Compares the existing value for the specified key with a specified value, and if they’re equal,
updates the key with a third value.
Namespace:
System.Collections.Concurrent
Assembly:
System.Threading (in System.Threading.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Function TryUpdate ( _
key As TKey, _
newValue As TValue, _
comparisonValue As TValue _
) As Boolean |
| C# |
|---|
public bool TryUpdate(
TKey key,
TValue newValue,
TValue comparisonValue
) |
Parameters
- key
- Type: TKey
The key whose value is compared with comparisonValue and
possibly replaced.
- newValue
- Type: TValue
The value that replaces the value of the element with key if the comparison results in equality.
- comparisonValue
- Type: TValue
The value that is compared to the value of the element with
key.
Return Value
true if the value with
key was equal to
comparisonValue and replaced with
newValue; otherwise,
false.
Exceptions
| Exception | Condition |
|---|
| System..::.ArgumentNullException | key is a null
reference. |
See Also
