protected virtual void SetItem(
	TKey key,
	TValue value,
	TValue oldValue
)

Parameters

key

Type: TKey
The key of the element to add or replace.

value

Type: TValue
The new value to assign to the key.

oldValue

Type: TValue
The old value assigned to key, or null if there is currently no value assigned to key.

There is redundancy in requiring both key and oldValue, but this redundancy is required for performance reason.

Note
This method does not cause the advices to be executed. It should be invoked only from inside the scope of the ExecuteWithAdvices<TResult, TAction>(ObjectAccessLevel, TAction) method.

Reference