How to pass procedure while sending mail in asp.net

In ASP.NET, you can pass a procedure (or a method) as a parameter when sending an email using the System.Net.Mail namespace. Here are a few ways to do it:

Method 1: Using a delegate

You can create a delegate that points to the procedure you want to pass, and then pass the delegate as a parameter to the MailMessage constructor.

public void SendEmail(string subject, string body, Action<string> procedure)
{
    MailMessage mail = new MailMessage();
    mail.Subject = subject;
    mail.Body = body;

    // Pass the procedure as a delegate
    mail.Body += procedure("Hello, World!"); // Call the procedure and append the result to the body

    SmtpClient client = new SmtpClient();
    client.Send(mail);
}

// Example procedure
public string MyProcedure(string message)
{
    return $"Procedure called with message: {message}";
}

In this example, the SendEmail method takes an Action<string> delegate as a parameter, which points to the MyProcedure method. When the email is sent, the MyProcedure method is called with the message "Hello, World!" as an argument, and the result is appended to the email body.

Method 2: Using a lambda expression

You can use a lambda expression to create a small, anonymous procedure that can be passed as a parameter.

public void SendEmail(string subject, string body, Func<string> procedure)
{
    MailMessage mail = new MailMessage();
    mail.Subject = subject;
    mail.Body = body;

    // Pass the lambda expression as a parameter
    mail.Body += procedure().ToString(); // Call the lambda expression and append the result to the body

    SmtpClient client = new SmtpClient();
    client.Send(mail);
}

// Example lambda expression
Func<string> myProcedure = () => "Procedure called!";

In this example, the SendEmail method takes a Func<string> delegate as a parameter, which is a lambda expression that returns a string. When the email is sent, the lambda expression is called, and the result is appended to the email body.

Method 3: Using a dynamic method

You can use the System.Reflection.Emit namespace to create a dynamic method at runtime, and then pass it as a parameter.

public void SendEmail(string subject, string body, MethodInfo procedure)
{
    MailMessage mail = new MailMessage();
    mail.Subject = subject;
    mail.Body = body;

    // Pass the dynamic method as a parameter
    mail.Body += procedure.Invoke(null, new object[] { "Hello, World!" }); // Call the dynamic method and append the result to the body

    SmtpClient client = new SmtpClient();
    client.Send(mail);
}

// Example dynamic method
MethodInfo myProcedure = typeof(MyClass).GetMethod("MyProcedure");

In this example, the SendEmail method takes a MethodInfo object as a parameter, which represents the dynamic method MyProcedure. When the email is sent, the dynamic method is called with the message "Hello, World!" as an argument, and the result is appended to the email body.

These are just a few examples of how you can pass a procedure while sending an email in ASP.NET. The approach you choose will depend on your specific requirements and the complexity of your email processing logic.