Construct Enumerator At Runtime From XML File
Jul 17, 2010
I am looking for a way to read an XML file at run time and construct an Enumerator from it. I got the reading and writing all working, it's just getting all the strings to create an enumerator that's the tricky part. I could get them into a collection of strings or maybe a dictionary, but not sure how to go about converting from these into an enumerator. The goal of this is to allow users to add and delete items from the underlying enumerators and eliminate writing hard coded enumerators. My idea is to allow users to extend the program without coding. This is a Winform vb app thats not using any database but just XML files to store and retrieve things.
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Jul 15, 2011
Is it possible to construct the name of an object (in this case, a Panel control) at runtime?
What I want to do is change the Backcolor of one Panel that is a member of about fifty panels. I can get the string of the name from the Sender in a RadioButton CheckedChanged event. So what I want to do is something like:
PanelName = sender.parent.name & ".BackColor"
PanelName = Color.Red
(I realize that the syntax above is invalid. I'm just using it to try to get the idea across.)
I can do what I need with big, fifty-element Select Case blocks, but the code is so repetitive that I was hoping there was a more elegant way.
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Apr 25, 2009
For
Each
Item As
DataRowView In
lbOrdersNeedToBeVoided.Items
[code]....
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Jul 20, 2010
I tried utilizing a collections Enumerator inside of a USING block to take care of the Enumerator.dispose call for me, however, I'm getting NullReferenceExceptions when trying to access the Enumerator.Current property after doing a MoveNext.
[Code]...
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May 21, 2009
I have these variables as shown below. The FadeMode is assigned on of the 3 integer values. I would like it to work like an enumerator, so that when I working with the code editor, IntelliSense offers a choice of the 3 possible values. Like x = Fademode.FadeOut
Const FadeIn As Integer = 0
Const FadeOut As Integer = 1
Const FadePause As Integer = 2
Friend FadeMode As Integer = FadeIn
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Feb 13, 2009
If I am using an enumerator to parse a collection such as
Code:
''' <summary>
''' Checks to see if Node1 is a direct child of Node2
''' </summary>
[Code].....
The object comparison of Enumerator.Current and Node1 passes an option strict check, but should I for readability and or for any other reason cast it to the correct type? I know their object references will ultimately be checked the same way, but is it generaly bad form to assume this?
Second question. I recently came across the use of the Enumerator v/s a For/Each loop through the collection, does anyone know the pros/cons of the use of either in specifi situations. Where one is favorible to the other or where they should or should not be used?
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Dec 2, 2011
It looks like passing a list's enumerator to a function "byval" is quite different than passing it "byref". Essentially, regular "byval" passing will NOT change the caller's "enumerator.Current value", even if the function advances the enumerator. I was wondering if anyone knows why this is the case? Is an enumerator a primitive like an integer, without an object reference, and hence changes to it don't get reflected in the caller?This function is byval, and gets stuck in an infinite loop, spitting out "1" message boxes, because the enumerator's "current" never advances past 5.[code]The difference between the two functions is only whether the listFirstItem__ function accepts a byval or a byref enumerator.
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Aug 15, 2011
According to the language specification guide for VB.NET Section 10.9.3. The enumerator expression in a for each loop is copied over into memory. If I have a list of 10000 objects that list will be in memory twice for the code below?
dim myList as new list(of bobs)
'put 10000 bobs in my list
for each x In myList
'do something
next
If I were generating the list from a linqQuery or some other such query it would make sense to generate that list at the for each loop statement thus not having the list in memory twice for example.
for each x in myList.where(function(x) x.name = Y)
'do something
next
If the LINQ query is unreadable on the for each loop, do I forgo readability and just put it on the for each loop declaration line? Should I declare the list in its own variable and just bite the bullet and have the list exist twice in memory?
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Dec 30, 2009
if a call to For Each starts by calling the Enumerator's MoveNext, then Current, then MoveNext, then Current, and so on until MoveNext returns a False then it exits, am i right to say that the Reset is never called?initially i thought that Reset would be called when MoveNext returns False, i tried this (a msgbox would come if it was ever called but i got no msgbox at all)
[code]...
if that's the case, what exactly is the use of the reset in an ienumerator, and is it ok to leave it empty, as such
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Oct 27, 2009
I need to construct a data array and I am not sure if I can do what I need to do given the data. I probably should opt to store in a new class but that's too advanced for now
the data describes a series of points. each point has its index in a list a boolean, binary value and a list of integers of its neighbour points. so i thought it would be three columns and the third column would store a list. can you do this?
I presume i could get rid of the column dedicated to storing the integers..
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Dec 20, 2009
I need to construct an XML transaction of the following format[code]...
