MTAThreadAttribute Class

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

ThreadAttributes.cs

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

public ref class MTAThreadAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Method)]
public sealed class MTAThreadAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Method)>]
type MTAThreadAttribute = class
    inherit Attribute

Public NotInheritable Class MTAThreadAttribute
Inherits Attribute

Inheritance

Object

Attribute

MTAThreadAttribute

Attributes

AttributeUsageAttribute

Remarks

Apply this attribute to the entry point method (the Main() method in C# and Visual Basic). It has no effect on other methods. To set the apartment state of threads you start in your code, use the Thread.SetApartmentState or Thread.TrySetApartmentState method before starting the thread.

Note

For an overview of COM threading models, see Understanding and Using COM Threading Models.

COM threading models only apply to applications that use COM interop. 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, and the MTAThreadAttribute attribute, if it is present, has no effect.

Starting with the .NET Framework version 2.0, the default threading model for COM interop depends on the language in which you are developing your application, as the following table shows.

Language	COM apartment model
C#	Multithreaded apartment
C++	Multithreaded apartment
Visual Basic	Single-threaded apartment

To change these defaults, you use the MTAThreadAttribute attribute to set the threading model for the application, or call the Thread.SetApartmentState or Thread.TrySetApartmentState method before starting the thread to set the threading model for a particular thread. In C++, you can also use the /CLRTHREADATTRIBUTE (Set CLR Thread Attribute) linker option to specify the apartment model.

Some of the cases in which you want to use the MTAThreadAttribute attribute to explicitly set the threading model to multithreaded apartment include the following:

• You're developing a Visual Basic app that calls to a C# library that in turn relies on COM interop. Because the multithreaded apartment model is the default for C#, you should change your app's threading model to multithreaded by using the MTAThreadAttribute attribute.

• Your application makes calls to COM components that use the multithreaded apartment model.

Constructors

MTAThreadAttribute()

Initializes a new instance of the MTAThreadAttribute class.

Properties

TypeId

When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
GetHashCode()	Returns the hash code for this instance. (Inherited from Attribute)
GetType()	Gets the Type of the current instance. (Inherited from Object)
IsDefaultAttribute()	When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute)
Match(Object)	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

See also

• STAThreadAttribute