2009-05-09
2009-05-07
The C# Programming Language Version 4.0
The major theme for C# 4.0 is dynamic programming. Increasingly, objects are “dynamic” in the sense that their structure and behavior is not captured by a static type, or at least not one that the compiler knows about when compiling your program.
The new features in C# 4.0 fall into four groups:
Dynamic lookup
Dynamic lookup allows you to write method, operator and indexer calls, property and field accesses, and even object invocations which bypass the C# static type checking and instead gets resolved at runtime.
Named and optional parameters
Parameters in C# can now be specified as optional by providing a default value for them in a member declaration. When the member is invoked, optional arguments can be omitted. Furthermore, any argument can be passed by parameter name instead of position.
COM specific interop features
Dynamic lookup as well as named and optional parameters both help making programming against COM less painful than today. On top of that, however, we are adding a number of other small features that further improve the interop experience.
Variance
It used to be that an IEnumerable wasn’t an IEnumerable. Now it is – C# embraces type safe “co-and contravariance” and common BCL types are updated to take advantage of that.
Resources
All available resources concerning C# 4.0 can be accessed through the C# Dev Center at www.csharp.net. Specifically, this white paper and other resources can be found at the Code Gallery site code.msdn.com/csharpfuture.
The new features in C# 4.0 fall into four groups:
Dynamic lookup
Dynamic lookup allows you to write method, operator and indexer calls, property and field accesses, and even object invocations which bypass the C# static type checking and instead gets resolved at runtime.
Named and optional parameters
Parameters in C# can now be specified as optional by providing a default value for them in a member declaration. When the member is invoked, optional arguments can be omitted. Furthermore, any argument can be passed by parameter name instead of position.
COM specific interop features
Dynamic lookup as well as named and optional parameters both help making programming against COM less painful than today. On top of that, however, we are adding a number of other small features that further improve the interop experience.
Variance
It used to be that an IEnumerable
Resources
All available resources concerning C# 4.0 can be accessed through the C# Dev Center at www.csharp.net. Specifically, this white paper and other resources can be found at the Code Gallery site code.msdn.com/csharpfuture.
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