ThreadStaticAttribute Class

July 28, 2014

Indicates that the value of a static field is unique for each thread.

System.Object
  System.Attribute
    System.ThreadStaticAttribute

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

'Declaration
<AttributeUsageAttribute(AttributeTargets.Field, Inherited := False)> _
Public Class ThreadStaticAttribute _
	Inherits Attribute

The ThreadStaticAttribute type exposes the following members.

  NameDescription
Public methodThreadStaticAttributeInitializes a new instance of the ThreadStaticAttribute class.
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  NameDescription
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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A static field (Shared in Visual Basic) marked with ThreadStaticAttribute is not shared between threads. Each executing thread has a separate instance of the field, and independently sets and gets values for that field. If the field is accessed on a different thread, it will contain a different value.

NoteNote:

Do not specify initial values for fields marked with ThreadStaticAttribute, because such initialization occurs only once, when the class constructor executes, and therefore affects only one thread. If you do not specify an initial value, you can rely on the field being initialized to its default value if it is a value type, or to Nothing (Nothing in Visual Basic) if it is a reference type.

Use this attribute as it is, and do not derive from it. The following is an example of ThreadStaticAttribute syntax:

<ThreadStatic> _
Shared value As Integer

Version Notes

Windows Phone

 ThreadStaticAttribute is not supported in Windows Phone.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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