LockRecursionException Class

July 28, 2014

The exception that is thrown when recursive entry into a lock is not compatible with the recursion policy for the lock.

System.Object
  System.Exception
    System.Threading.LockRecursionException

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

public class LockRecursionException : Exception

The LockRecursionException type exposes the following members.

  NameDescription
Public methodLockRecursionException()Initializes a new instance of the LockRecursionException class with a system-supplied message that describes the error.
Public methodLockRecursionException(String)Initializes a new instance of the LockRecursionException class with a specified message that describes the error.
Public methodLockRecursionException(String, Exception)Initializes a new instance of the LockRecursionException class with a specified error message and a reference to the inner exception that is the cause of this exception.
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  NameDescription
Public propertyDataGets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.)
Public propertyHelpLinkGets or sets a link to the help file associated with this exception. (Inherited from Exception.)
Public propertyHResultGets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.)
Public propertyInnerExceptionGets the Exception instance that caused the current exception. (Inherited from Exception.)
Public propertyMessageGets a message that describes the current exception. (Inherited from Exception.)
Public propertySourceGets or sets the name of the application or the object that causes the error. (Inherited from Exception.)
Public propertyStackTraceGets a string representation of the frames on the call stack at the time the current exception was thrown. (Inherited from Exception.)
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  NameDescription
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetBaseExceptionWhen overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the runtime type of the current instance. (Inherited from Exception.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringCreates and returns a string representation of the current exception. (Inherited from Exception.)
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LockRecursionException is thrown for several reasons, including the following:

  • If a thread tries to enter an instance of ReaderWriterLockSlim recursively, but the instance does not support recursion.

  • If a thread tries to enter a ReaderWriterLockSlim instance in write mode or upgradeable mode when the thread initially entered the lock in read mode. This represents a potential deadlock and therefore is not allowed.

  • If allowing one more level of recursion would exceed the maximum value for the internal storage counter used to track recursions. This limit is so large that applications should never encounter it.

The following example shows two causes of LockRecursionException when using the ReaderWriterLockSlim class. The program creates a ReaderWriterLockSlim by using the default constructor, which disallows recursion. The program then starts a thread that enters the lock in read mode. The thread tries to enter the lock recursively in read mode, and catches the resulting exception. Finally, the thread tries to enter write mode, which would create a potential for deadlocks. The thread catches the resulting exception.

Windows Phone OS

Supported in: 8.1, 8.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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