Cer Enumeration
Assembly: mscorlib (in mscorlib.dll)
| Member name | Description | |
|---|---|---|
| MayFail | In the face of exceptional conditions, the method might fail. In this case, the method will report back to the calling method whether it succeeded or failed. The method must have a CER around the method body to ensure that it can report the return value. | |
| None | The method, type, or assembly has no concept of a CER. It does not take advantage of CER guarantees. This implies the following:
If a method, type, or assembly is not explicitly marked to succeed, it is implicitly marked as Cer.None. | |
| Success | In the face of exceptional conditions, the method is guaranteed to succeed. You should always construct a CER around the method that is called, even when it is called from within a non-CER region. A method is successful if it accomplishes what is intended. For example, marking Count with ReliabilityContractAttribute(Cer.Success) implies that when it is run under a CER, it always returns a count of the number of elements in the ArrayList and it can never leave the internal fields in an undetermined state. |
The Cer enumeration specifies the behavior of a method, type, or assembly within a constrained execution region (CER). Use one of the three available values to indicate that the entity will succeed, has no knowledge of a CER, or might (deterministically) be able to report success or failure.
A CER provides guarantees that the region of code will execute uninterrupted even if an asynchronous exception such as an aborted thread out-of-memory exception, or stack overflow is raised.
The following code example demonstrates the use of the Cer enumeration when specifying a constrained execution region for a method. This code example is part of a larger example provided for the ReliabilityContractAttribute constructor.
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] [MethodImpl(MethodImplOptions.NoInlining)] void StackDepth2() { try { consistentLevel2 = false; if (depth == 2) Thread.Sleep(-1); StackDepth3(); } finally { consistentLevel2 = true; } }
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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