Question

我设计了一个ASP.NET Core Razor Pages应用程序，该应用程序实现了下拉列表类，并将该类用作Create，Read和Update类的基础。

现在，我想实现匿名身份验证，并且为此创建了另一个类，理想情况下，该类应该是Create，Read和Update类的基类。当我尝试添加它时，系统显示我不能使用2个基类。

如何在ASP.NET Core Razor（MVVM）中使用多个基类

我尝试同时使用两个类，但这引发了错误，指出我不能使用多个基类

我的下拉列表基类

public class GLRefPageModel: PageModel
    {
        public SelectList GLRefNameSL { get; set; }

        public void PopulateGLRefDropDownList(strMaterialsTransactContext _context, object selectedGLRef = null)
        {
            var GLRefsQuery = from d in _context.GLRef
                              select d;

            GLRefNameSL = new SelectList(GLRefsQuery.AsNoTracking(), "ID", "Description", selectedGLRef);

        }
    }

我的身份验证基类

public class DI_BasePageModel : PageModel
    {
        protected ApplicationDbContext Context { get; }
        protected IAuthorizationService AuthorizationService { get; }
        protected UserManager<IdentityUser> UserManager { get; }

        public DI_BasePageModel(
            ApplicationDbContext context,
            IAuthorizationService authorizationService,
            UserManager<IdentityUser> userManager) : base()
        {
            Context = context;
            UserManager = userManager;
            AuthorizationService = authorizationService;
        }
    }

我的编辑班

public class EditModel : GLRefPageModel
    {
        private readonly strMaterialsTransact.Models.strMaterialsTransactContext _context;

        public EditModel(strMaterialsTransact.Models.strMaterialsTransactContext context)
        {
            _context = context;
        }

        [BindProperty]
        public strMovement strMovement { get; set; }

        public async Task<IActionResult> OnGetAsync(int? id)
        {
            if (id == null)
            {
                return NotFound();
            }



            if (strMovement == null)
            {
                return NotFound();
            }
            //select the current GLRef
            PopulateGLRefDropDownList(_context, strMovement.GLRefID);
            return Page();
        }

        public async Task<IActionResult> OnPostAsync(int? id)
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }

            var strMovementToUpdate = await _context.strMovement.FindAsync(id);

            if (await TryUpdateModelAsync<strMovement>(
                strMovementToUpdate,
                "strmovement", //prefix for form value
                s => s.ID, s => s.TransactionDate, s => s.QtyFromStore, s => s.IDPartNbr,
                s => s.QtyToStore, s => s.GLRefID, s => s.ShopOrder, s => s.TransactionReason, s => s.TransactionReason,
                s => s.OwnerID, s => s.TimeLastAccessed, s => s.Initials, s => s.LastUser))
            {
                await _context.SaveChangesAsync();
                return RedirectToPage("./Index");
            }

            //**Select GLRef if TryUpdateModelAsync fails
            PopulateGLRefDropDownList(_context, strMovementToUpdate.GLRefID);
            return Page();
        }
    }

我希望我能够在创建，更新和读取操作中为下拉列表操作调用基类，并且能够为匿名身份验证练习调用（并使用）该类

Answer 1

我已经能够通过使用组成设计模式将所有类都转换为DI_BasePageModel类来解决该问题，如下所示：

public class DI_BasePageModel : PageModel
    {
        protected ApplicationDbContext Context { get; }
        protected IAuthorizationService AuthorizationService { get; }
        protected UserManager<IdentityUser> UserManager { get; }

        public DI_BasePageModel(
            ApplicationDbContext context,
            IAuthorizationService authorizationService,
            UserManager<IdentityUser> userManager) : base()
        {
            Context = context;
            UserManager = userManager;
            AuthorizationService = authorizationService;
        }


        public SelectList GLRefNameSL { get; set; }

        public void PopulateGLRefDropDownList(ApplicationDbContext _context,     object selectedGLRef = null)
        {
            var GLRefsQuery = from d in _context.GLRef
                              select d;

            GLRefNameSL = new SelectList(GLRefsQuery.AsNoTracking(), "GLRefID", "Description", selectedGLRef);

        }

感谢您指出克里斯·普拉特（Chris Pratt）

如何在ASP.NET Razor页面中对CRUD操作使用多个基类

1 个答案: