Getting all cache keys Microsoft.Extensions.Caching.Memory

[KamranShahid]

Is there anything available at this time for getting list of keys?

[KamranShahid]

Using Following workaround at the moment. I am using .net core 3.1

 private static List<string> GetAllKeysList()
        {
            var field = typeof(MemoryCache).GetProperty("EntriesCollection", BindingFlags.NonPublic | BindingFlags.Instance);
            var collection = field.GetValue(Cache) as ICollection;
            var items = new List<string>();
            if (collection != null)
                foreach (var item in collection)
                {
                    var methodInfo = item.GetType().GetProperty("Key");
                    var val = methodInfo.GetValue(item);
                    items.Add(val.ToString());
                }
            return items;
        }

[jodydonetti]

If you really, really, really have to do something like this, at least move the var methodInfo = item.GetType().GetProperty("Key"); part out of the foreach loop to avoid a double reflection lookup per each item.

Btw maybe this is what you are looking for.

[KamranShahid]

I don't answer If you really, really, really have to do something like this, at least move the var methodInfo = item.GetType().GetProperty("Key"); part out of the foreach loop to avoid a double reflection lookup per each item.

Btw maybe this is what you are looking for.

I know about option in System.Runtime.Cache. where i get the list of all keys like
var cacheKeys = MemoryCache.Default.Select(kvp => kvp.Key).ToList();
Here i am looking for the list of all keys in Microsoft.Extensions.Caching.Memory

I have got the above option from
https://stackoverflow.com/questions/45597057/how-to-retrieve-a-list-of-memory-cache-keys-in-asp-net-core

[analogrelay]

This isn't something that's currently supported, it would require an API change to the IMemoryCache interface. What's the scenario where you find you need to list cache keys? In general, we don't want to force all caching implementations to provide a way to list keys since it can be costly to implement and leaks some of the abstraction we're trying to provide.

[KamranShahid]

This isn't something that's currently supported, it would require an API change to the IMemoryCache interface. What's the scenario where you find you need to list cache keys? In general, we don't want to force all caching implementations to provide a way to list keys since it can be costly to implement and leaks some of the abstraction we're trying to provide.

i have an old implementation of object caching which i have migrated in .net core.
In some methods i am in listing all keys then removing the keys which are starts with certain input string.
secondly i am clearing all caching keys on some specific condition.

[Dotnet-GitSync-Bot]

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[specialforest]

+1, .net has two(!) implementations of MemoryCache and both are terrible!

[maryamariyan]

Thanks @KamranShahid for your issue. The next step for this would be to add API proposal, and example usage. Refer to https://github.com/dotnet/runtime/blob/master/docs/project/api-review-process.md for more detail.

[KamranShahid]

If you really, really, really have to do something like this, at least move the var methodInfo = item.GetType().GetProperty("Key"); part out of the foreach loop to avoid a double reflection lookup per each item.

Btw maybe this is what you are looking for.

Can you suggest how?

[sigmarsson]

I too display interest in dealing somehow with the keys.
My key is like $"{object}+{DateTime}-{DateTime}"

Therefore my cache legitim could furnish the cached value for the following key request :

$"{object}+{DateTime + 1 Day}-{DateTime - 1 Day}" because this period is contained by the previous one.

I am not sure anymore this class is the right one here. What is your take on ?

[adamsitnik]

@KamranShahid As @maryamariyan has pointed (#36026 (comment)), you need to provide the API proposal using the official template. Once you do that and we have a better understanding of what problem the API would try to solve, we can continue the process of adding new API.

[ghost]

This issue has been automatically marked no recent activity because it has been marked as needs author feedback but has not had any activity for 14 days. It will be closed if no further activity occurs within 7 more days. Any new comment (by anyone, not necessarily the author) will remove no recent activity

[KamranShahid]

@KamranShahid As @maryamariyan has pointed (#36026 (comment)), you need to provide the API proposal using the official template. Once you do that and we have a better understanding of what problem the API would try to solve, we can continue the process of adding new API.

requirement is quite clear and i have put a solution as well which i am using

[maryamariyan]

I don't see us working on this feature item anytime soon, closing since it does not seem like a blocking item either.