在MVC應用程序的局部視圖中訪問信息

Question

我正在編寫一個基於C＃的MVC Web應用程序，該應用程序顯示信息的類別和子類別。

因此，我為數據庫設置了一個與類別表相關的類別表，該類別表與自身相關，屬於子類別-所有這些都與Entity Framework掛鈎，並且運行良好。

我正在努力的是如何實現權限系統-我可以使用ViewBag輕松地做到這一點，但是我想知道這是否是“正確”的方法。

我有一個看起來像這樣的視圖：

@using Secure_Password_Repository.Utilities;
@using Secure_Password_Repository.Settings;
@using Secure_Password_Repository.ViewModels;
@model Secure_Password_Repository.ViewModels.CategoryDisplayItem

<ul id="roottree" class="treeview ui-accordion-content ui-helper-reset ui-widget-content ui-corner-bottom ui-accordion ui-widget ui-sortable ui-accordion-content-active">
    <li class="treeignore treeview ui-accordion ui-widget ui-helper-reset ui-sortable" data-id="0">
    <div><i class="glyphicon glyphicon-folder-open rightfolderpadding"></i>Root</div>
    <ul class="treeview ui-accordion-content ui-helper-reset ui-widget-content ui-corner-bottom ui-accordion ui-widget ui-sortable ui-accordion-content-active" id="parent-1">
        @foreach (var categoryitem in Model.categoryListItem.SubCategories)
        {
        @Html.Partial("_CategoryItem", categoryitem)
        }
        @if (Model.CanAddCategories)
        {
        @Html.Partial("_CreateCategory", Model.categoryAddItem)
        }
    </ul>
    </li>
</ul>

CategorDisplayItem模型如下所示：

public class CategoryDisplayItem
{
    public CategoryItem categoryListItem { get; set; }
    public CategoryAdd categoryAddItem { get; set; }
    public PasswordAdd passwordAddItem { get; set; }
    public bool CanAddCategories { get; set; }
    public bool CanEditCategories { get; set; }
}

public class CategoryItem : CategoryEdit
{
    [Required]
    public Int32 Category_ParentID { get; set; }
    public virtual ICollection<CategoryItem> SubCategories { get; set; }
    public virtual ICollection<PasswordItem> Passwords { get; set; }
    public bool CanEditCategory { get; set; }
    public bool CanDeleteCategory { get; set; }
}

public class CategoryEdit
{
    public Int32? CategoryId { get; set; }
    [Required]
    public string CategoryName { get; set; }
}

我遇到的問題是如何為CategoryItem視圖模型設置CanEditCategory和CanDeleteCategory屬性。 權限不是按類別設置的，而是全局設置的，即，如果我的帳戶具有編輯類別的權限，則它有權編輯所有類別。

CategoryItem模型是填充視圖實體框架：

        Category ReturnCategoryItem = DatabaseContext.Categories
                                        .Where(c => c.CategoryId == categoryid)
                                        .Include(c => c.SubCategories)
                                        .Include(c => c.Passwords)
                                        .Include(c => c.Passwords.Select(p => p.Creator))
                                        .ToList()
                                        .Select(c => new Category()
                                        {

                                            SubCategories = c.SubCategories
                                                                //make sure only undeleted subcategories are returned
                                                                .Where(sub => !sub.Deleted)
                                                                .OrderBy(sub => sub.CategoryOrder)
                                                                .ToList(),

                                            Passwords = c.Passwords
                                                                //make sure only undeleted passwords - that the current user has acccess to - are returned
                                                                .Where(pass => !pass.Deleted && PermissionService.CanViewPassword(pass)) 
                                                                .OrderBy(pass => pass.PasswordOrder)
                                                                .ToList(),

                                            CategoryId = c.CategoryId,
                                            CategoryName = c.CategoryName,
                                            Category_ParentID = c.Category_ParentID,
                                            CategoryOrder = c.CategoryOrder,
                                            Parent_Category = c.Parent_Category,
                                            Deleted = c.Deleted
                                        })
                                        .SingleOrDefault();

子類別“類別”列表將隱式轉換為“ CategoryItem”列表。 那么我將如何設置CanEditCategories和CanDeleteCategories屬性？

就像我說的，我可以只使用ViewBag ...，但是我讀到的所有內容都表明使用ViewBag是不好的。

Answer 1

如果這些是每個用戶唯一的屬性，則可以將這些屬性添加到您的Identity中，然后在視圖中像這樣使用它們：

在您的視圖cshtml文件的頂部：

@using Microsoft.AspNet.Identity

然后使用以下語法訪問您的用戶名：

@if (@User.Identity.CanAddCategories())
{
  @Html.Partial("_CreateCategory", Model.categoryAddItem)
}