MemoryCache.Contains(String, String) Method

Definition

Determines whether a cache entry exists in the cache.

C#
public override bool Contains(string key, string regionName = default);

Parameters

key
String

A unique identifier for the cache entry to search for.

regionName
String

A named region in the cache to which a cache entry was added. Do not pass a value for this parameter. This parameter is null by default, because the MemoryCache class does not implement regions.

Returns

true if the cache contains a cache entry whose key matches key; otherwise, false.

Exceptions

key is null.

regionName is not null.

Applies to

Product Versions
.NET 8 (package-provided), 9 (package-provided)
.NET Framework 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7 (package-provided), 4.7, 4.7.1 (package-provided), 4.7.1, 4.7.2 (package-provided), 4.7.2, 4.8 (package-provided), 4.8, 4.8.1
.NET Standard 2.0 (package-provided)