SortedList::IsSynchronized Property


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Gets a value indicating whether access to a SortedList object is synchronized (thread safe).

Namespace:   System.Collections
Assembly:  mscorlib (in mscorlib.dll)

property bool IsSynchronized {
	virtual bool get();

Property Value

Type: System::Boolean

true if access to the SortedList object is synchronized (thread safe); otherwise, false. The default is false.

To guarantee the thread safety of a SortedList object, all operations must be done through the wrapper returned by the Synchronized method.

Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.

The following code example shows how to lock a collection using the SyncRoot property during the entire enumeration.

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

Retrieving the value of this property is an O(1) operation.

The following code example shows how to synchronize a SortedList object, determine whether a SortedList is synchronized, and use a synchronized 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.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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