ReadOnlyDictionary<TKey, TValue>::KeyCollection::ICollection<TKey>::Add Method (TKey)

 

Throws a NotSupportedException exception in all cases.

Namespace:   System.Collections.ObjectModel
Assembly:  mscorlib (in mscorlib.dll)

private:
virtual void Add(
	TKey item
) sealed = ICollection<TKey>::Add

Parameters

item
Type: TKey

The object to add to the collection.

Exception Condition
NotSupportedException

In all cases.

This member is an explicit interface member implementation. It can be used only when the ReadOnlyDictionary<TKey, TValue>::KeyCollection instance is cast to an ICollection<T> interface. The ICollection<T> interface specifies that the Add method should throw a NotSupportedException exception if the collection that implements the interface is read-only.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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