1. FlushAll() Clear Cache
mClient.Store(StoreMode.Set, "key1", 1234L);
Console.Write(mClient.Get("key1")); // Retrieve 1234 normally
mClient.FlushAll();
Console.Write(mClient.Get("key1")); // Output nullCode language: JavaScript (javascript)Key Notes
FlushAll(): Wipes all keys on the Memcached server‑handle with great care!
- Never invoke this in production; it erases all business‑related cache entries.
- It invalidates existing records without freeing memory (Memcached lazy eviction).
2. TryGet Safe Cache Retrieval
object obj = null;
var isSuc = mClient.TryGet("key1", out obj );
// Key exists: isSuc=true, obj =1234
isSuc = mClient.TryGet("key1", out obj );
// Key missing: isSuc=false, obj remains nullCode language: JavaScript (javascript)Get() vs TryGet()
| Method | Characteristics | Use‑case |
|---|---|---|
mClient.Get(key) | Returns null for missing keys; cannot tell apart a null‑valued cache entry from a non‑existent key | Basic read operations where key existence does not matter |
mClient.TryGet(key, out obj) | Boolean return value indicates key presence; distinguishes two kinds of null scenarios precisely | Recommended for logic requiring cache‑hit detection |
Generic overload is available: mClient.TryGet<T>(key, out T value)
Important Remarks
FlushAll()is a server‑side command. Under cluster setup it purges data across every node by default;- Memcached offers no persistence. All data vanishes once the service restarts;
- Prefer
TryGetfor cache‑penetration guard checks to prevent flood of database queries.
Other Operations
Previous: Object Persistence