Thread.GetData(LocalDataStoreSlot) Метод

public:
 static System::Object ^ GetData(LocalDataStoreSlot ^ slot);

public static object? GetData(LocalDataStoreSlot slot);

public static object GetData(LocalDataStoreSlot slot);

static member GetData : LocalDataStoreSlot -> obj

Public Shared Function GetData (slot As LocalDataStoreSlot) As Object

Параметры

Возвращаемое значение

Полученное значение.

Примеры

В этом разделе содержатся два примера кода. В первом примере показано, как использовать поле, помеченное ThreadStaticAttribute атрибутом для хранения сведений о потоке. Во втором примере показано, как использовать слот данных для выполнения одной и той же вещи.

Первый пример

В следующем примере показано, как использовать поле, помеченное для ThreadStaticAttribute хранения сведений о потоке. Этот метод обеспечивает лучшую производительность, чем метод, показанный во втором примере.

using System;
using System.Threading;

class Test
{
    static void Main()
    {
        for(int i = 0; i < 3; i++)
        {
            Thread newThread = new Thread(ThreadData.ThreadStaticDemo);
            newThread.Start();
        }
    }
}

class ThreadData
{
    [ThreadStatic]
    static int threadSpecificData;

    public static void ThreadStaticDemo()
    {
        // Store the managed thread id for each thread in the static
        // variable.
        threadSpecificData = Thread.CurrentThread.ManagedThreadId;
      
        // Allow other threads time to execute the same code, to show
        // that the static data is unique to each thread.
        Thread.Sleep( 1000 );

        // Display the static data.
        Console.WriteLine( "Data for managed thread {0}: {1}", 
            Thread.CurrentThread.ManagedThreadId, threadSpecificData );
    }
}

/* This code example produces output similar to the following:

Data for managed thread 4: 4
Data for managed thread 5: 5
Data for managed thread 3: 3
 */

open System
open System.Threading

type ThreadData() =
    // Create a static variable to hold the data for each thread.
    [<ThreadStatic; DefaultValue>]
    static val mutable private threadSpecificData : int

    static member ThreadStaticDemo() =
        // Store the managed thread id for each thread in the static
        // variable.
        ThreadData.threadSpecificData <- Thread.CurrentThread.ManagedThreadId
        
        // Allow other threads time to execute the same code, to show
        // that the static data is unique to each thread.
        Thread.Sleep 1000

        // Display the static data.
        printfn $"Data for managed thread {Thread.CurrentThread.ManagedThreadId}: {ThreadData.threadSpecificData}" 

for i = 0 to 2 do 
    let newThread = Thread ThreadData.ThreadStaticDemo
    newThread.Start()

// This code example produces output similar to the following:
//       Data for managed thread 4: 4
//       Data for managed thread 5: 5
//       Data for managed thread 3: 3

Imports System.Threading

Class Test

    <MTAThread> _
    Shared Sub Main()

        For i As Integer = 1 To 3
            Dim newThread As New Thread(AddressOf ThreadData.ThreadStaticDemo)
            newThread.Start()
        Next i

    End Sub

End Class

Class ThreadData

    <ThreadStatic> _
    Shared threadSpecificData As Integer

    Shared Sub ThreadStaticDemo()

        ' Store the managed thread id for each thread in the static
        ' variable.
        threadSpecificData = Thread.CurrentThread.ManagedThreadId
      
        ' Allow other threads time to execute the same code, to show
        ' that the static data is unique to each thread.
        Thread.Sleep( 1000 )

        ' Display the static data.
        Console.WriteLine( "Data for managed thread {0}: {1}", _
            Thread.CurrentThread.ManagedThreadId, threadSpecificData )

    End Sub

End Class

' This code example produces output similar to the following:
'
'Data for managed thread 4: 4
'Data for managed thread 5: 5
'Data for managed thread 3: 3

Второй пример

В следующем примере показано, как использовать слот данных для хранения сведений о потоке.

