public void Main()
{
IMemoryCache cache = new MemoryCache(new MemoryCacheOptions());
object result;
string key = "Key";
object newObject = new object();
object state = new object();
// Basic CRUD operations:
// Create / Overwrite
result = cache.Set(key, newObject);
result = cache.Set(key, new object());
// Retrieve, null if not found
result = cache.Get(key);
// Retrieve
bool found = cache.TryGetValue(key, out result);
// Delete
cache.Remove(key);
// Cache entry configuration:
// Stays in the cache as long as possible
result = cache.Set(
key,
new object(),
new MemoryCacheEntryOptions().SetPriority(CacheItemPriority.NeverRemove));
// Automatically remove if not accessed in the given time
result = cache.Set(
key,
new object(),
new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromMinutes(5)));
// Automatically remove at a certain time
result = cache.Set(
key,
new object(),
new MemoryCacheEntryOptions().SetAbsoluteExpiration(DateTimeOffset.UtcNow.AddDays(2)));
// Automatically remove at a certain time, which is relative to UTC now
result = cache.Set(
key,
new object(),
new MemoryCacheEntryOptions().SetAbsoluteExpiration(relative: TimeSpan.FromMinutes(10)));
// Automatically remove if not accessed in the given time
// Automatically remove at a certain time (if it lives that long)
result = cache.Set(
key,
new object(),
new MemoryCacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromMinutes(5))
.SetAbsoluteExpiration(DateTimeOffset.UtcNow.AddDays(2)));
// Callback when evicted
var options = new MemoryCacheEntryOptions()
.RegisterPostEvictionCallback(
(echoKey, value, reason, substate) =>
{
Console.WriteLine(echoKey + ": '" + value + "' was evicted due to " + reason);
});
result = cache.Set(key, new object(), options);
// Remove on token expiration
var cts = new CancellationTokenSource();
options = new MemoryCacheEntryOptions()
.AddExpirationToken(new CancellationChangeToken(cts.Token))
.RegisterPostEvictionCallback(
(echoKey, value, reason, substate) =>
{
Console.WriteLine(echoKey + ": '" + value + "' was evicted due to " + reason);
});
result = cache.Set(key, new object(), options);
// Fire the token to see the registered callback being invoked
cts.Cancel();
// Expire an entry if the dependent entry expires
using (var link = cache.CreateLinkingScope())
{
cts = new CancellationTokenSource();
cache.Set("key1", "value1", new MemoryCacheEntryOptions()
.AddExpirationToken(new CancellationChangeToken(cts.Token)));
// expire this entry if the entry with key "key1" expires.
cache.Set("key2", "value2", new MemoryCacheEntryOptions()
.AddEntryLink(link)
.RegisterPostEvictionCallback(
(echoKey, value, reason, substate) =>
{
Console.WriteLine(echoKey + ": '" + value + "' was evicted due to " + reason);
}));
}
// Fire the token to see the registered callback being invoked
cts.Cancel();
}
