SortedList.IsSynchronized Properti

Definisi

Ruang nama:

System.Collections

Rakitan:

System.Collections.NonGeneric.dll

Sumber:

SortedList.cs

Mendapatkan nilai yang menunjukkan apakah akses ke SortedList objek disinkronkan (utas aman).

public:
 virtual property bool IsSynchronized { bool get(); };

public virtual bool IsSynchronized { get; }

member this.IsSynchronized : bool

Public Overridable ReadOnly Property IsSynchronized As Boolean

Nilai Properti

Boolean

true jika akses ke objek disinkronkan SortedList (utas aman); jika tidak, false. Default adalah false.

Penerapan

IsSynchronized

Contoh

Contoh kode berikut menunjukkan cara mengunci koleksi menggunakan SyncRoot properti selama seluruh enumerasi.

SortedList^ myCollection = gcnew SortedList();
bool lockTaken = false;
try
{
    Monitor::Enter(myCollection->SyncRoot, lockTaken);
    for each (Object^ item in myCollection);
    {
        // Insert your code here.
    }
}
finally
{
    if (lockTaken)
    {
        Monitor::Exit(myCollection->SyncRoot);
    }
}

SortedList myCollection = new SortedList();
lock (myCollection.SyncRoot)
{
    foreach (object item in myCollection)
    {
        // Insert your code here.
    }
}

Dim myCollection As New SortedList()
SyncLock myCollection.SyncRoot
    For Each item In myCollection
        ' Insert your code here.
    Next item
End SyncLock

Mengambil nilai properti ini adalah O(1) operasi.

Contoh kode berikut menunjukkan cara menyinkronkan SortedList objek, menentukan apakah SortedList disinkronkan, dan menggunakan yang disinkronkan SortedList.

#using <system.dll>

using namespace System;
using namespace System::Collections;
int main()
{
   
   // Creates and initializes a new SortedList.
   SortedList^ mySL = gcnew SortedList;
   mySL->Add( 2, "two" );
   mySL->Add( 3, "three" );
   mySL->Add( 1, "one" );
   mySL->Add( (int^)0, "zero" );
   mySL->Add( 4, "four" );
   
   // Creates a synchronized wrapper around the SortedList.
   SortedList^ mySyncdSL = SortedList::Synchronized( mySL );
   
   // Displays the sychronization status of both SortedLists.
   Console::WriteLine( "mySL is {0}.", mySL->IsSynchronized ? (String^)"synchronized" : "not synchronized" );
   Console::WriteLine( "mySyncdSL is {0}.", mySyncdSL->IsSynchronized ? (String^)"synchronized" : "not synchronized" );
}

/*
This code produces the following output.

mySL is not synchronized.
mySyncdSL is synchronized.
*/

using System;
using System.Collections;

public class SamplesSortedList
{
    public static void Main()
    {
        // Creates and initializes a new SortedList.
        SortedList mySL = new SortedList();
        mySL.Add(2, "two");
        mySL.Add(3, "three");
        mySL.Add(1, "one");
        mySL.Add(0, "zero");
        mySL.Add(4, "four");

        // Creates a synchronized wrapper around the SortedList.
        SortedList mySyncdSL = SortedList.Synchronized(mySL);

        // Displays the sychronization status of both SortedLists.
        Console.WriteLine("mySL is {0}.", mySL.IsSynchronized ? "synchronized" : "not synchronized");
        Console.WriteLine("mySyncdSL is {0}.", mySyncdSL.IsSynchronized ? "synchronized" : "not synchronized");
    }
}
/*
This code produces the following output.

mySL is not synchronized.
mySyncdSL is synchronized.
*/

Imports System.Collections

Public Class SamplesSortedList
    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new SortedList.
        Dim mySL As New SortedList()
        mySL.Add(2, "two")
        mySL.Add(3, "three")
        mySL.Add(1, "one")
        mySL.Add(0, "zero")
        mySL.Add(4, "four")
        
        ' Creates a synchronized wrapper around the SortedList.
        Dim mySyncdSL As SortedList = SortedList.Synchronized(mySL)
        
        ' Displays the sychronization status of both SortedLists.
        Dim msg As String
        If mySL.IsSynchronized Then
            msg = "synchronized"
        Else
            msg = "not synchronized"
        End If
        Console.WriteLine("mySL is {0}.", msg)
        If mySyncdSL.IsSynchronized Then
            msg = "synchronized"
        Else
            msg = "not synchronized"
        End If
        Console.WriteLine("mySyncdSL is {0}.", msg)        
    End Sub
End Class

' This code produces the following output.
'
' mySL is not synchronized.
' mySyncdSL is synchronized.

Keterangan

Untuk menjamin keamanan SortedList utas objek, semua operasi harus dilakukan melalui pembungkus yang Synchronized dikembalikan oleh metode .

Menghitung melalui koleksi secara intrinsik bukan prosedur aman utas. Bahkan ketika koleksi disinkronkan, utas lain masih dapat memodifikasi koleksi, yang menyebabkan enumerator melemparkan pengecualian. Untuk menjamin keamanan utas selama enumerasi, Anda dapat mengunci koleksi selama seluruh enumerasi atau menangkap pengecualian yang dihasilkan dari perubahan yang dibuat oleh utas lain.

Lihat juga

• SyncRoot
• Synchronized(SortedList)