Unable to cast object of type 'EFSecondLevelCache.Core.Contracts.EFCacheKey' to type **

[fishen]

I used redis for cahce provider in my app, when the first time to fetch data from db, it will return a empty result and cache the result to the redis, but i found the cached data is incorrent, the cached value is '{"CacheDependencies": []}' and the value type is 'EFSecondLevelCache.Core.Contracts.EFCacheKey, EFSecondLevelCache.Core, Version=1.0.3.0, Culture=neutral, PublicKeyToken=null' , so it willl throw a castexception when attemp read again.

Code: var entity=context.Set<ProductCategorie>().Where(m=>!m.Deleted).Cacheable().FirstOrDefault();

Error: System.InvalidCastException:“Unable to cast object of type 'EFSecondLevelCache.Core.Contracts.EFCacheKey' to type 'Jazea.Chain.Domain.Entity.ProductCategorie'.”

[fishen]

It works when use ToList() or Count().

public static void AddCache(IServiceCollection services)
{
    var provider = services.BuildServiceProvider();
    var config = provider.GetService<IConfigurationRoot>();
    var redisConnStr = config.GetValue<string>("RedisConnetionString");
    services.AddEFSecondLevelCache();
    services.AddSingleton(typeof(ICacheManager<>), typeof(BaseCacheManager<>));
    var jss = new JsonSerializerSettings()
    {
        NullValueHandling = NullValueHandling.Ignore,
        ReferenceLoopHandling = ReferenceLoopHandling.Ignore
    };
    services.AddSingleton<ICacheManagerConfiguration>(
        new CacheManager.Core.ConfigurationBuilder()
            .WithJsonSerializer(jss, jss)
            .WithRedisConfiguration("Redis", redisConnStr)
            .WithRedisCacheHandle("Redis")
            .WithExpiration(ExpirationMode.None, TimeSpan.FromHours(1))
            .Build()
    );
}

public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
{
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();
    app.UseEFSecondLevelCache();
    app.Map("/api", c => c.UseMvc());
}

[fishen]

[fishen]

Because i set NullValueHandling = NullValueHandling.Ignore, so the cached value is incomplete. The complate info is :

{
  "Key": null,
  "KeyHash": null,
  "CacheDependencies": []
}

It will throw InvalidCastException while reading the cahed value .

[VahidN]

• Please update your NuGet packages (all of them). You are not using the latest versions.
• I can't reproduce your issue. I added Redis related settings and services. I can run both unit tests and also the sample web app with the same FirstOrDefault method:

• The whole purpose of using the CacheManager as the infrastructure is to do not fighting with all of the available cache providers. EFSecondLevelCache.Core doesn't know anything about Redis or .... It just uses the public API of the CacheManager to insert/update/get info.

[VahidN]

It's fixed via https://github.com/VahidN/EFSecondLevelCache.Core/commit/15839e39b10ef581139fe558a64d0adf85a8c074 (Improved null object detection).

PM> update-package

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