C# - Could .NET Be Parsed And Evaluated At Runtime

Nov 30, 2011

I thought it would be fun if I could write vb.net or c# code at runtime and the interpreter would automatically parse it like python does it, so I made a little program, which would do something similar. Basically it looks like this:

InputArgs = Console.ReadLine()
ParseInput(InputArgs.Split(" "))
Private Sub ParseInput(Args as List(Of String), Optional TempArgs as List(Of String))

[Code].....

I know it's not a good system, but it show's the basics. So my question is: Is it possible to make vb.net or c# like python - interpreted at runtime?

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Autogenerate/compile Code On-the-fly At Runtime Based Upon Values (like Key/value Pairs) Parsed Out Of A Configuration File?

Jan 2, 2011

I have a set of classes that mimics enums (see my other questions for specific details/examples). For 90% of my project, I can compile everything in at design time. But the remaining 10% is going to need to be editable w/o re-compiling the project in VS 2010. This remaining 10% will be based on a templated version of my Enums class, but will generate code at runtime, based upon data values sourced in from external configuration files.what my Enums class looks like. The templated fields, per that question, will be the MaxEnums Int32, Names String() array, and Values array, plus each shared implementation of the Enums sub-class (which themselves, represent the Enums that I use elsewhere in my code).I'd like to parse values from a simple text file (INI-style) of key/value pairs:

[Section1]
Enum1=enum_one
Enum2=enum_two
Enum3=enum_three

So that the following code would be generated (and compiled) at runtime (comments/supporting code stripped to reduce question size):

Friend Shared ReadOnly MaxEnums As Int32 = 3
Private Shared ReadOnly _Names As String() = New String() _
{"enum_one", "enum_two", "enum_three"}

[code]....

I'm certain this would need to be generated in MSIL code, and I know from reading that the two components to look at are CodeDom and Reflection.Emit, but I was wondering if anyone had working examples (or pointers to working examples) versus really long articles. I'm a hands-on learner, so I have to have example code to play with.

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Dec 20, 2011

The code line on where this is happening is on the response.redirect below:
Catch exR As System.NullReferenceException
Dim dt As CustomDataObject = New CustomDataObject("SP_Retrieve_LoginPort")
Dim port As Integer = dt.getdatatable.Rows(0).Item("Port")
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I get the following in my Request URL:
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Where does the copyright symbol come from?

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I am on a new topic in VB.NET and I am so confused I don't really even know where to start. It is sending Parsed Packets. This packet below is a login server of a game and I want to know how to send it so it automatically does it.[code]....

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[Code]...

Q:how to get the sql statement after sqlcmd parsed the parameters ?

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When i parse text from a website ( Such as a description of something ) and it has symbols in it such as

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[Code]...

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In the following
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I am trying to use AJAX UpdateProgress to display the loading image when the zip file is being created but get the following error:

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Detals: Error parsing near 'PK'.

Below is the code for my .aspx page

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">

[code]....

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Apr 18, 2012

I parse a date that is in string format and would like to convert it to a datetime format but cannot figure out how to do this.The date appears as such;Wed April 18 08:00:04 +08:00 2012and would like it in a simple form of 2012-04-18 08:00:00

Code:
Dim postDate As DateTime
Dim provider As CultureInfo = CultureInfo.InvariantCulture

[code].....

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Jan 1, 2010

What i'm trying to do is retrieve 2-3 pieces of information from a parsed html file, then add the data into a listview in the corresponding columns i was initially going to do a function for each piece of information to retrieve but thought maybe i could do it all with 1 function instead.

[Code]...

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VS 2008 Listbox Items - Information Parsed To Another Form

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I have some info in a listbox on another form. I want that information parsed to another form, and I would like to, for how ever many items there are in a listbox, create a button for every item and obviously parse the name to another label. I guess I would do this via an array.

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'If' Statement With 'Or' Conditional Has Both Sides Evaluated?

Jan 18, 2011

Quick question, of which the quickest and easiest answer may well be to rearrange related code, but let's see...So I have an If statement (a piece of code which is a part of a full working solution written in C#) rewritten using VB.NET. I am aware the VB.NET IIf(a, b, c) method evaluates both b and a regardless of the trueness of the first evaluation, but this seems to be the case in my standard construct, too:

If (example Is Nothing Or example.Item IsNot compare.Item) Then
'Proceed
End If

[code].....

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May 28, 2012

Is there a way to change when an expression in a datacolumn is evaluated?

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Access Of Shared Member ... Qualifying Expression May Not Be Evaluated

Jun 22, 2010

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[Code]....

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Mar 26, 2010

How can I get the variable My.Application.Info.Version.ToString to populate in the comments section?[code]..

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syntax: lblMessage.ForeColor = Me.f_Color.FromArgb(ds.Tables("Events").Rows(MNo).Item("Color"))

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Jan 8, 2011

I use .Net 2.0 on this one and i have a warning , i noticed that it runs over a line , here's the code:

Dim i = 0, y = 10
For i = 1 To 5
y = y + 100
Dim pic2 As New PictureBox

[code]....

'Warning 1 Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.

