net 2.0 and visual studio 2005 sigwin 2004. outline language enhancements in c# language...

.NET 2.0 and Visual .NET 2.0 and Visual Studio 2005Studio 2005

SigWin 2004SigWin 2004

OutlineOutline

Language enhancements in C#Language enhancements in C#– GenericsGenerics– Partial typesPartial types– Anonymous methodsAnonymous methods– Nullable typesNullable types

IDE featuresIDE features– Intellisense Intellisense – RefractoringRefractoring– Code snippetsCode snippets– Other awesome stuff!Other awesome stuff!

GenericsGenerics

MotivationMotivation

GenericsGenerics

One method:One method:public int AddSeconds(ArrayList myList) {public int AddSeconds(ArrayList myList) {

int total=0;int total=0;DateTime myDate;DateTime myDate;foreach (object myObj in myList) {foreach (object myObj in myList) {

myDate=(DateTime) myObj;myDate=(DateTime) myObj;total+=myDate.Second;total+=myDate.Second;

}}return total;return total;

}}

GenericsGenerics

Other method is to derive your Other method is to derive your own collection class. Namespace own collection class. Namespace is now cluttered with many is now cluttered with many strongly typed collectionsstrongly typed collections

Answer to problem: GENERICS!!!!!Answer to problem: GENERICS!!!!!

Generics: ExampleGenerics: Example

System.Collections.Generic:System.Collections.Generic:

private System.Collections.Generic.List<DateTime> private System.Collections.Generic.List<DateTime> myList;myList;

private Dictionary<string, Stack<DateTime>> private Dictionary<string, Stack<DateTime>> myList;myList;

Generics: old exampleGenerics: old example

public int AddSeconds(List<DateTime> myList) { int total = 0; foreach (DateTime myDate in myList) total += myDate.Second; return total; }

Partial typesPartial types

Easy way to separate Easy way to separate automatically generated code automatically generated code from your own:from your own:

public partial class myClass {}public partial class myClass {}

public partial class myClass {}public partial class myClass {}

Anonymous methodsAnonymous methods

Review of delegatesReview of delegates Anonymous delegate=delegate Anonymous delegate=delegate

without a function name, just without a function name, just codecode

Anonymous method Anonymous method example:example:

button1.Click += delegate { MessageBox.Show("Click"); };

Alternative:

button1.Click+=new EventHandler(myButton1_Click);

private void myButton1_Click(object sender, EventArgs e) {

MessageBox.Show(“Click”);

}

Nullable typesNullable types

MotivationMotivation Syntax:Syntax:

int? myInt = null; if (myInt.HasValue) { //Do stuff here with myInt.Value } else { //It's null } int? d=1, f=null; Console.WriteLine(f ?? d);

Visual Studio 2005 IDEVisual Studio 2005 IDE

Demo!Demo!