Getting Data from Memcached in C# (Detailed Guide w/ Code Examples)
Use Case(s)
The get
operation in Memcached is useful when you want to retrieve a value associated with a particular key from the cache. This is commonly used in scenarios such as:
- Retrieving session data for a logged-in user.
- Fetching cached query results to improve performance.
Code Examples
You can use EnyimMemcached, a popular .NET client for Memcached. If it's not installed, you can add it using NuGet Package Manager.
Here's how you can retrieve a value from Memcached:
CODE_BLOCK_PLACEHOLDER_0
In this example, we create a MemcachedClient
object and use its Get
method to fetch the object associated with "user:123"
. If an object with that key exists in the cache, it will be returned; otherwise, null
is returned.
Best Practices
- Always check if the returned value is
null
. This means there's no item with such a key in the cache. - Avoid storing sensitive information in the cache unless necessary as it is not secure storage.
Common Mistakes
- Assuming that a cached value will always be available. Items in Memcached are evicted when memory runs low, using a Least Recently Used (LRU) strategy.
- Serializing complex objects to store in the cache, when only a small part of these objects is needed. This can cause unnecessary load on both the network and Memcached.
FAQs
Q: What happens if the key does not exist in the cache?
A: The method will return null
.
Q: Can I store complex objects (like lists or dictionaries) in Memcached?
A: Yes, Memcached can store any kind of object, but remember that they must be serializable and deserializable.
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