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  1. Duck typing of interfaces

    One of the features that was dropped from VB9 was dynamic interfaces:
    http://download.microsoft.com/download/5/8/4/5841bc1a-e864-4423-bb75-d4f3c18c0af5/visual%20basic%209.0%20overview.doc

    Any chance of bringing this back? I know it can be done at runtime:
    http://www.codeproject.com/Articles/16074/DuckTyping-Runtime-Dynamic-Interface-Implementatio

    But that looses the compile time type checking, which is the great advantage of dynamic interfaces -- it gives you the best of both worlds, you can define a set of behavior for an existing class without having to have control over that class, based upon it's public interface, with no chance of it failing because of a missing property or method (if the class doesn't meet the requirements for the interface,…

    20 votes
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      1 comment  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
    • Add null-propagating member-access operator (?.) to VB.NET

      I've heard a similar feature is possibly in the pipeline for C#, and would love to see it in VB.NET as well. I'd love to reduce:

      If points IsNot Nothing Then
      Dim next = points.FirstOrDefault
      If next IsNot Nothing AndAlso next.X IsNot Nothing Then
      Return next.X
      End If
      End If
      Return -1

      ...to:

      Return If(points?.FirstOrDefault()?.X, -1)

      18 votes
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        1 comment  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →

        Hey Mike,

        We’ve gotten a tremendous amount of feedback from users that this feature would be valuable. We’d really like to do it in the next version and are fleshing out the design now. It’s a feature that we’d do for both VB and C# at the same time.

        At the moment the most commonly imagined syntax is ‘?.’ well technically the operator itself is just ? and it modifies whatever comes after so all of these cases would potentially result in null if the expression to the left of the ? is null:

        ’ Null-propagating member-access.
        list?.Member

        ’ Null-propagating object index or delegate invocation.
        list?(0)

        ’ Null-propagating dictionary-access.
        list?!key

        ’ Null-propagating XML element-, attribute-, and descendent-access.
        list?.
        list?.@attribute
        list?…

        (for C# we’d also need to consider ?→ for null-propagating pointer dereference)

        The design seems mostly straight-forward though we still need to think about possible interactions with the Await operator…

      • Unused procedures vanish automatically on compile.

        When I compile or debug the program I want all unused procedures to vanish automatically. (example: Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged End Sub should vanish when debug/compile if no code is inside it.)
        This worked in VB6.

        18 votes
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          10 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
        • Make the Optional keyword optional

          Please allow

          Private Sub Test(s As String = 1)

          as in C# besides the current version:

          Private Sub Test(Optional s As String = 1)

          This removes redundancies (--> improves readability, accelerates writing code) and drives forward the co-evolution of VB/C#. I don't see any reason not to allow this.

          17 votes
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            4 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
          • Using logical And operator in the Select Case statement

            Select Case dblA
            ....Case Is > 1.22 And Is < 3.4

            ....Case Is > 4.1

            ....Case Else

            End Select

            Select Case sProductName
            ....Case Is > sPrevProdName And Is Like "* tea *"

            ....Case "apple juice"

            End Select

            15 votes
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              5 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →

              Hey everyone,

              If you hadn’t heard already last week at BUILD we announced the PUBLIC release of a Preview of the next version of the Visual Basic language and code editing experience powered by “Roslyn”. You can download this preview and install it on top of Visual Studio 2013 today!

              I’m excited to let you know that included in this is a preview of a new language feature we’re considering: When clauses on Case statements. This behaves like an AND. It doesn’t do exactly as suggested because you can’t implicitly refer to the Select Case expression but you can test other conditions inside:

              Select Case dblA
              Case Is > 1.22 When Date.Today.DayOfWeek = DayOfWeek.Monday
              ’ Why would anyone ever write this?
              End Select

              You can read about it more here: http://www.codeplex.com/Download?ProjectName=roslyn&DownloadId=824695

              Download the End User Preview @ http://msdn.microsoft.com/en-US/vstudio/roslyn

              I encourage you all to download it, try it out, and…

            • Allow Unsafe Code and Pointers in VB.

              Make it so pointers can be cast in unsafe contexts for complex interop coding ...

