Log additional info OnEntry or OnSuccess

Question

is there a way to log username or user id (or some additional data) together with parameters on OnEntry/OnSuccess/OnException.

I need my log record to look like:

"... Method MethodName invoked with params [param1: value1, param2: value2 ...] by User : [username]"

Thanks.

Answer 1

The following code is taken from the Postsharp documentation site at Trace Sample with some minor modification

using System;
using System.Diagnostics;
using System.Reflection;
using PostSharp.Aspects;

namespace Samples
{
    [Serializable]
    public sealed class TraceAttribute : OnMethodBoundaryAspect
    {
        // This field is initialized and serialized at build time, then deserialized at runtime. 
        private readonly string category;

        // These fields are initialized at runtime. They do not need to be serialized.
        [NonSerialized] private string enteringMessage;
        [NonSerialized] private string exitingMessage;

        // Default constructor, invoked at build time. 
        public TraceAttribute()
        {
        }

        // Constructor specifying the tracing category, invoked at build time. 
        public TraceAttribute(string category)
        {
            this.category = category;
        }


        // Invoked only once at runtime from the static constructor of type declaring the target method. 
        public override void RuntimeInitialize(MethodBase method)
        {
            string methodName = method.DeclaringType.FullName + method.Name;
            this.enteringMessage = "Entering " + methodName;
            this.exitingMessage = "Exiting " + methodName;
        }

        // Invoked at runtime before that target method is invoked. 
        public override void OnEntry(MethodExecutionArgs args)
        {
            Trace.WriteLine(this.enteringMessage, this.category);
            DisplayArgs(args);
        }

        // Invoked at runtime after the target method is invoked (in a finally block). 
        public override void OnExit(MethodExecutionArgs args)
        {
            Trace.WriteLine(this.exitingMessage, this.category);
            DisplayArgs(args);
        }
    }
}

private void DisplayArgs(MethodExecutionArgs args)
{
    var parameters = args.Method.GetParameters();
    var arguments = args.Arguments;
    var zipped = parameters.Zip(arguments, (f,s) => f.Name + ":" + s == null ? "null" : s.ToString());
    string traceLine = string.Format("invoked with params [{0}] by User:[{1}]", string.Join(",", zipped),
    System.Security.Principal.WindowsIdentity.GetCurrent().Name);
    System.Diagnostics.Trace.TraceInformation(traceLine);
}