One interesting aspect of VB queries is that you can select multiple values. When you do this, the values get combined into an anonymous type. “Anonymous types” is a new feature for VB9. Essentially an anonymous type is a class that contains one or more...

This seems to be a common question - " I have a list of lists (or array or arrays), how can I flatten it into a single list/array? " It is surprisingly trivial to do with queries. It takes one line of code - Module Module1 Sub Main() 'create...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/06/07/query-pattern-composability-query-design-continued.aspx As you might have seen queries have a lot more...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/06/07/query-pattern-composability-query-design-continued.aspx Here is another important example of a queryable...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/06/08/generic-queryable-example-query-design-continued.aspx Here is one more example of a queryable type...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/06/07/query-pattern-composability-query-design-continued.aspx Here is another example of a queryable collection...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/02/19/polymorphic-selector-and-extension-methods-query-design-continued.aspx Here I want to summarize what...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/02/05/query-expression-query-design-continued.aspx So far we have followed design decisions for the language...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/01/30/representing-the-user-code-by-delegates-query-design-continued.aspx In the previous posts we have designed...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/01/22/generic-implementation-of-iterateandapply-query-design-continued.aspx Lets’ now consider the implementation...

This post is a part of a series of posts about query design. For the previous post see: http://blogs.msdn.com/vladimirsadov/archive/2007/01/14/reusability-is-the-reason-to-have-queries.aspx So far we have a pretty good implementation of IterateAndApply...

Programmers do not like writing the same code over and over again. There are many reasons for this. First of all it is not productive. Secondly it is often hard to maintain as similar code pieces often require same changes. Copying code within a big project...

Well, if you are using May CTP, then there is only one kind of Join operations that you can do in VB - cross-join. The syntax for performing cross-join of two collections follows: Dim arr1 = New Integer () {1, 2, 3} Dim arr2 = New String () { "Hi...

Well. The answer is no. CDATAs cannot be nested in general. The nested CDATA terminating sequence will terminate the outer CDATA. However there is a trick where you can put CDATA in two consequitive CDATA sections. It works by splitting the terminating...

You cannot declare a closure directly in VB right now, however in the last CTP verion of VB 9.0 you can create some closures indirectly using quries syntax. The following is by no means is an effective implementation of factorial function :-) , but...

I think the LINQ way is a way more expressive compared to the loops although conceptually they do the same thing. Function LINQ( ByVal arr1 As String (), ByVal arr2 As String ) As String () Dim duplicates = From s0 In arr1, s1 In arr2 _ ...

Well, that is how you may have no posts for long time.... :-)

As you may noticed from my previous post loader treats v1.0 and v1.1 managed executables as 32bit only regardless of the ILONLY flag. The main reason for this is that before v2.0 there was no way to express that an executeble has or does not have dependencies...

Just like other Windows executable files Managed code is stored in PE format. To be more precise it can use PE (32bit) or PE+ (64bit) formats. In unmanaged world the format of the executable tells the loader whether to run the image as 64 bit or 32...

Using is a very convenient language element. When I have to write something that should be compilable by older version of the compiler, "Using" is one of the new features that I really miss. Here is an example how to achieve the same behavior without...

So here is an example how you can create a Nullable(Of Nullable ...)) type via indirection if Nullable were allowed to be passed to an As Structure type argument: 'in ClassLibrary1.dll you have this: Public Class cls1( Of T As Structure ) Function...

Here is an interesting experiment: Class cls1( Of T As Structure ) End Class Module Module1 Sub Main() Dim v As cls1( Of Nullable( Of Integer )) End Sub End Module We all know that Nullable(Of T) is a structure. However the...

Q: A 32bit app, can run on a 64bit OS, so it must be able to access 64bit, right? So can a 32bit app access my 64bit library component/library/dll. Should I test this scenario? Short answer is “most likely no”, the long answer is: Communication between...

MSDN has started adding documentation about .Net on 64bit platforms. Here is the link: http://msdn.microsoft.com/netframework/programming/64bit/default.aspx Do not say you have not seen it. :-)

As I mentioned in my previous post when we install .Net framework on a 64bit machine we put both 32 bit and 64 bit runtimes on it. A reasonable question is “Why do we need 32 bit runtime on a 64 bit machine?”. The answer is “To enable your .Net app to...