ConcurrentDictionary<TKey, TValue>.GetOrAdd Method (TKey, Func<TKey, TValue>)
Adds a key/value pair to the ConcurrentDictionary<TKey, TValue> by using the specified function, if the key does not already exist.
Assembly: mscorlib (in mscorlib.dll)
The key of the element to add.
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 for the key as returned by valueFactory if the key was not in the dictionary.
If you callsimultaneously on different threads, addValueFactory may be called multiple times, but its key/value pair might not be added to the dictionary for every call.
Available since 4.5
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 8.1