如何在 Razor 页面中使用多个基类进行 CRUD 操作 ASP.NET

Question

我设计了一个 ASP.NET Core Razor Pages应用程序，实现下拉列表类，并将该类用作创建，读取和更新类的基础。

现在我想实现匿名身份验证，并为此创建了另一个类，理想情况下，它应该是创建、读取和更新类的基类。当我尝试添加它时，系统说我不能使用 2 个基类。

如何在核心剃刀 (MVVM( 中使用 ASP.NET 多个基类

我

尝试使用这两个类，但这触发了一个错误，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;
        }
    }

我的编辑类

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();
        }
    }

我希望我能够在我的创建、更新和读取操作中为我的下拉列表操作调用基类，并且还能够调用(和使用(该类进行匿名身份验证练习

Answer 1

我已经能够通过使用组合设计模式将所有类放入DI_BasePageModel类来解决问题，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·帕拉特