How to call an action method from a viewComponent class in ASP.NET Core 3.1 - MVC?

Question

User-158191824 posted

I need to bind a Model to my Layout.cshtml so this is what I have done and it is working truly :

My ViewComponent Class is created in a folder named ViewComponents in my main project:

public class ItemsTitleViewComponent : ViewComponent
{

    private readonly IUnitOfWork _unitOfWork;
    public ItemsTitleViewComponent(IUnitOfWork unitOfWork)
    {
        _unitOfWork = unitOfWork;
    }

    public async Task<IViewComponentResult> InvokeAsync()
    {
        IEnumerable<ItemsGroup> items = await _unitOfWork.itemsRepository.GetAll(includeProperties: "category");
        return View(itemsGroups);
    }
}

The view related to my viewComponent is created in a folder as below:

Views>Shared>Components>ItemsTitle>Default.cshtml

and my Default.cshtml is something like :

@model IEnumerable<Project.Models.Items>
// Something to get from data base and show ..

And in my Layout page or any *.cshtml that I want to use that view component :

@await Component.InvokeAsync("ItemsTitle");

Everything seems good but I do not know if using unitofwork injection in viewComponent class is true or not ! So I desided to call my Index action method in itemscontroller in Admin area to omit unitofwork from viewComponent class.

So I need the view component class to be simplified to something like this but I can not manage it:

 public class ItemsTitleViewComponent : ViewComponent
{       
    public async Task<IViewComponentResult> InvokeAsync()
    {           
        IEnumerable<Items> items = ?? resultOfAction("mycontroller","myActionMethod","new {Area = "Admin"});
        return View(items);
    }
}

I do not know if it is possible or not to take the results of an action method in a view-component class and pass it to the related View().

Thanks

Answer 1

User1312693872 posted

Hi,ehsan_kabiri_33

I do not know if it is possible or not to take the results of an action method in a view-component class and pass it to the related View().

If you want to get data from another action, I suggest you use TempData, following is a little demo:

Component.cs:

public async Task<IViewComponentResult> InvokeAsync()
        {
            var items = TempData["MyModel"];
                return View("Default", items);
        }

Controller:

public IActionResult Index()
        {
            TempData["MyModel"] = db.MyModels.ToList();   //modify it according to your needs
            return View();
        }

Best Regards,

Jerry Cai