New features and improvements in core framework are
- Ability to limit how long the regular expression engine will attempt to resolve a regular expression before it times out.
- Ability to define the culture for an application domain.
- Console support for Unicode (UTF-16) encoding.
- Support for versioning of cultural string ordering and comparison data.
- Better performance when retrieving resources.
- Zip compression improvements to reduce the size of a compressed file.
- Ability to customize a reflection context to override default reflection behavior through the CustomReflectionContext class.
- Managed Extensibility Framework
- Asynchronous File Operations
- Support for new HTML5 form types.
- Support for model binders in Web Forms. These let you bind data controls directly to data-access methods, and automatically convert user input to and from .NET Framework data types.
- Support for unobtrusive JavaScript in client-side validation scripts.
- Improved handling of client script through bundling and minification for improved page performance.
- Integrated encoding routines from the AntiXSS library (previously an external library) to protect from cross-site scripting attacks.
- Support for WebSockets protocol.
- Support for reading and writing HTTP requests and responses asynchronously.
- Support for asynchronous modules and handlers.
- Support for content distribution network (CDN) fallback in the ScriptManager control.
New Features in WCF 4.5 are
- Simplification of generated configuration files.
- Support for contract-first development.
- Ability to configure ASP.NET compatibility mode more easily.
- Changes in default transport property values to reduce the likelihood that you will have to set them.
- Updates to the XmlDictionaryReaderQuotas class to reduce the likelihood that you will have to manually configure quotas for XML dictionary readers.
- Validation of WCF configuration files by Visual Studio as part of the build process, so you can detect configuration errors before you run your application.
- New asynchronous streaming support.
- New HTTPS protocol mapping to make it easier to expose an endpoint over HTTPS with Internet Information Services (IIS).
- Ability to generate metadata in a single WSDL document by appending ?singleWSDL to the service URL.
- Websockets support to enable true bidirectional communication over ports 80 and 443 with performance characteristics similar to the TCP transport.
- Support for configuring services in code.
- XML Editor tooltips.
- ChannelFactory caching support.
- Binary encoder compression support
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