CollectionExtensionsAddOrUpdateTKey, TValue(IDictionaryTKey, TValue, TKey, FuncTKey, TValue, FuncTKey, TValue, TValue) Method

public static TValue AddOrUpdate<TKey, TValue>(
	this IDictionary<TKey, TValue> dictionary,
	TKey key,
	Func<TKey, TValue> addValueFactory,
	Func<TKey, TValue, TValue> updateValueFactory
)

<ExtensionAttribute>
Public Shared Function AddOrUpdate(Of TKey, TValue) ( 
	dictionary As IDictionary(Of TKey, TValue),
	key As TKey,
	addValueFactory As Func(Of TKey, TValue),
	updateValueFactory As Func(Of TKey, TValue, TValue)
) As TValue

public:
[ExtensionAttribute]
generic<typename TKey, typename TValue>
static TValue AddOrUpdate(
	IDictionary<TKey, TValue>^ dictionary, 
	TKey key, 
	Func<TKey, TValue>^ addValueFactory, 
	Func<TKey, TValue, TValue>^ updateValueFactory
)

JavaScript does not support generic types or methods.

Parameters

dictionary  IDictionaryTKey, TValue

The dictionary to add the key/value pair to if the key does not already exist.

key  TKey

The key to be added or whose value should be updated

addValueFactory  FuncTKey, TValue

The function used to generate a value for an absent key

updateValueFactory  FuncTKey, TValue, TValue

The function used to generate a new value for an existing key based on the key's existing value

Type Parameters

TKey

The type of the keys in the dictionary.

TValue

The type of the values in the dictionary.

Return Value

Usage Note

Reference