ReadOnlyDictionary<TKey, TValue>.KeyCollection.ICollection<TKey>.Add Method

.NET Framework (current version)

Throws a NotSupportedException exception in all cases.

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

void ICollection<TKey>.Add(
	TKey item
)

Parameters

item
Type: TKey

The object to add to the collection.

Implements

ICollection<T>.Add(T)

ExceptionCondition
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.

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
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