ReaderWriterLockSlim.WaitingUpgradeCount 属性
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。
获取等待进入可升级模式锁定状态的线程总数。
public:
property int WaitingUpgradeCount { int get(); };C#
public int WaitingUpgradeCount { get; }member this.WaitingUpgradeCount : intPublic ReadOnly Property WaitingUpgradeCount As Integer等待进入可升级模式的线程总数。
以下示例演示如何使用 WaitingUpgradeCount 属性生成事件日志条目（如果阻止的线程数（等待进入可升级模式）超过阈值。
C#
using (ReaderWriterLockSlim rwLock = new ReaderWriterLockSlim()) {
Using rwLock As New ReaderWriterLockSlim()
C#
int waitingUpgradeableReadCt = rwLock.WaitingUpgradeCount;
if (waitingUpgradeableReadCt > UPGRADEABLEREAD_THRESHOLD)
{
performanceLog.WriteEntry(String.Format(
"{0} blocked upgradeable reader threads; exceeds recommended maximum.",
waitingUpgradeableReadCt));
}
Dim waitingUpgradeableReadCt As Integer = rwLock.WaitingUpgradeCount
If waitingUpgradeableReadCt > UPGRADEABLEREAD_THRESHOLD Then
performanceLog.WriteEntry(String.Format( _
"{0} blocked upgradeable reader threads; exceeds recommended maximum.", _
waitingUpgradeableReadCt))
End If
仅对调试、分析和日志记录目的使用此属性，而不是控制算法的行为。 一旦计算结果，结果就会发生更改。 因此，基于此属性做出决策是不安全的。
| 产品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7 |
| .NET Framework | 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 |
| .NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
| UWP | 10.0 |