Thread.TrySetApartmentState(ApartmentState) Thread.TrySetApartmentState(ApartmentState) Thread.TrySetApartmentState(ApartmentState) Thread.TrySetApartmentState(ApartmentState) Method

Определение

Задает модель "apartment" для потока до его запуска.Sets the apartment state of a thread before it is started.

public:
 bool TrySetApartmentState(System::Threading::ApartmentState state);
public bool TrySetApartmentState (System.Threading.ApartmentState state);
member this.TrySetApartmentState : System.Threading.ApartmentState -> bool
Public Function TrySetApartmentState (state As ApartmentState) As Boolean

Параметры

state
ApartmentState ApartmentState ApartmentState ApartmentState

Новая модель "apartment".The new apartment state.

Возвраты

Значение true, если задана модель "apartment"; в противном случае — значение false.true if the apartment state is set; otherwise, false.

Исключения

Только в .NET Core: этот элемент не поддерживается на платформах Linux и macOS..NET Core only: This member is not supported on the macOS and Linux platforms.

state не является допустимым состоянием подразделения.state is not a valid apartment state.

Поток был запущен, а затем завершен, либо вызов выполняется не из контекста потока во время выполнения потока.The thread was started and has terminated, or the call is not being made from the thread's context while the thread is running.

Примеры

В следующем примере кода демонстрируются методы GetApartmentState, SetApartmentState и TrySetApartmentState.The following code example demonstrates the GetApartmentState, SetApartmentState, and TrySetApartmentState methods. В примере кода создается поток.The code example creates a thread. Перед началом потока GetApartmentState отображает начальное состояние ApartmentState.Unknown, а SetApartmentState меняет состояние на ApartmentState.STA.Before the thread is started, GetApartmentState displays the initial ApartmentState.Unknown state and SetApartmentState changes the state to ApartmentState.STA. Затем метод TrySetApartmentState возвращает false при попытке изменить состояние на ApartmentState.MTA, так как состояние апартамента уже задано.The TrySetApartmentState method then returns false when attempting to change the state to ApartmentState.MTA because the apartment state is already set. Если была предпринята попытка выполнения одной операции с SetApartmentState, будет выдано исключение InvalidOperationException.If the same operation had been attempted with SetApartmentState, InvalidOperationException would have been thrown.

После запуска потока снова используется метод TrySetApartmentState.After the thread is started, the TrySetApartmentState method is used again. В этот раз возникает исключение ThreadStateException, так как поток уже запущен.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.
 */
using System;
using System.Threading;

class Example
{
    public static void Main()
    {
        Thread t = new Thread(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();
    }

    public static void ThreadProc()
    {
        Thread.Sleep(2000);
    }
}

/* 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.
 */
Imports System.Threading

Module Example

    Sub Main()
 
        Dim t As New Thread(AddressOf ThreadProc)
        Console.WriteLine("Before setting apartment state: {0}", _
            t.GetApartmentState())

        t.SetApartmentState(ApartmentState.STA)
        Console.WriteLine("After setting apartment state: {0}", _
            t.GetApartmentState())

        Dim result As Boolean = _
            t.TrySetApartmentState(ApartmentState.MTA)
        Console.WriteLine("Try to change state: {0}", result)

        t.Start()

        Thread.Sleep(500)

        Try
            t.TrySetApartmentState(ApartmentState.STA)
        Catch ex As ThreadStateException
            Console.WriteLine("ThreadStateException occurs " & _
                "if apartment state is set after starting thread.")
        End Try

        t.Join()
    End Sub

    Sub ThreadProc()
        Thread.Sleep(2000)
    End Sub
End Module

' 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.

Комментарии

Новые потоки инициализируются как ApartmentState.MTA, если их состояние апартамента не было задано до запуска.New threads are initialized as ApartmentState.MTA if their apartment state has not been set before they are started. Перед запуском потока необходимо задать состояние апартамента.Apartment state must be set before a thread is started.

Примечание

Основной поток приложения инициализируется значением по умолчанию ApartmentState.MTA.The main application thread is initialized to ApartmentState.MTA by default. Единственный способ задать для состояния подразделения основного потока приложения значение ApartmentState.STA — применить атрибут STAThreadAttribute к методу точки входа.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.

Метод TrySetApartmentState вместе с методом GetApartmentState и методом SetApartmentState заменяет свойство ApartmentState.The TrySetApartmentState method, along with the GetApartmentState method and the SetApartmentState method, replaces the ApartmentState property.

Применяется к