using System;
using System.Threading;

class Test
{
    static void Main()
    {
        Thread[] newThreads = new Thread[4];
        for(int i = 0; i < newThreads.Length; i++)
        {
            newThreads[i] = new Thread(
                new ThreadStart(Slot.SlotTest));
            newThreads[i].Start();
        }
    }
}

class Slot
{
    static Random randomGenerator;
    static LocalDataStoreSlot localSlot;

    static Slot()
    {
        randomGenerator = new Random();
        localSlot = Thread.AllocateDataSlot();
    }

    public static void SlotTest()
    {
        // Set different data in each thread's data slot.
        Thread.SetData(localSlot, randomGenerator.Next(1, 200));

        // Write the data from each thread's data slot.
        Console.WriteLine("Data in thread_{0}'s data slot: {1,3}", 
            AppDomain.GetCurrentThreadId().ToString(),
            Thread.GetData(localSlot).ToString());

        // Allow other threads time to execute SetData to show
        // that a thread's data slot is unique to the thread.
        Thread.Sleep(1000);

        Console.WriteLine("Data in thread_{0}'s data slot: {1,3}", 
            AppDomain.GetCurrentThreadId().ToString(),
            Thread.GetData(localSlot).ToString());
    }
}

open System
open System.Threading

module Slot =
    let randomGenerator = Random()
    let localSlot = Thread.AllocateDataSlot()


    let slotTest () =
        // Set different data in each thread's data slot.
        Thread.SetData(localSlot, randomGenerator.Next(1, 200))

        // Write the data from each thread's data slot.
        printfn $"Data in thread_{AppDomain.GetCurrentThreadId()}'s data slot: {Thread.GetData localSlot, 3}"

        // Allow other threads time to execute SetData to show
        // that a thread's data slot is unique to the thread.
        Thread.Sleep 1000

        printfn $"Data in thread_{AppDomain.GetCurrentThreadId()}'s data slot: {Thread.GetData localSlot, 3}"

let newThreads =
    [| for _ = 0 to 3 do
           let thread = Thread Slot.slotTest
           thread.Start()
           thread |]

Imports System.Threading

Class Test

    <MTAThread> _
    Shared Sub Main()
        Dim newThreads(3) As Thread
        For i As Integer = 0 To newThreads.Length - 1
            newThreads(i) = New Thread(AddressOf Slot.SlotTest)
            newThreads(i).Start()
        Next i
    End Sub

End Class

Public Class Slot

    Shared randomGenerator As Random
    Shared localSlot As LocalDataStoreSlot

    Shared Sub New()
        randomGenerator = new Random()
        localSlot = Thread.AllocateDataSlot()
    End Sub

    Shared Sub SlotTest()

        ' Set different data in each thread's data slot.
        Thread.SetData(localSlot, randomGenerator.Next(1, 200))

        ' Write the data from each thread's data slot.
        Console.WriteLine("Data in thread_{0}'s data slot: {1,3}", _
            AppDomain.GetCurrentThreadId().ToString(), _
            Thread.GetData(localSlot).ToString())

        ' Allow other threads time to execute SetData to show
        ' that a thread's data slot is unique to the thread.
        Thread.Sleep(1000)

        ' Write the data from each thread's data slot.
        Console.WriteLine("Data in thread_{0}'s data slot: {1,3}", _
            AppDomain.GetCurrentThreadId().ToString(), _
            Thread.GetData(localSlot).ToString())
    End Sub

End Class

Комментарии

Потоки используют механизм памяти локального хранилища для хранения данных, относящихся к потоку. Среда CLR выделяет массив хранилища данных с несколькими слотами для каждого процесса при его создании. Поток может выделить слот данных в хранилище данных, сохранить и получить значение данных в слоте, а также освободить слот для повторного использования после истечения срока действия потока. Слоты данных уникальны для каждого потока. Ни один другой поток (даже не дочерний поток) не может получить эти данные.

См. также раздел

• SetData(LocalDataStoreSlot, Object)
• Потоки и работа с потоками
• Локальное хранилище потоков: Thread-Relative статические поля и слоты данных