StateMachineAttribute Class

July 28, 2014

Allows you to determine whether a method is a state machine method.

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

[AttributeUsageAttribute(AttributeTargets.Method, Inherited = false, AllowMultiple = false)]
public class StateMachineAttribute : Attribute

The StateMachineAttribute type exposes the following members.

Public methodStateMachineAttributeInitializes a new instance of the StateMachineAttribute class.

Public propertyStateMachineTypeReturns the type object for the underlying state machine type that was generated by the compiler to implement the state machine method.

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.)

You should not apply the StateMachine attribute to methods in your code. For methods that are state machine methods, the compiler will apply the AsyncStateMachineAttribute or IteratorStateMachineAttribute in the emitted IL.

When checking whether a method is a state machine method, it is preferable to instead check for following attributes, which are derived from StateMachineAttribute:


StateMachineAttribute cannot be used to check whether a method is a state machine method if the method is an iterator method in C#.

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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