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To reset/disable all items from IMemoryCache in ASP.NET Core, you can use the Clear() method. This method removes all entries from the cache.

For example, to clear the cache in an ASP.NET Core controller, you can inject the IMemoryCache service and call the Clear() method:

using Microsoft.Extensions.Caching.Memory;

public class MyController : Controller
{
    private readonly IMemoryCache _memoryCache;

    public MyController(IMemoryCache memoryCache)
    {
        _memoryCache = memoryCache;
    }

    public IActionResult ClearCache()
    {
        _memoryCache.Clear();
        return Ok("Cache cleared.");
    }
}

When the ClearCache() action method is called, it will clear all entries from the cache.