Get all keys from Redis Cache in C#.NET

Today in this article, we shall see a simple approach of how to get all keys from Redis cache in the C#.NET application. In our last article, we learned an approach by using StackExchange.Redis provides a good interface to read or write from the Redis server instance.

However, it does not provide full access to the database.

Today we shall see the simple approach of using ConnectionMultiplexer to read the full database and perform read or delete of keys as needed.

Let’s push a few keys into the Redis cache,

>set 101 thecodebuzz101

>set 102 thecodebuzz102

I have written below a simple method that reads the cache and returns all available keys.

        public List<string> GetAllkeys()
        {
            List<string> listKeys = new List<string>();
            using (ConnectionMultiplexer redis = ConnectionMultiplexer.Connect("localhost:6379,allowAdmin=true"))
            {
                var keys = redis.GetServer("localhost", 6379).Keys();
                listKeys.AddRange(keys.Select(key => (string)key).ToList());

            }

            return listKeys;
        }

ConnectionMultiplexer Create a new ConnectionMultiplexer instance and obtain an interactive connection to a database inside Redis.

Best practices on using ConnectionMultiplexer

• ConnectionMultiplexer is thread-safe and support multi threading.

• Create an instance and try to reuse ConnectionMultiplexer object throughout process.

• Recommended to use ConnectionMultiplexer using dependency injection

The above example just explains a possible approach of using the ConnectionMultiplexer object for establishing the Redis connection.

However as explained above, please try to use dependency injection to manage the instances.

Please is another example using dependency injection,

public List<string> GetAllKeysinRedisCache()
        {
            List<string> listKeys = new List<string>();
            string host = _configuration.GetValue<string>("RedisCache:Host");
            string port = _configuration.GetValue<string>("RedisCache:Port");
            var iServer = _redisCache.GetServer(host, port);
            var keys = iServer.Keys();
            listKeys.AddRange(keys.Select(key => (string)key).ToList());
            return listKeys;
        }

Please refer to the below article for more details on how to create the above-mentioned _redisCache object using ConnectionMultiplexer

• Redis-Dependency Injection of ConnectionMultiplexer

References:

• Redis Distributed cache in .NET with examples

• Redis Cache Best Practices for Development

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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