Question

我使用递归函数使用字符串列表绑定下拉列表我的下拉有价值家家居GT;＆GT;厨房家居GT;＆GT;厨房及GT;＆GT; ABC

我想在数据库中使用相同的下拉值ABC

这是我的查看代码

@{
    ViewBag.Title = "Createnewproduct";
}
<h2>
    Create new product</h2>
<div>
    @using (Html.BeginForm("Createnewproduct", "ProductAdmin", FormMethod.Post, new { id = "sendFileForm", enctype = "multipart/form-data" }))
    {
        <table>
            <tr>
                <td>
                    Category
                </td>
                <td>
                    @Html.DropDownList("Test", new SelectList(ViewBag.ListOfDisciplines, Model))
                </td>
            </tr>
            <tr>
                <td>
                    Product Name
                </td>
                <td>
                    <input type="text" name="ProductName">
                </td>
            </tr>
            <tr>
                <td>
                    Product Description
                </td>
                <td>
                    <input type="text" name="ProductDescription">
                </td>
            </tr>
            <tr>
                <td>
                    Product long Description
                </td>
                <td>
                    <input type="text" name=" ProductlongDescription">
                </td>
            </tr>
            <tr>
                <td>
                    UPC
                </td>
                <td>
                    <input type="text" name="UPC">
                </td>
            </tr>
            <tr>
                <td>
                    SKU
                </td>
                <td>
                    <input type="text" name="SKU">
                </td>
            </tr>
            <tr>
                <td>
                    Stock
                </td>
                <td>
                    <input type="text" name="Stock">
                </td>
            </tr>
            <tr>
                <td>
                    Weight
                </td>
                <td>
                    <input type="text" name="Weight">
                </td>
            </tr>
            <tr>
                <td>
                    Height
                </td>
                <td>
                    <input type="text" name="Height">
                </td>
            </tr>
            <tr>
                <td>
                    Image URL
                </td>
                <td>
                    <input type="file" name="file" id="file" style="width: 100%;" id="Imageupload" />
                </td>
            </tr>
            <tr>
                <td rowspan="2">
                    <input type="submit" value="Save" />
                </td>
            </tr>
        </table>
    }
</div>

和我的控制器一样

[AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Createnewproduct(FormCollection form)
        {

        }

当我看到我的FormCollection值时，我没有找到下拉值，所有其他值在FormCollection中正确找到

如果我在这段代码中犯了错误，请帮助我

 public ActionResult Createnewproduct()
    {
        List<Category> categorylist = _Listofcategory();
        var parentcate = categorylist.Where(c => c.ParentCategoryId == 1).ToList();
        List<String> categoryList = new List<string>();
        string prefix = ">>";
        foreach (var item in parentcate)
        {
            prefix = item.CategoryName;
            Setchild(prefix, item, categorylist, categoryList);


        }

        ViewBag.ListOfDisciplines = categoryList;
        return View();
    }


    private void Setchild(string prefix, Category model, List<Category> listcategory, List<string> catStrings)
    {
        var childs = listcategory.Where(x => x.ParentCategoryId == model.CategoryId).ToList();

        catStrings.Add(prefix);
        if (childs.Count > 0)
        {

            foreach (var child in childs)
            {
                catStrings.Add(prefix + ">>" + child.CategoryName);
                var subchild = listcategory.Where(c => c.ParentCategoryId == child.CategoryId).ToList();
                if (subchild.Count > 0)
                {
                    foreach (var subsubchild in subchild)
                    {
                        catStrings.Add(prefix + ">>" + child.CategoryName + ">>" + subsubchild.CategoryName);

                        var subsubsubchild = listcategory.Where(c => c.ParentCategoryId == subsubchild.CategoryId).ToList();
                        if (subsubsubchild.Count > 0)
                        {
                            foreach (var subsubsubsubchild in subsubsubchild)
                            {
                                catStrings.Add(prefix + ">>" + child.CategoryName + ">>" + subsubchild.CategoryName + ">>" + subsubsubsubchild.CategoryName);
                            }
                        }
                    }
                }


