How can I convert from a Task<Generic.List<T>> to a Generic.IEnumerable<T>?-CodePudding

This is my parent component:

private IEnumerable<InventoryListDTO> InventorySelected { get; set; } = new List<InventoryListDTO>();

InventorySelected = _inventoryRepository.GetForList(inventorySelectDTO);

This is my implementation:

public async Task<List<InventoryListDTO>> GetForList(T_IFS_InventorySelectDTO InventorySelection)

And this is what is returned:

IEnumerable<InventoryListDTO> itemsMapped = _mapper.Map<IEnumerable<T_IFS_Inventory>, IEnumerable<InventoryListDTO>>(query);
{ async calls to modify data in itemsMapped }
return itemsMapped.ToList();

I need the implementation to be async. Maybe I am not using the correct types but the error I am getting is:

Cannot implicitly convert type 'System.Threading.Tasks.Task<System.Collections.Generic.List<ISInventory_Models.InventoryListDTO>>' to 'System.Collections.Generic.IEnumerable<ISInventory_Models.InventoryListDTO>'

I'm fine with returning an IEnumerable or a List but it must be async. I had this working until I tried to make it async and now I'm pretty confused. I have tried too many things to list but I can't quite get it right and I was hoping someone could assist. Please comment if you need additional information. Thanks in advance.

CodePudding user response：

You need to await the Task like this within the context of an async method. In your case probably OnInitializedAsync as it's in a component:

private IEnumerable<InventoryListDTO> InventorySelected = Enumerable.Empty<InventoryListDTO>();

protected async override Task OnInitializedAsync()
{
   InventorySelected = await _inventoryRepository.GetForList(inventorySelectDTO);
}

You can also assign an empty Enumerable on initialization rather that building out a List.