ReaderWriterLockSlim.IsUpgradeableReadLockHeld 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
获取一个值，该值指示当前线程是否已进入可升级模式的锁定状态。
public:
property bool IsUpgradeableReadLockHeld { bool get(); };public bool IsUpgradeableReadLockHeld { get; }member this.IsUpgradeableReadLockHeld : boolPublic ReadOnly Property IsUpgradeableReadLockHeld As Boolean属性值
如果当前线程已进入可升级模式，则为 true；否则为 false。
示例
以下示例演示如何在当前线程意外进入可升级模式时使用 IsUpgradeableReadLockHeld 属性生成断言。
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))
注解
此属性适用于断言或其他调试目的。 不要使用它来控制程序执行流。
