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public class Car { // The set of connected sinks ArrayList clientSinks = new ArrayList(); // Attach or disconnect from the source of events public void Advise(IEngineEvents sink) { clientSinksAdd(sink); } public void Unadvise(IEngineEvents sink) { clientSinksRemove(sink); } .. } To actually send the events, let s update the CarAccelerate() method to iterate over the list of connections maintained by the ArrayList and fire the correct notification when appropriate (note the Car class now maintains a Boolean member variable named carIsDead to represent the engine s state): // Interface-based event protocol! class Car { .. // Is the car alive or dead bool carIsDead; public void Accelerate(int delta) {.

// If the car is 'dead', send Exploded event to each sink. if(carIsDead) { foreach(IEngineEvents e in clientSinks) e.Exploded("Sorry, this car is dead..."); } else { currSpeed += delta; // Send AboutToBlow event. if(10 == maxSpeed - currSpeed) { foreach(IEngineEvents e in clientSinks) e.AboutToBlow("Careful buddy! Gonna blow!"); } if(currSpeed >= maxSpeed) carIsDead = true; else Console.WriteLine("\tCurrSpeed = {0} ", currSpeed); } } Here is some client-side code, now making use of a callback interface to listen to the Car events: // Make a car and listen to the events. public class CarApp { static void Main(string[] args) { Console.WriteLine("***** Interfaces as event enablers *****"); Car c1 = new Car("SlugBug", 100, 10); // Make sink object. CarEventSink sink = new CarEventSink(); // Pass the Car a reference to the sink. c1.Advise(sink); // Speed up (this will trigger the events). for(int i = 0; i < 10; i++) c1.Accelerate(20); // Detach from event source. c1.Unadvise(sink); Console.ReadLine(); } } Figure 8-1 shows the end result of this interface-based event protocol.

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Do note that the Unadvise() method can be very helpful in that it allows the caller to selectively detach from an event source at will. Here, you call Unadvise() before exiting Main(), although this is not technically necessary. However, assume that the application now wishes to register two sinks, dynamically remove a particular sink during the flow of execution, and continue processing the program at large: static void Main(string[] args) { Console.WriteLine("***** Interfaces as event enablers *****"); Car c1 = new Car("SlugBug", 100, 10); // Make 2 sink objects. Console.WriteLine("***** Creating sinks *****"); CarEventSink sink = new CarEventSink("First sink"); CarEventSink myOtherSink = new CarEventSink("Other sink"); // Hand sinks to Car. Console.WriteLine("\n***** Sending 2 sinks into Car *****"); c1.Advise(sink); c1.Advise(myOtherSink); // Speed up (this will generate the events). Console.WriteLine("\n***** Speeding up *****"); for(int i = 0; i < 10; i++) c1.Accelerate(20); // Detach first sink from events. Console.WriteLine("\n***** Removing first sink *****"); c1.Unadvise(sink); // Speed up again (only myOtherSink will be called). Console.WriteLine("\n***** Speeding up again *****"); for(int i = 0; i < 10; i++) c1.Accelerate(20); // Detach other sink from events. Console.WriteLine("\n***** Removing second sink *****"); c1.Unadvise(myOtherSink); Console.ReadLine(); }

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static void Main(string[] args) { Console.WriteLine("***** Fun with StreamWriter / StreamReader *****\n"); // Get a StreamWriter and write string data. StreamWriter writer = File.CreateText("reminders.txt"); writer.WriteLine("Don't forget Mother's Day this year..."); writer.WriteLine("Don't forget Father's Day this year..."); writer.WriteLine("Don't forget these numbers:"); for(int i = 0; i < 10; i++) writer.Write(i + " "); // Insert a new line. writer.Write(writer.NewLine); // Closing automatically flushes! writer.Close(); Console.WriteLine("Created file and wrote some thoughts..."); } Once you run this program, you can examine the contents of this new file (see Figure 16-8).

Now you need to understand how to programmatically read data from a file using the corresponding StreamReader type. As you recall, this class derives from TextReader, which offers the functionality described in Table 16-8. Table 16-8. TextReader Core Members

Peek() Read() ReadBlock() ReadLine() ReadToEnd()

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Returns the next available character without actually changing the position of the reader. A value of 1 indicates you are at the end of the stream. Reads data from an input stream. Reads a maximum of count characters from the current stream and writes the data to a buffer, beginning at index. Reads a line of characters from the current stream and returns the data as a string (a null string indicates EOF). Reads all characters from the current position to the end of the stream and returns them as a single string.

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