ReaderWriterLockSlim.IsUpgradeableReadLockHeld 屬性

定義

命名空間:

System.Threading

組件:

System.Threading.dll

來源:

ReaderWriterLockSlim.cs

取得值，表示目前執行緒是否已進入可升級模式的鎖定。

public:
 property bool IsUpgradeableReadLockHeld { bool get(); };

public bool IsUpgradeableReadLockHeld { get; }

member this.IsUpgradeableReadLockHeld : bool

Public ReadOnly Property IsUpgradeableReadLockHeld As Boolean

屬性值

Boolean

如果目前執行緒已進入可升級模式，則為 true，否則為 false。

範例

下列範例示範如何使用 IsUpgradeableReadLockHeld 屬性，在目前的執行緒意外進入可升級模式時產生判斷提示。

using (ReaderWriterLockSlim rwLock = new ReaderWriterLockSlim()) {

Using rwLock As New ReaderWriterLockSlim()

Debug.Assert(!rwLock.IsUpgradeableReadLockHeld,
    String.Format("Thread {0} has entered the upgradeable read lock while MyFunction is still executing.",
                  Thread.CurrentThread.ManagedThreadId));

Debug.Assert(Not rwLock.IsUpgradeableReadLockHeld, _
    String.Format("Thread {0} has entered the upgradeable read lock while MyFunction is still executing.", _
                  Thread.CurrentThread.ManagedThreadId))

備註

這個屬性適用于判斷提示或其他偵錯用途。 請勿使用它來控制程式執行的流程。