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Jan 20, 2012

I have a class with a static list of keys, and I have a static method called Remove() that removes a key from that list.Now what I understand from the contracts post conditions is that as the programmer of the class, I guarantee that the current public method does something specific, in this case : removing the element of the list.

Here's what I've written:

private static List<Keys> m_usedKeys; // private list of keys
public static void Remove(Keys _key)
{

[code]....

What I'm trying to "Ensure" here, is that the Remove() method removes the key for real from the list (Yes this might be a trivial example, but I get the error there.)when I write the Contract.Ensures() line, VS2010 gives me the following error :

Error 3 Detected expression statement evaluated for potential side-effect in contracts of method 'LibJungleTimer.KeyBind.Remove(System.Windows.Forms.Keys)'. (Did you mean to put the expression into a Requires, Ensures, or Invariant call?) C:UsersJoelDocumentsProgrammationJTJungleTimerLibJungleTimerKeyBind.cs 51

I think this error says that the expression m_usedKeys.remove(_key); has a potential side-effect. In fact, it has a side-effect, it removes a key from the list!If I try to write something like this instead :

Contract.Assert(!m_usedKeys.Any(x => x == _key));

well it compiles fine.

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Evaluated.LoadContainer.Load(Page Page, HtmlDocument HtmlDoc)?

Jan 5, 2011

I have a page to which i send some variables with the GET method. In my VB back-end i get those variables using Page.Request.QueryString("<name>")If i then use the IsNumeric method to make shure it is an numeric string i get True back as value.

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[Code]...

IsNumeric confirms that it is a numeric string and that it should be convertable to an Integer. So why won't it work. I don't think that my code should provide any extra information because it only gets the querystrings, uses IsNumeric and then tries to convert them.

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Access Of Shared Member, Constant Member, Enum Memberor Nested Type Through An Instance; Qualifying Expression Will Not Be Evaluated?

Jun 23, 2009

i changed a class variable to shared so i can access it in all instances of the class, but it caused an error. what is causing this, and how can i fix it?

Private
Shared img As Bitmap
Me
.img = bgImage

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Both "sides" Are Evaluated Situations Should Watch Out For?

Aug 3, 2009

I recently learned of the IIF(A,B,C) function. I'm a long time VB/VB.NET Coder who recently spent a lot of time coming up to speed in SQL coding. One (obvious) common thing to do in SQL is something like the following:

select (case where @var = 0 then MyTable.Val1 else MyTable.Val2 end) from MyTable

IIF(A,B,C) will allow me to do this in VB.NET... all on one line.

However, I have read that both B and C are evaluated no matter what A evaluates to.

I can think of some obvious situations where this is a bad thing such as:

Dim X as integer = IIF(SomeBoolean = true, ExpensiveFunction1(), ExpensiveFunction2())

As I will be including this in my repertoire, are there any more subtle situations where I may get myself into trouble using IIF? It's a pretty big departure in some situations from using the old fashioned:

[Code]...

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Access Of Shared Member, Constant Member, Enum Member Or Nested Type Through An Instance; Qualifying Expression Will Not Be Evaluated

Jun 2, 2011

how do I overcome it? I have created a class and compiled into .dll This code

[Code]...

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Warning 1: Access Of Shared Member, Constant Member, Enum Member Or Nested Type Through An Instance; Qualifying Expression Will Not Be Evaluated

May 31, 2010

In the following code i get a warning at line 59:Warning 1: Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.and.. At line 78 I get this Warning:

Warning 2 Property 'SelectedCustomer' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.

The program compiles and runs well, but i cant' undesrtand the reason for these warnings. Any Idea ?

1: Public Class Form1
2:
3: 'Form level members
4: Private objCustomers As New ArrayList

[code]....

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Dec 20, 2010

I have created multiple dropdown list at runtime and populated with data. I also have added an eventhandler to determine the selected value of the drop down list.

The code is as follows :
Dim tbl As New Table()
tbl.EnableViewState = "true"

[code].....

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I have a Visual Basic 2005 program which runs fine if I execute the built Executable. However if I start the application in VS2005 debugger it gives a weird error

[Code]...

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Jul 29, 2010

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I'm creating an app to manage the movies I've watched and get some info about these movies and then display these info in labels.At moment I'm trying to load the "runtime" and "genre" into label3 (runtime) and label5 (genre). Once the movie name is clicked in the listbox control, these info are loaded from a website (webbrowser control) and then displayed in the labels. My question is: Is there any way to make the My.Settings save these info for EACH movie? Something like this:

Saving the info:

vb
If ListBox1.SelectedItem.ToString > 0 Then 'LOADING THE INFO CODE... 'SAVING... 'create: My.Settings.(ListBox1.SelectedItem.ToString & "1") = Label3.text 'create: My.Settings.(ListBox1.SelectedItem.ToString & "2") = Label5.textEnd If

[code]....

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Aug 2, 2009

How to create Combo box at run Time with its Click events and Key Press events.

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Jul 28, 2011

I'm working on a project wich has a MenuStrip and a button.

So what I want to become is when u press the button the process 'notepad' starts and then a MenuItemToolstrip with the notepad icon and text will be added to the Menustrip.

everything works fine when i press the button but when I press the button a second time it doesn't want to add a new menuitemtoolstrip.[code]...

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