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ApartmentAspect for PostSharp.
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namespace ArkaneSystems.Arkane.Aspects | |
{ | |
/// <summary> | |
/// An aspect to execute a function on a thread in the given COM apartment state. | |
/// </summary> | |
[Serializable] | |
public sealed class ApartmentAspect : MethodInterceptionAspect | |
{ | |
private readonly ApartmentState desiredState; | |
private Exception returnException; | |
/// <summary> | |
/// An aspect to execute a function on a thread in the given COM apartment state. | |
/// </summary> | |
/// <param name="state">The desired COM apartment state (default STA).</param> | |
public ApartmentAspect (ApartmentState state = ApartmentState.STA) | |
{ | |
this.desiredState = state; | |
} | |
/// <summary> | |
/// Method invoked <i>instead</i> of the method to which the aspect has been applied. | |
/// </summary> | |
/// <param name="args">Advice arguments.</param> | |
public override void OnInvoke (MethodInterceptionArgs args) | |
{ | |
// Obtain current thread's apartment state. | |
ApartmentState currentState = Thread.CurrentThread.GetApartmentState (); | |
if (currentState == this.desiredState) | |
{ | |
// If the current state is the desired state, just proceed. | |
args.Proceed (); | |
} | |
else | |
{ | |
this.returnException = null; | |
// Spawn new thread to run args.Proceed, putting it in the desired apartment state. | |
var aptThread = new Thread (() => this.ProceedOnOtherThread (args)); | |
aptThread.SetApartmentState (this.desiredState); | |
// Run it and block until it is complete. | |
aptThread.Start (); | |
aptThread.Join (); | |
// Marshal exceptions back to this thread. | |
if (this.returnException != null) | |
throw new CrossThreadException (this.returnException); | |
} | |
} | |
private void ProceedOnOtherThread (MethodInterceptionArgs args) | |
{ | |
try | |
{ | |
args.Proceed (); | |
} | |
catch (Exception ex) | |
{ | |
this.returnException = ex; | |
} | |
} | |
} | |
} |
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