ASP.NET Core 6 - using memorycache in view component

Question

I am writing an application using ASP.NET Core 6 MVC.

I have a controller that instantiates an IMemoryCache and stores some values into the cache.

public HomeController(ILogger<HomeController> logger, IMemoryCache memoryCache)
{
    _logger = logger;
    _cache = memoryCache;
}

In some other part of the application I assign a value to the cache.

In the _Layout.cshtml I am using a view component

 @await Component.InvokeAsync("Menu")

I need to access the cache from the view component.

I set IMemoryCache in the constructor, and the try to get the data.

public class MenuViewComponent : ViewComponent
{
    private const string ClientInfoCacheKey = "ClientInfo";
    private  IMemoryCache _cache;

    public async Task<IViewComponentResult> InvokeAsync(IMemoryCache memoryCache)
    {
         _cache = memoryCache;
         var fromCache = _cache.Get<string>(ClientInfoCacheKey);
         // ......
    }
}

But the problem I am facing is that _cache is always null...

Is there a way to access cache from a view component?

Thanks

Dimitris Maragkos · Accepted Answer · 2022-09-28 19:53:55Z

1

You should inject IMemoryCache to your MenuViewComponent from constructor. Your code should be:

public class MenuViewComponent : ViewComponent
{
    private const string ClientInfoCacheKey = "ClientInfo";
    private readonly IMemoryCache _cache;

    public MenuViewComponent(IMemoryCache memoryCache)
    {
        _cache = memoryCache;
    }

    public async Task<IViewComponentResult> InvokeAsync()
    {         
         var fromCache = _cache.Get<string>(ClientInfoCacheKey);
         // ......
    }
}

edited Sep 28, 2022 at 19:53

answered Sep 28, 2022 at 19:48

Dimitris Maragkos

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