Initializes a new instance of the ConcurrentDictionary<TKey, TValue> class that is empty, has the default concurrency level and capacity, and uses the specified System.Collections.Generic.IEqualityComparer<T>.
The equality comparison implementation to use when comparing keys.
comparer is null.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.