Misc Changes in Visual Basic .NET

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Misc Changes
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What follows are a number of other enhancements that have been introduced in WCF4.
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Improved Integration with WF
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Microsoft has put a big focus on improving the integration between WF and WCF, and this release sees the introduction of a new project type called WF Service (a combined WCF and WF service represented entirely in XAML). Please refer to 6 for full details.
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Default Performance-Related Settings Changed
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A number of default settings for WCF services have been tweaked for better performance: MaxConcurrentSessions was 10, and is now 100 x processor count. MaxConcurrentCalls was 16, and is now 16 x processor count. MaxConcurrentInstances was 26, and is now the total of MaxConcurrentSettions and MaxConcurrentCalls.
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A new minFreeMemoryToActivateService option has been added that defines the percentage of memory that needs to be free in order for a service to be activated (defaulted to 5%). If less than the specified memory is available then WCF will throw an exception.
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Other changes
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The following lists some other changes that have been made. Event Tracing for Windows is now used for tracing offering better performance. There s a new DataContractResolver class that allows control over the serialization process of types (http://msdn.microsoft.com/en-us/library/system.runtime. serialization.datacontractresolver(VS.100).aspx). There s a new byte stream encoder (a new encoder for sending binary content over WCF see samples again). Automatic decompression over HTTP for client has been added (server not currently supported). Extended protection of secure channels has been added (a new Windows feature that binds one security system to another making attacks harder). The addition of non-destructive queue receive (an alternative way of processing messages that makes a queue item invisible to other consumers and creates a transaction for performing work on it that if rolled back will return the item to its place on the queue for more info please refer to: http://blogs.msdn.com/drnick/ archive/2008/12/04/an-alternative-queuing-model.aspx).
Dublin/Windows Application Server
It is important to note that Microsoft are working on a new technology code named Dublin (which will probably become Windows Application Server when the marketing guys get their way) that aims to make it easy to deploy and manage your WCF and WF applications and services and will probably become the preferred means of hosting services. At the time of writing Dublin will ship as an add-in to Windows Server 2008 and will be contained in future versions of Windows as part of the application server role. Dublin is an extension to IIS and Microsoft say will provide the following functionality: Allows easier deployment of workflow and services. Provides an overview of service health and dashboard for monitoring services. Has tools for easier management of services. Comes with forwarding/routing functionality. Has built-in tracking profiles for monitoring common events.
Further reading
http://msdn.microsoft.com/en-gb/library/dd456789(VS.100).aspx http://blogs.thinktecture.com/cweyer/default.aspx http://msdn.microsoft.com/en-us/library/ee354381.aspx http://blogs.msdn.com/drnick/ http://blogs.msdn.com/endpoint/ http://msdn.microsoft.com/en-us/netframework/aa663324.aspx
Entity Framework
Entity Framework (EF) is Microsoft s Object Relational Mapping (ORM) solution and was first released with .NET 3.5SP1. Entity Framework received much criticism when it was first released and the team at Microsoft has been hard at work to address some of these criticisms in the latest version.
WARNING This chapter is written using a preview version of EF4, so final functionality may differ. It is also worth noting that EF is likely to have releases out of band. For the examples in this chapter you will need to install the EF CTP 2.
EF and LINQ to SQL
Some developers are understandably confused by the overlap between EF and LINQ to SQL. EF and LINQ to SQL were developed by two different teams hence the overlap. LINQ to SQL is a great piece of technology and very suitable as a simple, light-weight wrapper to SQL. It is pretty clear, however, that Microsoft is pushing developers to use EF. This is a sensible (although no doubt irritating) move as LINQ to SQL is fundamentally flawed as a generic ORM solution in that It only works with SQL Server. Generated classes must have a 1 to 1 relationship with database objects.
EF provides an abstraction above the database layer and a number of enhancements that make it superior to LINQ to SQL.
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