Some features of c#2.0 to 4.0

List lists for future reference

First, c#2.0

1. Partial class Partial classes

File1.cs

using System;  Public Partial class myclass{    publicvoid  MyMethod1 ()    {        Console.WriteLine (  "MyMethod1 manually written code ");}    }

File2.cs

using System;  Public Partial class myclass{    publicvoid  MyMethod2 ()    {        Console.WriteLine ("  MyMethod2 are usually automatically generated code, such as WebService ");}    }

Compile:

Csc/out: Lib  . dll/t: library File1.cs  file2. /out: App. exe/r: lib. dll App.cs

2. Generics generics

3. Static Class Classes

There can be no instance method in a static class, no instance constructor, and a static constructor, similar to the function of module in the process language

using System;  Public Static class utilityclass{    publicstaticvoid  Foo ()    {        Console.WriteLine ("Hello");    }            }

using System; class app{    staticvoid  Main ()    {        utilityclass.foo ();}    }

You can see that the static class is not an instance constructor.

A non-static class is one that has an instance constructor.

4. Iterator iterators

5. Anomymous Methods anonymous method

6. Nullable Types Nullable type

7.?? Operator

Object NULL  Objectnewreturn//  returns obj

Second, C # 3.0

1. LINQ (language-integrated query)

2. Object initializers Objects initializer

3. Colletion initializers Set initializer

4. Anomymous types Anonymous type (var)

5. Lambda Expressions lambda expression

6. Automatic Properties Auto-complete Property

7. Extension Methods Extension method

Third, C # 4.0

1. Optional parameters and named arguments optional parameters and named parameters

Iv. references

C # 2.0:msdn Wikipedia

C # 3.0:msdn Wikipedia

C # 4.0:msdn Wikipedia What's New on C # 4.0

Not finished

Some features of c#2.0 to 4.0