              Public Unsafe Function x(y as SomeStruct) As ResultStruct
              Dim p As Object? ' use Object? as an alternative to (void *)
              p = InteropCall(y?) ' use ? to get the address of something.
              Return CType(@p, ResultStruct) ' use @ to dereference.
              End Function

              15 votes
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                2 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
              • Add NotifyPropertyChanged attribute (or keyword) to properties declared as auto-implemented properties

                I absolutely love using auto-implemented properties and the removal of the need to declare a backing variable.

                Public Property MyProperty As String

                However, for classes that implement INotifyPropertyChanged, I can't use auto-implemented properties, and instead have to write the more verbose:

                Private _myProperty As String
                Public Property MyProperty As String
                Get
                Return _myProperty
                End Get
                Set(value As String)
                _myProperty = value
                RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("MyProperty"))
                End Set
                End Property

                Multiply this by a few dozen properties, and this gets a little tedious (even with code snippets), much too verbose to read, and increases the surface area for typo bugs.

                I…

                15 votes
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                  1 comment  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                • Add IntelliSense for XML Literals based on Imported xmlns

                  The current feature that allows you to import an xmlns gives IntelliSense only when consuming XML via XElement or XDocument objects. You can type .< or .@ or ...< after an objcect of type XElement or XDocument and get IntelliSense for the available element and attribute names based on the XML Namespace.

                  I've spoken at several user groups and code camps on this subject and the next thing that everyone wants to do is to get IntelliSense when composing XML Literals, but that's not currently available.

                  Even if you have an xmlns imported and type something like the following, you…

                  14 votes
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                    0 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                  • enable line comments in VB after the line continuation char (_)

                    Just a very simple thing:

                    I had an attribute and a field written on two lines like this:

                    <DebuggerBrowsable(DebuggerBrowsableState.Never)> _
                    Private _SomeField As String

                    and wanted to add a line comment after the '_':

                    ...State.Never)> _ 'My reason why

                    I now get the following error: "Line continuation character '_' must be preceded by at least one white space and must be the last character on the line."

                    My request now is to change the rule "...must be the last character on the line" to "...must be the last non-white-space character on that part of the line that does not belong…

                    14 votes
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                      1 comment  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →

                      Hey Chris,

                      Excellent suggestion! When we introduced implicit line-continuation in VB2010 it was a very painful restriction that we had to leave in due to technical and schedule constrains that comments weren’t allowed after them. Happily, thanks to the improved parser architecture we use in Roslyn (a future version of VB/C#) we will be able to support it one day. In fact, in the Roslyn compilers comments are already supported after implicit line-continuation so I can write this:

                      ’ Comment here

                      Private _SomeField As String

                      After we got that working it seemed reasonable to lift the restriction on normal, explicit line-continuation as well though we haven’t yet done so.

                      While we do not currently have plans to address this issue in the next release of Visual Studio, we are reviewing suggestions now for future versions of VB in and beyond the Roslyn time-frame. We have not determined when that will…

                    • Windows Phone 7 Training Kit for Developers

                      VB code examples in the hands-on-labs (solutions and lab manuals).

                      Windows Phone 7 Training Kit for Developers - RTM Refresh: http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=ca23285f-bab8-47fa-b364-11553e076a9a

                      14 votes
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                        0 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                      • [Planned] Make 'References' node visible in VB projects in Solution Explorer (like C#)

                        In C#, references are visible in Solution Explorer/Navigator. In VB you have to hide invisibles to achieve this.

                        14 votes
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                          0 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →

                          Good news everyone!

                          We’ve fix this for Visual Studio “14” and verified that the node is visible on our internal builds. I’ll update this suggestion when you can see the change in a public release.

                          Regards,

                          Anthony D. Green, Program Manager, Visual Basic & C# Languages Team

                        • Add some Tutorial Projects

                          Add some tutorial projects for those poeple who are new to vb.net/2011 get to know what it is and how it works n stuff encouraging them to get into programming and explore new ideas also making the process user friendly. The easiest way to do this by using sample projects like "HelloWorld" and implementing into vb as a tutorial project with basic fucktion like If Fucntions , Select Case and loop functions etc... basically Add more of some practical related tutorials :)

                          14 votes
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                            0 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                          • Add new operator (&_) to insert vbCrLf between concatenated strings

