O'Reilly C# 5.0 in a Nutshell, 5th Edition 9781449320102 Manual Do Utilizador
Códigos do produto
9781449320102
What distinguishes WinRT from ordinary COM is that WinRT projects its libraries
into a multitude of languages, namely C#, VB, C++ and JavaScript, so that each
language sees WinRT types (almost) as though they were written especially for it.
For example, WinRT will adapt capitalization rules to suit the standards of the target
language, and will even remap some functions and interfaces. WinRT assemblies
also ship with rich metadata in .winmd files which have the same format as .NET
assembly files, allowing transparent consumption without special ritual. In fact, you
might even be unaware that you’re using WinRT rather than .NET types, aside of
namespace differences. (Another clue is that WinRT types are subject to COM-style
restrictions; for instance, they offer limited support for inheritance and generics.)
into a multitude of languages, namely C#, VB, C++ and JavaScript, so that each
language sees WinRT types (almost) as though they were written especially for it.
For example, WinRT will adapt capitalization rules to suit the standards of the target
language, and will even remap some functions and interfaces. WinRT assemblies
also ship with rich metadata in .winmd files which have the same format as .NET
assembly files, allowing transparent consumption without special ritual. In fact, you
might even be unaware that you’re using WinRT rather than .NET types, aside of
namespace differences. (Another clue is that WinRT types are subject to COM-style
restrictions; for instance, they offer limited support for inheritance and generics.)
WinRT/Metro does not supersede the full .NET Framework.
The latter is still recommended (and necessary) for standard
desktop and server-side development, and has the following
advantages:
The latter is still recommended (and necessary) for standard
desktop and server-side development, and has the following
advantages:
• Programs are not restricted to running in a sandbox.
• Programs can use the entire .NET Framework and any
• Programs can use the entire .NET Framework and any
third-party library.
• Application distribution does not rely on the Windows
Store.
• Applications can target the latest Framework version
without requiring users to have the latest OS version.
What’s New in C# 5.0
C# 5.0’s big new feature is support for asynchronous functions via two new
keywords,
keywords,
async
and
await
. Asynchronous functions enable asynchronous continu-
ations, which make it easier to write responsive and thread-safe rich-client applica-
tions. They also make it easy to write highly concurrent and efficient I/O-bound
applications that don’t tie up a thread resource per operation.
tions. They also make it easy to write highly concurrent and efficient I/O-bound
applications that don’t tie up a thread resource per operation.
.
What’s New in C# 4.0
The features new to C# 4.0 were:
• Dynamic binding
• Optional parameters and named arguments
• Type variance with generic interfaces and delegates
• COM interoperability improvements
• Optional parameters and named arguments
• Type variance with generic interfaces and delegates
• COM interoperability improvements
Dynamic binding (Chapters
) defers binding—the process of resolving types
and members—from compile time to runtime and is useful in scenarios that would
otherwise require complicated reflection code. Dynamic binding is also useful when
interoperating with dynamic languages and COM components.
otherwise require complicated reflection code. Dynamic binding is also useful when
interoperating with dynamic languages and COM components.
6 | Chapter 1:
Introducing C# and the .NET Framework