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There has been quite a bit of talk in the software community about convention over configuration. Most of this talk began in earnest with the development of Ruby on Rails (http:// www.rubyonrails.org/). Ruby on Rails (Rails for short) is an amazing tool that allows people to very quickly create effective web sites that provide useful functionality. Most developers would love to get their jobs done more quickly, and Rails offers a way to do just that. Many attribute the success of Rails to its use of convention over configuration. Some say it is the Ruby language. Others say it is because Rails is a professional product. I believe it s a combination of factors, but the convention over configuration angle does play an important role. Let s go back to the problem of loading code dynamically, or for that matter, executing code dynamically. How much do you expect the programmer to know, and how much do you expect the programmer to guess Consider this code:

// Update the quantity of a shopping cart item public static bool UpdateItem(string productId, int quantity) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "ShoppingCartUpdateItem"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CartID"; param.Value = shoppingCartId; param.DbType = DbType.String; param.Size = 36; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductID"; param.Value = productId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@Quantity"; param.Value = quantity; param.DbType = DbType.Int32; comm.Parameters.Add(param); // returns true in case of success and false in case of an error try { // execute the stored procedure and return true if it executes // successfully, and false otherwise return (GenericDataAccess.ExecuteNonQuery(comm) != -1); } catch { // prevent the exception from propagating, but return false to // signal the error return false; } }

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Since the beginning of C#, there has been a concept called a delegate. A delegate is a method without a type. For example, consider the following type definition. interface IExample { void Method(); } If the interface were converted into a delegate, it would look like this: delegate void Method();

Now add the RemoveItem method, which causes the removal of one product from the customer s shopping cart:

A delegate and interface share the same role, in that they are types without implementations and are used to build components. An interface can have multiple methods and properties. A delegate is a method declaration and can define only the parameters and return types. The purpose of delegates is to be able to define a generic method-calling mechanism without needing to add the baggage of implementing an interface. The approach used in the delegate solution to the problem presented in the previous section is to define a chunk of functionality that performs the iteration, called an iterator. And then to do something with the iteration, another chunk of functionality is integrated via a delegate. The result is that you have two separate pieces of functionality that are integrated using a component methodology. Following is the complete rewritten foreach code that uses delegates. public delegate void ProcessValue(int value); public static class Extensions { public static void Iterate(this ICollection<int> collection, ProcessValue cb) { foreach (int element in collection) { cb(element); } } } static class Tests { static int _runningTotal; static void ProcessRunningTotal(int value) { _runningTotal += value; } static int _maxValue; static void ProcessMaximumValue(int value) { if (value > _maxValue) { _maxValue = value; } } static void DoRunningTotalAndMaximum() { List<int> lst = new List<int> { 1, 2, 3, 4 }; _runningTotal = 0; lst.Iterate(new ProcessValue(ProcessRunningTotal)); Console.WriteLine("Running total is (" + _runningTotal + ")"); _maxValue = int.MinValue; lst.Iterate(new ProcessValue(ProcessMaximumValue)); Console.WriteLine("Maximum value is (" + _maxValue + ")"); }

// Remove a shopping cart item public static bool RemoveItem(string productId) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "ShoppingCartRemoveItem"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CartID"; param.Value = shoppingCartId; param.DbType = DbType.String; param.Size = 36; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductID"; param.Value = productId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // returns true in case of success and false in case of an error try { // execute the stored procedure and return true if it executes // successfully, and false otherwise return (GenericDataAccess.ExecuteNonQuery(comm) != -1); } catch { // prevent the exception from propagating, but return false to // signal the error return false; } }

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