创建操作的下拉列表

本文关键字：下拉列表 操作 创建 | 更新日期: 2023-09-27 18:33:26

我在创建操作的视图中创建下拉列表时遇到问题。该视图仅显示学生编号、标题和描述的字段，而不显示计划和类别下拉列表的任何字段。我不确定如何创建选择列表并将其传递给视图。我不知道做对不对。

    public class ServiceForm
    {
        [Required]
        [Display(Name="Student Number")]
        public int student_number { get; set; }
        [Required]
        [Display(Name="Program")]
        public SelectList program { get; set; }
        [Required]
        [Display(Name = "Title")]
        public string title { get; set; }
        [Required]
        [Display(Name = "Description")]
        public string description { get; set; }
        [Required]
        [Display(Name = "Category")]
        public SelectList category { get; set; }
    }
    public class Program
    {
        public int id { get; set; }
        public string program_code { get; set; }
        public string program_desc { get; set; }
    }
    public IEnumerable<ProgramList> GetAllPrograms()
    {
        var s = ds.programs.OrderBy(m => m.program_code);
        return AutoMapper.Mapper.Map<IEnumerable<ProgramList>>(s);
    }
    private ServiceManager m = new ServiceManager();
    private ProgramManager pm = new ProgramManager();

    [HttpGet]
    public ActionResult Create()
    {
        ServiceForm form = new ServiceForm();
        form.program = new SelectList(pm.GetAllPrograms(), "id", "program_code");
        List<SelectListItem> cat = new List<SelectListItem>();
        cat.Add(new SelectListItem() { Text = "General", Value = "General", Selected = true });
        cat.Add(new SelectListItem() { Text = "Grades", Value = "Grades", Selected = false });
        cat.Add(new SelectListItem() { Text = "Time Table", Value = "TimeTable", Selected = false });
        cat.Add(new SelectListItem() { Text = "Zenit Account", Value = "Zenit", Selected = false });
        form.program = new SelectList(cat, cat.ElementAt(0));
        return View(form);
    }
    [HttpPost]
    public ActionResult Create(ServiceAdd newService)
    {
        if (!ModelState.IsValid)
        {
            var reform = AutoMapper.Mapper.Map<ServiceForm>(newService);
            reform.program = new SelectList(pm.GetAllPrograms(), "id", "program_code");
            List<SelectListItem> cat = new List<SelectListItem>();
            cat.Add(new SelectListItem() { Text = "General", Value = "General", Selected = true });
            cat.Add(new SelectListItem() { Text = "Grades", Value = "Grades", Selected = false });
            cat.Add(new SelectListItem() { Text = "Time Table", Value = "TimeTable", Selected = false });
            cat.Add(new SelectListItem() { Text = "Zenit Account", Value = "Zenit", Selected = false });
            reform.program = new SelectList(cat, cat.ElementAt(0));
            return View(reform);
        }
        return RedirectToAction("Create");
    }

创建操作的下拉列表

模型 

 public class ServiceForm
        {
            [Required]
            [Display(Name="Student Number")]
            public int student_number { get; set; }
            [Required]
            [Display(Name="Program")]
            public SelectList Programs { get; set; }
            public string SelectedProgram { get; set; }
            [Required]
            [Display(Name = "Title")]
            public string title { get; set; }
            [Required]
            [Display(Name = "Description")]
            public string description { get; set; }
            [Required]
            [Display(Name = "Category")]
            public SelectList Categories{ get; set; }
            public string SelectedCategory { get; set; }
        }

控制器

[HttpGet]
public ActionResult Create()
{
    ServiceForm form = new ServiceForm();

    List<SelectListItem> cat = new List<SelectListItem>();
    cat.Add(new SelectListItem { Text = "General", Value = "General", Selected = true });
    cat.Add(new SelectListItem { Text = "Grades", Value = "Grades", Selected = false });
    cat.Add(new SelectListItem { Text = "Time Table", Value = "TimeTable", Selected = false });
    cat.Add(new SelectListItem { Text = "Zenit Account", Value = "Zenit", Selected = false });
    form.Categories = cat; 
    //fill Programs property here...
    return View(form);
}

视图

@model ServiceForm
@using(Html.BeginForm(...))
{
     @Html.LabelFor(m=>m.Programs)
     @Html.DropDownFor(x => x.SelectedProgram , Model.Programs)
     @Html.LabelFor(m=>m.Categories)
     @Html.DropDownFor(x => x.SelectedCategory, Model.Categories)
}

您可以在控制器中执行以下操作：

public ActionResult Create()
{
    var data = new ServiceForm();
    data.Categories = new SelectList({"1", "category1"}, {"2", "category2"});
    return View(data);
}
[HttpPost]
public ActionResult Create(ServiceForm form)
{
     // validate the input and save
}

在您的 Razor 视图中，您有如下所示的内容：

@model ServiceForm
@using(Html.BeginForm())
{
     @Html.DropDownFor(x => x.SelectedCategory, Model.Categories)
     <!-- ... other fields and labels -->
}
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