ReaderWriterLockSlim.IsUpgradeableReadLockHeld Property


Gets a value that indicates whether the current thread has entered the lock in upgradeable mode.

Namespace:   System.Threading
Assembly:  System.Core (in System.Core.dll)

public bool IsUpgradeableReadLockHeld { get; }

Property Value

Type: System.Boolean

true if the current thread has entered upgradeable mode; otherwise, false.

This property is intended for use in asserts or for other debugging purposes. Do not use it to control the flow of program execution.

The following example shows how to use the IsUpgradeableReadLockHeld property to generate an assert if the current thread has entered upgradeable mode unexpectedly.

using (ReaderWriterLockSlim rwLock = new ReaderWriterLockSlim()) {
    String.Format("Thread {0} has entered the upgradeable read lock while MyFunction is still executing.",

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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