CallContext
Provides a set of properties that are carried with the execution code path. This class cannot be inherited.
Remarks
CallContext is a specialized collection object similar to a Thread Local Storage for method calls and provides data slots数据槽 that are unique to each logical thread of execution.
The slots are not shared across call contexts on other logical threads.
Objects can be added to the CallContext as it travels down and back up the execution code path, and examined by various objects along the path.
When a remote method call is made to an object in another AppDomain, the CallContext class generates a LogicalCallContext instance that travels along with the remote call.
Only objects that expose the ILogicalThreadAffinative interface and are stored in the CallContext are propagated outside the AppDomain in a LogicalCallContext.
Objects that do not support this interface are not transmitted in LogicalCallContext instances with remote method calls.
Note:
All methods in CallContext are static and operate on the call context in the current Thread.
Note:
This class makes a link demand. A SecurityException is thrown if the immediate caller does not have infrastructure permission. See Link Demands for more information.
Examples
The following code example demonstrates the use of the CallContext class to transmit Principal and Identity Objects to a remote location for identification.
To view the code for the LogicalCallContextData class used in this sample, see the example for the ILogicalThreadAffinativeinterface.
To view the code for the HelloServiceClass class used in this sample, see the example for the GetData method.
To view the code for the server class used in this sample, see the example for the RegisterActivatedServiceType class.
[SecurityCriticalAttribute]
public static object GetData(
string name
)
扩展阅读
http://stackoverflow.com/questions/273301/callcontext-vs-threadstatic
http://piers7.blogspot.sg/2005/11/threadstatic-callcontext-and_02.html
