Best Practices with the Microsoft Visual C# 3.0 Language Features with Mads Torgersen (PM for C#)

Automatically implemented properties

public string CustomerID { get; set; }

Implicitly typed Local variables

var custs = new List<Customer>()

{

new Customer()

{

                        CustomerID = “MADST”;

                        CustomerName = “Mads Torgersen”;

                        City = “Redmond”;

}

}

Collection and Object Initializers

Code-result Isomorphism

            Shape imitates result

ObjectDumper

Extension Methods

Public static IEnumerable<Customer> GetLondoners(this IEnumerable<Customer> source)

Foreach (var c in source)

{

            If (c.City == “London”) yield return c;

}
Allows you to insert extension methods into an instance (even if static)

New functionality on existing types

Scoped by using causes

Interfaces & constructed types

Lambda Expressions

Public static IEnumerable<T> Filter <T>(GetLondoners(this IEnumerable<T> source, Predicate>T> p)

foreach (var c in source)

{

            If (p(c)) yield return c;

}

var query customers.Filter(delegate(Customer c) { return c.City == “London”; };

Terse syntax for anonymous methods:

var query customers.Filter(c =>{ c.City == “London”;});

*When you only have one thing left you can remove the parens

LINQ to Objects

var query = Customers

            .Where( c=> c.City == “London”);

            .Select ( c=> c.ContactName);

ObjectDumper.Write(query);

Monads – Look into this

Don’t use LINQ for *other magic* that is not a query

Expression Trees

Related to link

Expression(of)

Represents a lambda expression as an expression tree at runtime

ASP.NET MVC with Scott Hanselman

• Separation of Concerns!
• A new .NET project type
• Designed to be very easily testable with minimal need for mocking objects compared with other patterns
• Test with mbunit or integrated VS test system
• Uses three new namespaces:
  • System.Web.Abstractions
  • System.Web.Mvc;
  • System.Web.Routing;
• "Bin-deployable" These new assemblies do not have to be installed in the GAC.  Useful when you can't, or are afraid to, install them there.
• Flexible.  Plays well with Winforms
• Fundamental to .NET from version 3.5 forward
• Demo of red-green TDD.  This is really quite easy with MVC because of much improved separation of concerns when used properly
• JQuery and AJAX compatible
• Dove into the call stack for MVC at runtime, it's quite informative for understanding what's going on "under the covers".  Have a look at the call stack of a running MVC app to get a good picture of what's going on.
• Discussion of Routing
• Provides for cleaner URLs and HTML
• Phil Haack (PM for MVC) is open to suggestions from the community and will be incorporating recommendations from developers as much as possible.
• "Strongly typed query strings"
• Much better than average runtime errors when something goes wrong.  This is strange but true!
• Discussed Extension Methods, Lambda queries, and LINQ