public async Task <IActionResult> Create([Bind("CategoryId,Title,Content,Keyword,Slug,CoverUrl,Status")] PostCategory category) { if (ModelState["Slug"].ValidationState == ModelValidationState.Invalid || string.IsNullOrEmpty(category.Slug)) { category.Slug = string.IsNullOrEmpty(category.Slug) ? Utils.GenerateSlug(category.Title) : category.Slug; ModelState.SetModelValue("Slug", new ValueProviderResult(category.Slug)); ModelState.Clear(); TryValidateModel(category); } if (await _postService.IsSlugCategoryExisted(category.Slug)) { ModelState.AddModelError(nameof(category.Slug), "Đường dẫn đã tồn tại"); } if (ModelState.IsValid) { await _postService.AddCategoryToDb(category); return(RedirectToAction(nameof(Index))); } var listcategory = await _postService.GetAllCategory(); listcategory.Insert(0, new PostCategory() { Title = "Không có danh mục cha", CategoryId = -1 }); return(View(category)); }