Visual Basic Complier and Language

Auto-Implemented Properties

Auto-implemented properties provide a shortened syntax that enables you to quickly specify a property of a class without having to write code to Get and Set the property.

Collection Initializers

Collection initializers provide a shortened syntax that enables you to create a collection and populate it with an initial set of values. Collection initializers are useful when you are creating a collection from a set of known values, for example, a list of menu options or categories.

Implicit Line Continuation

In many cases, implicit line continuation enables you to continue a statement on the next consecutive line without using the underscore character (_).

Multiline Lambda Expressions and Subroutines

Lambda expression support has been expanded to support subroutines in addition to multiline lambda functions and subroutines.

New Command-Line Option for Specifying a Language Version

The /langversion command-line option causes the compiler to accept only syntax that is valid in the specified version of Visual Basic.

Type Equivalence Support

You can now deploy an application that has embedded type information instead of type information that is imported from a Primary Interop Assembly (PIA). With embedded type information, your application can use types in a runtime without requiring a reference to the runtime assembly. If various versions of the runtime assembly are published, the application that contains the embedded type information can work with the various versions without having to be recompiled.

Dynamic Support

Visual Basic binds to objects from dynamic languages such as IronPython and IronRuby.

Covariance and Contravariance

Covariance enables you to use a more derived type than that specified by the generic parameter, whereas contravariance enables you to use a less derived type. This allows for implicit conversion of classes that implement variant interfaces and provides more flexibility for matching method signatures with variant delegate types. You can create variant interfaces and delegates by using the new In and Out language keywords. The .NET Framework also introduces variance support for several existing generic interfaces and delegates, including the IEnumerable<(Of <(T>)>) interface and the Func<(Of <(TResult>)>) and Action<(Of <(T>)>) delegates.

Integrated Development Environment

Navigate to

You can use the Navigate To feature to search for a symbol or file in source code. You can search for keywords that are contained in a symbol by using Camel casing and underscore characters to divide the symbol into keywords.

Highlighting References

When you click a symbol in source code, all instances of that symbol are highlighted in the document.

For many control structures, when you click a keyword, all of the keywords in the structure are highlighted. For instance, when you click If in an If...Then...Else construction, all instances of If, Then, ElseIf, Else, and End If in the construction are highlighted.

To move to the next or previous highlighted symbol, you can use CTRL+SHIFT+DOWN ARROW or CTRL+SHIFT+UP ARROW.

Generate from Usage

The Generate From Usage feature enables you to use classes and members before you define them. You can generate a stub for any class, constructor, method, property, field, or enum that you want to use but have not yet defined. You can generate new types and members without leaving your current location in code. This minimizes interruption to your workflow.

Generate From Usage supports programming styles such as test-first development.

IntelliSense Suggestion Mode

IntelliSense now provides two alternatives for IntelliSense statement completion: completion mode and suggestion mode. Suggestion mode is used when classes and members are used before they are defined.

Sample Application

Visual Basic includes new sample applications that demonstrate the following features: auto-implemented properties, implicit line continuation, collection initializers, covariance and contravariance, and multiline lambda expressions and subroutines.

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