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ConcurrentDictionary<TKey, TValue>::TryUpdate Method

Compares the existing value for the specified key with a specified value, and if they are equal, updates the key with a third value.

Namespace:  System.Collections.Concurrent
Assembly:  mscorlib (in mscorlib.dll)
bool TryUpdate(
	TKey key, 
	TValue newValue, 
	TValue comparisonValue


Type: TKey

The key whose value is compared with comparisonValue and possibly replaced.

Type: TValue

The value that replaces the value of the element that has the specified key if the comparison results in equality.

Type: TValue

The value that is compared to the value of the element that has the specified key.

Return Value

Type: System::Boolean
true if the value with key was equal to comparisonValue and was replaced with newValue; otherwise, false.

key is nullptr.

The following example shows how to call the TryUpdate method:

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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