CategoryVM:::::

public class CategoryVM { public Category Category { get; set; } = new Category();

    public IEnumerable<Category> Categories { get; set; } = new List<Category>();
}

CategoryController::::

private IUnitOfWork _unitOfWork; public CategoryController(IUnitOfWork unitOfWork) { _unitOfWork = unitOfWork; }

    public IActionResult Index()
    {
        CategoryVM categoryVM = new CategoryVM();
        categoryVM.Categories = _unitOfWork.Category.GetAll();
        return View(categoryVM);
    }

the code was working fine before adding viewmodel but after adding this I gonna face viewmodel error like:::

An unhandled exception occurred while processing the request. InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'ModelLibrary.ViewModel.CategoryVM', but this ViewDataDictionary instance requires a model item of type 'System.Collections.Generic.IEnumerable`1[ModelLibrary.Models.Category]'.

CodePudding user response：

you have to fix an Index view model, instead of Category should be

@model CategoryVM 

.... fix the html data binding accordingly

or if you don't use a Category in your view, you can change model

@model List<Category>

.... fix the html data binding accordingly

but in this case you will have to change the action code too

 var model = _unitOfWork.Category.GetAll();
  return View(model)

CodePudding user response：

Everything is correct you just need to :

@model IEnumerable<ModelLibrary.Models.Category>

Replace by given blew code because we already made list in ViewModel and upper code is also printing list that's because exception hendling error appearing::

@model ModelLibrary.ViewModel.CategoryVM