ConcurrentDictionary<TKey, TValue>.GetOrAdd Method (TKey, TValue)
Adds a key/value pair to the ConcurrentDictionary<TKey, TValue> if the key does not already exist.
Assembly: mscorlib (in mscorlib.dll)
The key of the element to add.
the value to be added, if the key does not already exist
Return ValueType: TValue
The value for the key. This will be either the existing value for the key if the key is already in the dictionary, or the new value if the key was not in the dictionary.
Available since 8
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 8.1