MTAThreadAttribute Class
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MTAThreadAttribute Class

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Indicates that the COM threading model for an application is multithreaded apartment (MTA).


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

public sealed class MTAThreadAttribute : Attribute

The MTAThreadAttribute type exposes the following members.

Public methodMTAThreadAttributeInitializes a new instance of the MTAThreadAttribute class.

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.)


Apply this attribute to the entry point method (the Main() method in C# and Visual Basic). It has no effect on other methods.

COM threading models only pertain to applications that use COM interop. Using this attribute in an application that does not use COM interop has no effect.

The COM threading model can be set to single-threaded apartment or multithreaded apartment. The application thread is only initialized for COM interop if the thread actually makes a call to a COM component. If COM interop is not used, then the thread is not initialized.

Windows Phone OS

Supported in: 8.1, 8.0

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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