                            A line such as the following is tedious to write, and not so easy to read:

                            txtAll.Text = strPrompt & vbCrLf & strInfo1 & vbCrLf & strInfo2

                            I would love to see:

                            txtAll.Text = strPrompt &_ strInfo1 &_ strInfo2

                            11 votes
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                              4 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                            • One Line Initialization

                              I have a suggestion for a possible syntax improvement in visual basic.net. It's towards the initialization portion of a one line multiple declaration. Here is an example:

                              'Syntax:
                              Dim a, b, c As Integer = 5

                              'Output:
                              'a = 5
                              'b = 5
                              'c = 5

                              Attached is a file of an example where I would want to use a one line initialization. Take a look at the test scores(test1, test2, test3). An easier way to declare those would be:

                              Dim test1, test2, test3 As Double = -1

                              11 votes
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                                0 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                              • Do Not Collapse Comments

                                It would be nice if the comments simply did not collapse with CTRL+M+O. That or if there is a blank space between two blocks of comments. Do not treat them as 1. But instead it will collapse the entire section even though comments may not be a part of the one above it (obv limitation of VB because they do not have multi-line comments). I'm sure if we could just have a more robust commenting system. Things would have been peachy and I may not have switched to C#.
                                This should be simple, and to me already done as the…

                                10 votes
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                                  1 comment  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                                • Allow the subject of a With block to be referenced in the block using a new keyword WithRef

                                  Primarily, this is a convenience mechanism to avoid having to declare a variable in certain cases.

                                  Proposed:

                                  Function ReturnNewCheese(cheeseType as CheeseEnum) as Cheese
                                  With New Cheese
                                  .CheeseType = cheeseType 'property
                                  .Curdle 'method
                                  Helpers.DoSomethingWithCheese(WithRef)
                                  Return WithRef
                                  End With
                                  Exit Function

                                  Now:

                                  Function ReturnNewCheese(cheeseType as CheeseEnum) as Cheese
                                  Dim x as New Cheese
                                  With x
                                  .CheeseType = cheeseType
                                  .Curdle
                                  Helpers.DoSomethingWithCheese(x) 'requires explicit variable declaration
                                  End With
                                  Return x 'requires explicit variable declaration
                                  Exit Function

                                  10 votes
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                                    under review  ·  5 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Provide code in vb and c#

                                    Microsoft keeps saying they will continue to support Visual Basic, yet everywhere I look I see code examples and sample programs only provided in C#.

                                    The Microsoft Developer Network provides the option to view different languages, so there must be people at Microsoft who can translate the code.

                                    Whilst I don't expect every Microsoft blogger to provide samples in multiple languages, sites like www.asp.net with it's learn section should provide at least VB and C#.

                                    9 votes
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                                      0 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Fix opcodes from vb compiler when initialize an array and function local variant

                                      Hi guys,

                                      I want to point out some flaw opcodes that vb compiler create and hope VB dev team have sometime to fix those and make VB better performance.

                                      1. Array

                                      When I create an array like this "Dim Data(input.Length - 1) As Char", compiler will rewrite to "Dim Data(input.Length - 1 + 1) As Char"; it's unnecessary 4 bytes and you loss 4 of 64 bytes if you aim to create a tiny method.

                                      2. Function local variant

                                      VB function away has self local variant like "Function foo() As string" will have "Dim foo As String" even it's unused…

                                      9 votes
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                                        1 comment  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                                      • 9 votes
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                                          10 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Add to Visual Basic the ability to declare a new strong type in terms of another type

                                          Many other languages have 'strong' typing. Java, C#, and VB have strong typing regarding classes, but not for the primitive numeric types. It can be a great aid to making large-scale industrial and commercial software. For example, if one could declare two different types Apples and Oranges:

                                          Type Apples Is New Integer
                                          Type Oranges Is New Integer
                                          ...
                                          Dim A As Apples = 3
                                          Dim B As Oranges = 4

                                          then accidentally mixing arithmetic or assignment between these types would be prevented by the compiler, e.g. the assignment:

                                          A = B

                                          would be rejected by the compiler (and Intellisense) as…

                                          9 votes
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                                            4 comments  ·  Languages - Visual Basic  ·  Flag idea as inappropriate…  ·  Admin →
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