SearchResultCollection.ICollection.IsSynchronized 屬性


取得值,這個值表示對 ICollection 的存取是否同步 (安全執行緒)。Gets a value indicating whether access to the ICollection is synchronized (thread safe).

property bool System::Collections::ICollection::IsSynchronized { bool get(); };
bool System.Collections.ICollection.IsSynchronized { get; }
 ReadOnly Property IsSynchronized As Boolean Implements ICollection.IsSynchronized


如果 true 的存取為同步 (安全執行緒),則為 ICollection,否則為 falsetrue if access to the ICollection is synchronized (thread safe); otherwise, false.



SyncRoot 會傳回物件,該物件可用來同步處理對 ICollection 的存取。SyncRoot returns an object, which can be used to synchronize access to the ICollection.

命名空間中大部分的System.Collections集合類別也會執行同步處理的方法, 它會在基礎集合周圍提供同步的包裝函式。Most collection classes in the System.Collections namespace also implement a Synchronized method, which provides a synchronized wrapper around the underlying collection.

透過集合進行列舉, 本質上並不是安全線程的程式。Enumerating through a collection is intrinsically not a thread safe procedure. 即使集合經過同步化,其他的執行緒仍可修改該集合,使列舉值擲回例外狀況。Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. 若要保證列舉過程的執行緒安全,您可以在整個列舉過程中鎖定集合,或攔截由其他執行緒的變更所造成的例外狀況。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.

[Visual Basic, C#][Visual Basic, C#]

下列程式碼範例示範如何在整個列舉SyncRoot期間使用鎖定集合:The following code example shows how to lock the collection using the SyncRoot during the entire enumeration:

ICollection myCollection = new ICollection();  
  lock(myCollection.SyncRoot) {  
  foreach (Object item in myCollection) {  
  // Insert your code here.  
Dim myCollection As New ICollection()  
 Dim item As Object  
 SyncLock myCollection.SyncRoot  
  For Each item In myCollection  
  ' Insert your code here.  
  Next item  
 End SyncLock