Tries to enter the lock in read mode.
Assembly: System.Core (in System.Core.dll)
This method blocks until the calling thread enters the lock, and therefore might never return. Use the TryEnterReadLock method to block for a specified interval, and then return if the calling thread has not entered read mode during that interval.
Multiple threads can enter read mode at the same time.
If one or more threads are waiting to enter write mode, a thread that calls the method blocks until those threads have either timed out or entered write mode and then exited from it.
If a lock allows recursion, a thread that has entered the lock in read mode can enter read mode recursively, even if other threads are waiting to enter write mode.
At most one thread can be in upgradeable mode while other threads are in read mode. If additional threads are waiting to enter upgradeable mode, and there are no threads waiting to enter write mode, threads that call the method enter read mode immediately and do not block.
The following example shows how to use the method to enter the lock in read mode. The method shown in the example retrieves the value associated with a key. If the key is not found, the exception thrown by the inner Dictionary<TKey, TValue> is allowed to terminate the method. A finally block is used to execute the ExitReadLock method, ensuring that the caller exits read mode.
This code is part of a larger example provided for the ReaderWriterLockSlim class.
.NET FrameworkSupported in: 4.5, 4, 3.5
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
.NET for Windows Phone appsSupported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.