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LazyInitializer.EnsureInitialized<T> Method (T, Func<T>)

Initializes a target reference type by using a specified function if it hasn't already been initialized.

Namespace:  System.Threading
Assemblies:   System.Threading (in System.Threading.dll)
  mscorlib (in mscorlib.dll)

public static T EnsureInitialized<T>(
	ref T target,
	Func<T> valueFactory
where T : class

Type Parameters


The reference type of the reference to be initialized.


Type: T

The reference of type T to initialize if it hasn't already been initialized.

Type: System.Func<T>

The function that is called to initialize the reference.

Return Value

Type: T
The initialized value of type T.


Type T does not have a default constructor.


valueFactory returned null (Nothing in Visual Basic).

This method may only be used on reference types, and valueFactory may not return a null reference (Nothing in Visual Basic). To ensure initialization of value types or to allow null reference types, see other overloads of EnsureInitialized.

This method may be used concurrently by multiple threads to initialize target.

In the event that multiple threads access this method concurrently, multiple instances of T may be created, but only one will be stored into target. In such an occurrence, this method will not dispose of the objects that were not stored. If such objects must be disposed, it is up to the caller to determine if an object was not used and to then dispose of the object appropriately.

.NET Framework

Supported in: 4.6, 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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

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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