属性によるカスタムインストゥルメンテーション(.NET)

static void Main(string[] args)
{
    OuterMethod();
}

[Transaction]
public void OuterMethod()
{
    InnerMethod();
}

[Transaction]
public void InnerMethod()
{
    // inner method code
}

[Transaction(Web = true)]

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            var test = new MyClass();
            test.Method1(); // Creates a transaction named Method1 in the Web category.
            test.Method2(); // Creates a transaction named Method2 in the Custom category.
            test.Method3(); // Creates a transaction named Method2 in the Custom category.

            // Method4 won't create a new transaction, 
            // only add a segment to an existing transaction
            test.Method4();
        }
    }

    public class MyClass
    {
        // The agent creates a Web transaction that includes an external service 
        // request in its transaction traces.
        [Transaction(Web = true)]
        public void Method1()
        {
            new WebClient().DownloadString("https://www.google.com/");
        }

        // Creates a Custom transaction containing one segment.
        [Transaction]
        public void Method2()
        {
            // The Method3 segment will be created
            Method3();
            // The Method4 segment will contain your SQL query inside of it and 
            // possibly an execution plan.
            Method4();
        }

        // Method3 will be appear as a segment when called in Method2()
        // but will create a transaction when called directly in Main()
        [Transaction]
        public void Method3()
        {
            Thread.Sleep(1000);
        }

        // When Method4 is called directly in Main() the agent will not create a transaction.
        // However, when Method4 is called from Method2, Method4 will 
        // appear as a segment containing its SQL query.
        [Trace]
        public void Method4()
        {
            using (var connection = new SqlConnection(ConnectionStrings["MsSqlConnection"].ConnectionString))
            {
                connection.Open();
                using (var command = new SqlCommand("SELECT * FROM table", connection))
                using (var reader = command.ExecuteReader())
                {
                    reader.Read();
                }
            }
        }
    }
}