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Lazy<T> Constructor (Func<T>)

.NET Framework 4

Updated: March 2011

Initializes a new instance of the Lazy<T> class. When lazy initialization occurs, the specified initialization function is used.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

C++

Copy

public Lazy(
	Func<T> valueFactory
)

Parameters

valueFactory: Type: System.Func<T>
The delegate that is invoked to produce the lazily initialized value when it is needed.

Exceptions

Exception	Condition
ArgumentNullException	valueFactory is null.

Remarks

An instance that is created with this constructor may be used concurrently from multiple threads.

The thread safety mode of a Lazy<T> instance that is initialized with this constructor is LazyThreadSafetyMode.ExecutionAndPublication. The thread safety mode describes the behavior when multiple threads try to initialize the Lazy<T> instance.

Exceptions that are thrown by valueFactory are cached. For more information, see the System.Threading.LazyThreadSafetyMode enumeration.

Version Information

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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