Thread::SetApartmentState Method (ApartmentState)
Sets the apartment state of a thread before it is started.
Assembly: mscorlib (in mscorlib.dll)
public: [HostProtectionAttribute(SecurityAction::LinkDemand, Synchronization = true, SelfAffectingThreading = true)] void SetApartmentState( ApartmentState state )
Parameters
- state
-
Type:
System.Threading::ApartmentState
The new apartment state.
| Exception | Condition |
|---|---|
| ArgumentException | state is not a valid apartment state. |
| ThreadStateException | The thread has already been started. |
| InvalidOperationException | The apartment state has already been initialized. |
New threads are initialized as ApartmentState::MTA if their apartment state has not been set before they are started. Apartment state must be set before a thread is started.
Note |
|---|
The main application thread is initialized to ApartmentState::MTA by default. The only way to set the apartment state of the main application thread to ApartmentState::STA is to apply the STAThreadAttribute attribute to the entry point method. |
The SetApartmentState method, along with the GetApartmentState method and the TrySetApartmentState method, replaces the ApartmentState property.
The following code example demonstrates the GetApartmentState, SetApartmentState, and TrySetApartmentState methods. The code example creates a thread. Before the thread is started, GetApartmentState displays the initial ApartmentState::Unknown state and SetApartmentState changes the state to ApartmentState::STA. The TrySetApartmentState method then returns false when attempting to change the state to ApartmentState::MTA because the apartment state is already set. If the same operation had been attempted with SetApartmentState, InvalidOperationException would have been thrown.
After the thread is started, the TrySetApartmentState method is used again. This time it throws ThreadStateException because the thread has already been started.
using namespace System; using namespace System::Threading; void ThreadProc() { Thread::Sleep(2000); }; void main() { Thread^ t = gcnew Thread(gcnew ThreadStart(ThreadProc)); Console::WriteLine("Before setting apartment state: {0}", t->GetApartmentState()); t->SetApartmentState(ApartmentState::STA); Console::WriteLine("After setting apartment state: {0}", t->GetApartmentState()); bool result = t->TrySetApartmentState(ApartmentState::MTA); Console::WriteLine("Try to change state: {0}", result); t->Start(); Thread::Sleep(500); try { t->TrySetApartmentState(ApartmentState::STA); } catch (ThreadStateException^) { Console::WriteLine("ThreadStateException occurs " + "if apartment state is set after starting thread."); } t->Join(); } /* This code example produces the following output: Before setting apartment state: Unknown After setting apartment state: STA Try to change state: False ThreadStateException occurs if apartment state is set after starting thread. */
Available since 2.0
