Posts Tagged ‘vbnet’

VB.Net and lambda

November 30th, 2011

Using the terse lambda syntax used in C# also in VB.Net is also (almost) possible.

Here is a short example:

var nameList =
 myFacade.GetData().
 where( x => x.ID = 42 ).
 select( x => x.Name ).
 ToList();

which in VBNet becomes:

Dim nameList =
 myFacade.GetData().
 Where( Function(x) x.ID = 42 ).
 Select( Function(x) x.Name ).
 ToList()

Note that the periods have to be at the end of the line, otherwise the multi line capability of Vbnet doesn’t work.  This can be remedied by the old trailing underscore of VB.

If you need to set the type of x it is also doable:

Dim nameList =
 myFacade.GetData().
 Where( Function(x As MyClass) x.ID = 42 ).
 Select( Function(x As MyClass) x.Name ).
 ToList()
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