ReadOnlyDictionary(Of TKey, TValue).KeyCollection.ICollection(Of TKey).Add Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Throws a NotSupportedException exception in all cases.
Assembly: mscorlib (in mscorlib.dll)
| Exception | Condition |
|---|---|
| NotSupportedException | In all cases. |
This member is an explicit interface member implementation. It can be used only when the ReadOnlyDictionary(Of TKey, TValue).KeyCollection instance is cast to an ICollection(Of T) interface. The ICollection(Of T) interface specifies that the Add method should throw a NotSupportedException exception if the collection that implements the interface is read-only.