Innendienst" });
        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
    }
    if (UserModel.RECHT.Equals(20))
    {

        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
    }
    if (UserModel.RECHT.Equals(10))
    {

        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
        UserRoleMessage = string.Join(",", Selection);
        HttpContext.Session.SetString("UserRoleMessage", UserRoleMessage);
    }
    

    UserRoleMessage = Convert.ToString(UserModel.RECHT);
    HttpContext.Session.SetString("UserRoleMessage", UserRoleMessage);


    return Page();


}

当我运行代码时，我仍然会得到一个空的选择。

Answer 1

如果要在页面加载时设置选择，则可以在onget中调用recht：

public void OnGet()
        {
            Recht();
        }

如果要使用表单将usermodel.recht传递给处理程序，然后更改值选择，这是一个演示：

表格：

<form method="get" asp-page-handler="Recht">
    <input asp-for="UserModel.RECHT" />
    <input type="submit" value="submit"/>
</form>

处理程序：

[BindProperty]
public UserModel UserModel{get;set;}
public IActionResult OnGetRecht()
{
    if (UserModel.RECHT.Equals(50))
    {
        Selection.Add(new SelectListItem { Value = "SY", Text = "System" });
        Selection.Add(new SelectListItem { Value = "AD", Text = "Admin" });
        Selection.Add(new SelectListItem { Value = "ID", Text = "Innendienst" });
        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
      


    }
    if (UserModel.RECHT.Equals(40))
    {
        Selection.Add(new SelectListItem { Value = "AD", Text = "Admin" });
        Selection.Add(new SelectListItem { Value = "ID", Text = "Innendienst" });
        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
    }
    if (UserModel.RECHT.Equals(30))
    {
        Selection.Add(new SelectListItem { Value = "ID", Text = "Innendienst" });
        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
    }
    if (UserModel.RECHT.Equals(20))
    {

        Selection.Add(new SelectListItem { Value = "SP", Text = "Spediteur" });
        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
    }
    if (UserModel.RECHT.Equals(10))
    {

        Selection.Add(new SelectListItem { Value = "DS", Text = "Disponent" });
        UserRoleMessage = string.Join(",", Selection);
        HttpContext.Session.SetString("UserRoleMessage", UserRoleMessage);
    }
    

    UserRoleMessage = Convert.ToString(UserModel.RECHT);
    HttpContext.Session.SetString("UserRoleMessage", UserRoleMessage);


    return Page();


}