Thread.ThreadState プロパティ

.NET Framework クラス ライブラリ リファレンス

Thread.ThreadState プロパティ

現在のスレッドの状態を示す値を取得します。

名前空間: System.Threading
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public ReadOnly Property
 ThreadState As ThreadState

Visual Basic (使用法)

Dim instance As Thread
Dim value As ThreadState

value = instance.ThreadState

C#

public ThreadState ThreadState { get; }

C++

public:
property ThreadState ThreadState {
    ThreadState get ();
}

J#

/** @property */
public ThreadState get_ThreadState ()

JScript

public function get ThreadState
 () : ThreadState

プロパティ値
現在のスレッドの状態を示す ThreadState 値の 1 つ。初期値は Unstarted です。

解説

ThreadState プロパティは、IsAlive プロパティよりも詳細な情報を提供します。

重要 :
スレッド状態が重要になるのは、デバッグする場合だけです。コードでは、スレッド状態を使用して、スレッドの動作を同期しないでください。

使用例

スレッドの ThreadState にアクセスするコード例を次に示します。

Visual Basic

Imports Microsoft.VisualBasic
Imports System
Imports System.Threading

Public Class ApartmentTest

    <MTAThread> _
    Shared Sub Main()
    
        Dim newThread As Thread = New
 Thread(AddressOf ThreadMethod)
        newThread.SetApartmentState(ApartmentState.MTA)

        ' The following line is ignored since 
        ' ApartmentState can only be set once.
        newThread.SetApartmentState(ApartmentState.STA)

        Console.WriteLine("ThreadState: {0}, ApartmentState: {1}",
 _
            newThread.ThreadState, newThread.GetApartmentState())

        newThread.Start()

        ' Wait for newThread to start and go to sleep.
        Thread.Sleep(300)
        Try
            ' This causes an exception since newThread is sleeping.
            newThread.SetApartmentState(ApartmentState.STA)
        Catch stateException As ThreadStateException
            Console.WriteLine(vbCrLf & "{0} caught:"
 & vbCrLf & _
                "Thread is not In the Unstarted or Running state.",
 _
                stateException.GetType().Name)
            Console.WriteLine("ThreadState: {0}, ApartmentState:
 " & _
                "{1}", newThread.ThreadState, newThread.GetApartmentState())
        End Try

    End Sub

    Shared Sub ThreadMethod()
        Thread.Sleep(1000)
    End Sub

End Class

C#

using System;
using System.Threading;

class ApartmentTest
{
    static void Main()
    {
        Thread newThread = 
            new Thread(new ThreadStart(ThreadMethod));
        newThread.SetApartmentState(ApartmentState.MTA);

        // The following line is ignored since 
        // ApartmentState can only be set once.
        newThread.SetApartmentState(ApartmentState.STA);

        Console.WriteLine("ThreadState: {0}, ApartmentState: {1}", 
            newThread.ThreadState, newThread.ApartmentState);

        newThread.Start();

        // Wait for newThread to start and go to sleep.
        Thread.Sleep(300);
        try
        {
            // This causes an exception since newThread is sleeping.
            newThread.SetApartmentState(ApartmentState.STA);
        }
        catch(ThreadStateException stateException)
        {
            Console.WriteLine("\n{0} caught:\n" +
                "Thread is not in the Unstarted or Running
 state.", 
                stateException.GetType().Name);
            Console.WriteLine("ThreadState: {0}, ApartmentState: {1}",
                newThread.ThreadState, newThread.GetApartmentState());
        }
    }

    static void ThreadMethod()
    {
        Thread.Sleep(1000);
    }
}

C++

using namespace System;
using namespace System::Threading;
ref class ApartmentTest
{
public:
   static void ThreadMethod()
   {
      Thread::Sleep( 1000 );
   }

};

int main()
{
   Thread^ newThread = gcnew Thread( gcnew ThreadStart( &ApartmentTest::ThreadMethod
 ) );
   newThread->SetApartmentState(ApartmentState::MTA);
   
   // The following line is ignored since 
   // ApartmentState can only be set once.
   newThread->SetApartmentState(ApartmentState::STA);
   Console::WriteLine( "ThreadState: {0}, ApartmentState: {1}", newThread->ThreadState.ToString(),
 newThread->GetApartmentState().ToString() );
   newThread->Start();
   
   // Wait for newThread to start and go to sleep.
   Thread::Sleep( 300 );
   try
   {
      
      // This causes an exception since newThread is sleeping.
      newThread->SetApartmentState(ApartmentState::STA);
   }
   catch ( ThreadStateException^ stateException ) 
   {
      Console::WriteLine( "\n{0} caught:\n"
      "Thread is not in the Unstarted or Running state.",
 stateException->GetType()->Name );
      Console::WriteLine( "ThreadState: {0}, ApartmentState: {1}", newThread->ThreadState.ToString(),
 newThread->GetApartmentState().ToString() );
   }

}

J#

import System.*;
import System.Threading.*;
import System.Threading.Thread;    

class ApartmentTest
{
    public static void main(String[]
 args)
    {
        Thread newThread = new Thread(new ThreadStart(ThreadMethod));

        newThread.set_ApartmentState(ApartmentState.MTA);

        // The following line is ignored since 
        // ApartmentState can only be set once.
        newThread.set_ApartmentState(ApartmentState.STA);
        Console.WriteLine("ThreadState: {0}, ApartmentState: {1}",
                        newThread.get_ThreadState(),
                        newThread.get_ApartmentState());
        newThread.Start();

        // Wait for newThread to start and go to sleep.
        Thread.Sleep(300);
        try {
            // This causes an exception since newThread is sleeping.
            newThread.set_ApartmentState(ApartmentState.STA);
        }
        catch (ThreadStateException stateException) {
            Console.WriteLine("\n{0} caught:\n" + 
                "Thread is not in the Unstarted or Running
 state.", 
                stateException.GetType().get_Name());
            Console.WriteLine("ThreadState: {0}, ApartmentState: {1}",
                newThread.get_ThreadState(),newThread.get_ApartmentState());
        }
    } //main

    static void ThreadMethod()
    {
        Thread.Sleep(1000);
    } //ThreadMethod
} //ApartmentTest

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
Thread クラス
Thread メンバ
System.Threading 名前空間
その他の技術情報
マネージ スレッドの状態