            }

        }

    }

这是我的分类列表如何在View模型中使用。

请告诉我

Answer 1

您也可以在场景中使用下面提到的示例代码。我使用过ViewModel。

域名模型：

 public class Product
    {
        public Product() { Id = Guid.NewGuid(); Created = DateTime.Now; }
        public Guid Id { get; set; }
        public string ProductName { get; set; }

        public virtual ProductCategory ProductCategory { get; set; }
    }

 public class ProductCategory
    {
        public int Id { get; set; }
        public string CategoryName { get; set; }

        public virtual ICollection<Product> Products { get; set; }
    }

查看型号：

public class ProductViewModel
    {
        public Guid Id { get; set; }

        [Required(ErrorMessage = "required")]
        public string ProductName { get; set; }

        public int SelectedValue { get; set; }

        public virtual ProductCategory ProductCategory { get; set; }

        [DisplayName("Product Category")]
        public virtual ICollection<ProductCategory> ProductCategories { get; set; }
    }

行动方法：

 [HttpGet]
        public ActionResult AddProduct() //generate view with categories for enter product data
        {
            //for get product categories from database
            var prodcutCategories = Repository.GetAllProductCategories();

            //for initialize viewmodel
            var productViewModel = new ProductViewModel();

            //assign values for viewmodel
            productViewModel.ProductCategories = prodcutCategories;

            //send viewmodel into UI (View)
            return View("AddProduct", productViewModel);
        }

        [HttpPost]
        public ActionResult AddProduct(ProductViewModel productViewModel) //save entered data
        {
            //get product category for selected drop down list value
            var prodcutCategory = Repository.GetProductCategory(productViewModel.SelectedValue);

            //for get all product categories
       var prodcutCategories = Repository.GetAllProductCategories();

            //for fill the drop down list when validation fails 
             productViewModel.ProductCategories = prodcutCategories;

            //for initialize Product domain model
            var productObj = new Product
                                     {
                                         ProductName = productViewModel.ProductName,
                                         ProductCategory = prodcutCategory,
                                     };

            if (ModelState.IsValid) //check for any validation errors
            {
                //save recived data into database
                Repository.AddProduct(productObj);
                return RedirectToAction("AddProduct");
            }
            else
            {
                //when validation failed return viewmodel back to UI (View) 
                return View(productViewModel);
            }
        }

查看：

@model YourProject.ViewModels.ProductViewModel        //set your viewmodel here

 <div class="boxedForm">

@using (Html.BeginAbsoluteRouteForm("add", new { action = "AddProduct"},FormMethod.Post }))
         {
             <ul>
                     <li style="width: 370px">
                           @Html.LabelFor(m => m.ProductCategories)
   @Html.DropDownListFor(m => m.SelectedValue,new SelectList(Model.ProductCategories, "Id",
                                             "CategoryName"),"-Please select a category -")
                           @Html.ValidationMessageFor(m => m.ProductCategory.Id)
                    </li>
                    <li style="width: 370px">
                  @Html.CompleteEditorFor(m => m.ProductName, labelOverride: "Product Name")
                  @Html.ValidationMessageFor(m => m.ProductName) 
                    </li>
            </ul>
                    <div class="action">
                        <button class="actionButton" type="submit">
                            <span>Save</span></button>
                    </div>
         }
   </div>

最终输出

enter image description here

如果您对上述代码段有任何疑问，请告诉我们。我写了关于ViewModel的整篇文章，它在这里：How to Use ViewModel with ASP.NET MVC 。

我希望这会对你有所帮助。

Answer 2

假设您的ViewBag.ListOfDisciplines是List<Discipline>而您的纪律课程是：

public class Discipline {
     public int Id { get; set; }
     public string Name { get; set; }
}

如果您有一个字符串列表，您可以在控制器端的匿名数组中对其进行转换

ViewBag.ListOfDIsciplines = from d in ListDisciplines select new { Id = d, Name = d };

在您的视图中，您应该使用

@Html.DropDownList("Test", new SelectList(ViewBag.ListOfDisciplines, "Id", "Name"), "-- Select here --")

如何在MVC中获取Controller中的下拉值

2 个答案: