Question

我有一个控制器用于我的网站仪表板，一个用于返回类别的操作作为要查看的列表和另一个用于创建新类别的操作

我的行动：

         public ActionResult Categories() {
             return View(db.Categories.OrderBy(Categories => Categories.Name).ToList());
         }

         [HttpPost]
         public RedirectToRouteResult NewCategory(string name, string address, string parentId) {
             if (ModelState.IsValid) {
                 int? ParentID = null;
                 if (parentId != "null") {
                     ParentID = parentId.AsInt();
                 }
                 Category oCategory = new Category();
                 oCategory.Name = name;
                 oCategory.Address = address;
                 oCategory.ParentID = ParentID;
                 db.Categories.Add(oCategory);
                 db.SaveChanges();
                 db.Dispose();
                 db = null;
             }
             return RedirectToAction("Categories");
         }

在类别视图中，我有一个纯html表单来获取用户输入以创建一个新类别和一个代表已经拥有的类别的块

在表单中我有一个选择框和4个foreach循环，它们遍历从父级到子级的类别

这是代码：

                    <select name="parentID" id="parentCategoryId">
                        <option value="null" selected>nothing</option>
                        @foreach (var Category in Model) {
                            if (Category.ParentID == null) {
                                <option value="@Category.ID">@Category.Name</option>
                                foreach (var SubCategory1 in Model) {
                                    if (SubCategory1.ParentID == Category.ID) {
                                        <option value="@SubCategory1.ID">
                                            &nbsp;&nbsp;&nbsp;
                                            »
                                            &nbsp;
                                            @SubCategory1.Name
                                        </option>
                                        foreach (var SubCategory2 in Model) {
                                            if (SubCategory2.ParentID == SubCategory1.ID) {
                                                <option value="@SubCategory2.ID">
                                                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                                                    »
                                                    &nbsp;
                                                    @SubCategory2.Name
                                                </option>
                                                foreach (var SubCategory3 in Model) {
                                                    if (SubCategory3.ParentID == SubCategory2.ID) {
                                                        <option value="@SubCategory3.ID">
                                                            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                                                            »
                                                            &nbsp;
                                                            @SubCategory3.Name
                                                        </option>
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    </select>

在视图中我从Model获取数据：

@model IEnumerable<project.Models.Category>

但我需要另一个Model对象用于：

@Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })

和验证操作！

问题是如何将这两种观点结合起来？现在我收到了这个错误：

Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.

抱歉我的英语口语！我知道这很糟糕

Answer 1

您需要创建模型：

public class CategoryModel {

      public string Name {get;set;}
      public string Address {get;set;}
      pubic string ParentId {get;set;}

      public IEnumerable<Category> Categories {get;set;}
}

在您的控制器中：

public ActionResult Categories() {
      var model = new CategoryModel();

      model.Categories = db.Categories.OrderBy(Categories => Categories.Name).ToList();

      return View(model);
}

[HttpPost]
public RedirectToRouteResult NewCategory(CategoryModel model) {
     if (ModelState.IsValid) {
             int? ParentID = null;

             if (model.ParentId != "null") {
                 ParentID = model.ParentId.AsInt();
             }

             Category oCategory = new Category();
             oCategory.Name = Model.Name;
             oCategory.Address = Model.Address;
             oCategory.ParentID = ParentID;
             db.Categories.Add(oCategory);
             db.SaveChanges();
             db.Dispose();
             db = null;
    }

    return RedirectToAction("Categories");
 }

并在视图中：

 @model project.Models.CategoryModel

现在您可以在同一视图中创建字段：

@Html.EditorFor(Model=>model.Title)
@Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })

在Asp.Net MVC 5中的一个视图中组合创建和索引视图

1 个答案: