Thread.SetApartmentState(ApartmentState) Método

public:
 void SetApartmentState(System::Threading::ApartmentState state);

public void SetApartmentState(System.Threading.ApartmentState state);

member this.SetApartmentState : System.Threading.ApartmentState -> unit

Public Sub SetApartmentState (state As ApartmentState)

Parâmetros

Exceções

Exemplos

O exemplo de código seguinte demonstra os GetApartmentStatemétodos , SetApartmentState, e TrySetApartmentState . O exemplo de código cria um thread. Antes de iniciar o thread, GetApartmentState apresenta o estado inicial ApartmentState.Unknown e SetApartmentState altera o estado para ApartmentState.STA. O TrySetApartmentState método depois regressa false ao tentar mudar o estado para ApartmentState.MTA porque o estado do apartamento já está definido. Se a mesma operação tivesse sido tentada com SetApartmentState, InvalidOperationException teria sido cancelada.

Depois de iniciada a thread, o TrySetApartmentState método é usado novamente. Desta vez, ele lança ThreadStateException porque o tópico já foi iniciado.

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.
 */

open System.Threading

let threadProc () = Thread.Sleep 2000

let t = Thread threadProc
printfn $"Before setting apartment state: {t.GetApartmentState()}"

t.SetApartmentState ApartmentState.STA
printfn $"After setting apartment state: {t.GetApartmentState()}"

let result = t.TrySetApartmentState ApartmentState.MTA
printfn $"Try to change state: {result}"

t.Start()

Thread.Sleep 500

try
    t.TrySetApartmentState ApartmentState.STA |> ignore
with :? ThreadStateException ->
    printfn "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.

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.

Observações

As novas threads são inicializadas como ApartmentState.MTA se o estado do apartamento não tivesse sido definido antes de serem iniciadas. O estado do apartamento tem de ser definido antes de iniciar um tópico.

O SetApartmentState método, juntamente com o GetApartmentState método e o TrySetApartmentState método, substitui a ApartmentState propriedade.