StringDictionary.IsSynchronized 属性
定义
获取一个值,该值指示是否同步对 StringDictionary 的访问(线程安全)。Gets a value indicating whether access to the StringDictionary is synchronized (thread safe).
public:
virtual property bool IsSynchronized { bool get(); };
public virtual bool IsSynchronized { get; }
member this.IsSynchronized : bool
Public Overridable ReadOnly Property IsSynchronized As Boolean
属性值
如果对 true 的访问是同步的(线程安全),则为 StringDictionary;否则为 false。true if access to the StringDictionary is synchronized (thread safe); otherwise, false.
示例
下面的代码示例演示如何使用在 SyncRoot 整个枚举过程中锁定集合。The following code example shows how to lock the collection using the SyncRoot during the entire enumeration.
StringDictionary^ myCollection = gcnew StringDictionary();
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);
}
}
StringDictionary myCollection = new StringDictionary();
lock(myCollection.SyncRoot)
{
foreach (Object item in myCollection)
{
// Insert your code here.
}
}
Dim myCollection As New StringDictionary()
SyncLock myCollection.SyncRoot
For Each item As Object In myCollection
' Insert your code here.
Next item
End SyncLock
检索此属性的值的运算复杂度为 O(1)。Retrieving the value of this property is an O(1) operation.
注解
StringDictionary实例未同步。A StringDictionary instance is not synchronized. 派生类可以使用属性提供的同步版本 StringDictionary SyncRoot 。Derived classes can provide a synchronized version of the StringDictionary using the SyncRoot property.
枚举整个集合本质上不是一个线程安全的过程。Enumerating through a collection is intrinsically not a thread-safe procedure. 即使某个集合已同步,其他线程仍可以修改该集合,这会导致枚举数引发异常。Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. 若要确保枚举过程中的线程安全性,可以在整个枚举期间锁定集合,或者捕获由其他线程进行的更改所导致的异常。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.