intercept.cs

public void Intercept(IInvocation invocation)
{
    var logger = LogManager.GetLogger(invocation.TargetType);
    try
    {
        StringBuilder sb = null;
        if (logger.IsDebugEnabled)
        {
            sb = new StringBuilder(invocation.TargetType.FullName)
                .Append(".")
                .Append(invocation.Method)
                .Append("(");
            for (int i = 0; i < invocation.Arguments.Length; i++)
            {
                if (i > 0)
                    sb.Append(", ");
                sb.Append(invocation.Arguments[i]);
            }
            sb.Append(")");
            logger.Debug(sb);
        }

        invocation.Proceed();
        if (logger.IsDebugEnabled)
        {

            logger.Debug("Result of " + sb + " is: " + invocation.ReturnValue);
        }
    }
    catch (Exception e)
    {
        logger.Error(e);
        throw;
    }
}