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CorrelationManager Class

Correlates traces that are part of a logical transaction.


Namespace:  System.Diagnostics
Assembly:  System (in System.dll)
public class CorrelationManager

The CorrelationManager type exposes the following members.

Public propertyActivityIdGets or sets the identity for a global activity.
Public propertyLogicalOperationStackGets the logical operation stack from the call context.
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 it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodStartLogicalOperation()Starts a logical operation on a thread.
Public methodStartLogicalOperation(Object)Starts a logical operation with the specified identity on a thread.
Public methodStopLogicalOperationStops the current logical operation.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Traces generated from a single logical operation can be tagged with an operation-unique identity, in order to distinguish them from traces from a different logical operation. For example, it may be useful to group correlated traces by ASP.NET request. The CorrelationManager class provides methods used to store a logical operation identity in a thread-bound context and automatically tag each trace event generated by the thread with the stored identity.

Logical operations can also be nested. The LogicalOperationStack property exposes the stack of nested logical operation identities. Each call to the StartLogicalOperation method pushes a new logical operation identity onto the stack. Each call to the StopLogicalOperation method pops a logical operation identity off the stack.


Logical operation identities are objects, allowing the use of a type for a logical operation identity.

The following code example demonstrates the use of the CorrelationManager class by identifying the logical operation associated with a traced event. Two logical operations are started, one in the main thread and the other in a worker thread. An error event is logged in both logical operations.

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Threading;

namespace CorrlationManager
    class Program
        //private static TraceSource ts; 
        static void Main(string[] args)
            TraceSource ts = new TraceSource("MyApp");
            int i = ts.Listeners.Add(new ConsoleTraceListener());
            ts.Listeners[i].TraceOutputOptions = TraceOptions.LogicalOperationStack;
            ts.Switch = new SourceSwitch("MyAPP", "Verbose");
            // Start the logical operation on the Main thread.
            ts.TraceEvent(TraceEventType.Error, 1, "Trace an error event.");
            Thread t = new Thread(new ThreadStart(ThreadProc));
            // Start the worker thread.
            // Give the worker thread a chance to execute.
        public static void ThreadProc()
            TraceSource ts = new TraceSource("MyApp");
            int i = ts.Listeners.Add(new ConsoleTraceListener());
            ts.Listeners[i].TraceOutputOptions = TraceOptions.LogicalOperationStack;
            ts.Switch = new SourceSwitch("MyAPP", "Verbose");
            // Add another logical operation.
            ts.TraceEvent(TraceEventType.Error, 1, "Trace an error event.");
// This sample generates the following output: 
//MyApp Error: 1 : Trace an error event. 
//    LogicalOperationStack=MainThread 
//MyApp Error: 1 : Trace an error event. 
//    LogicalOperationStack=WorkerThread, MainThread

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.

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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