I was thinking of creating a "GetXml" function on my object that returns the XML representation of the values in the object instance.I could do all the string concatenation myself, but surely there is a cleaner way.
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Dec 31, 2009
I have an application in VB.Net and now I find out an API is not compatible and requires VB6. I am trying to convert it back to VB6 and have an issue in a Class Module. In VB.Net, I have:
[Code]...
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Jun 21, 2010
Im having some trouble to construct a Master-Details form. When I navigate through each record on the master nothing happens on the details. This is so even if there exit a relation between the two tables in the database and in the dataset between the data table. Can anyone provide me with some samples or examples of coding how to proceed?
Furthermore I have tried to programmatically create the relation but the following error occurs: child list for field cannot be created etc
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Aug 3, 2011
This is probably a dumb question but I have to call one of 30 or so global variables by constructing the variable name to be called from another information. However when i do that it treats it as a string. Any ideas on how to make this work?eg something like this:
Public gsNewYork As String
public sub Getinfo
dim lslocation as string
[code].....
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Mar 11, 2009
I am going to construct a VB program that will calculate dog and cat ages, i plan to have a user interface to ask the user if they have a cat or a dog, then id like another window appear to ask how many human years of age is your dog/cat, up to the age of 20 (in human years) with that input the calculator will give you the age equivilent in dog/cat years.
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Aug 23, 2009
I have a spreadsheet with Proj Numbers: "049410-001" in column B6:B60. I have the URL to the Database: I want the links to show up in the A column with the Tag being the Proj Number "049410-001".
Also, if I could clear the A column and use it "A column" to enter the Proj Numbers and then run the Macro to enable the Hyperlinks I could eleminate the Proj number taking up 2 columns. I have 80 rows set aside for projects so it needs to go through and enable the links that have text in them.
i used =HYPERLINK(E24,B105) (E24 was another wasted cell that combined the static first part of the link, and the proj) as the formula way to do it, but I'm trying to make a Macro that does it behind the scene. but I am just getting into VBA, and I have no idea what i'm looking at when I look at a code.
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Mar 1, 2010
I have a CheckedListBox populated with specific records from an Sql table . I want to update each record in the table, only if the checkbox checkedState = True, so far I can update all or none. This unworkable code will hopefully give an idea of what I need to do.
[Code]....
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Jun 4, 2010
I have a stack of 2D dicom images and want to convert to a 3D object using VB.NET. I suppose I can solve it using openGL but any clue would help a lot. Do you know a free (or at least cheap) pack to do it?
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Mar 1, 2009
I was trying to figure out if anyone had any example of sending ICMP packets over a Socket, when it is in raw mode?It would need to construct the IP Header information, and the raw ICMP packet.
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Feb 13, 2009
I need to use select case to input a month by using its number IE: january = 1, february = 2 etc. when the month is inputted, how many days in that month is the output. I have to take into consideration leap year. the years I am using to determine leap year is 2004,2008,2012,2016 Here is the code I have so far:
Module Module1
Sub Main()
Dim monthnumber As Integer
[code].....
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Mar 31, 2011
Working with System.Cryptography, I'm noticing that data arrays up to a certain size will either conform to the size of the Initialization Vector (IV) or the size of the Key provided. So with a 48-byte Key and a 32-byte IV, up to around 42 bytes of data will encrypt to 32 bytes and 44+ will encrypt to 48 bytes of data. I've tested this with a variety of data arrays, and it seems to always come out the same... but I have a concern that higher byte values in the original array may result in longer encrypted arrays.
how or whether I can construct byte arrays that will be guaranteed to come out of Encryption at a pre-determined size?
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May 27, 2010
I have a need to construct a command Byte to send to another device using bit wise operations.There seem to be plenty of article on how to do this for indiviual bits using an OR'd constant but how do I do this for values that span multiple bits? eg "Bits 4-1" set the repeat count".so how to I inject a repeat count value of say 7 into my command byte?
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Feb 8, 2011
Is there a way to use Meta Tales or Table names to Construct a dynamic query in LINQ?
foreach (var metaTable in db.Mapping.GetTables())
{
var queryType = metaTable.RowType.Type;
[code]....
Is there a way to do something like this? The attempt above yields the error:Could not find an implementation of the query pattern for source type 'System.Data.Linq.ITable'. 'Select' not found. Consider explicitly specifying the type of the range variable 'q'.
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Sep 20, 2011
Is that possible to get current Enumerator (...or iterator? Don't know which tern is the correct one) in a LINQ query ? For example, I try to create a XML output (via LINQ to XML) of all currently loaded assemblies. [code] is it possible to somehow get current "index" (counter?) from LINQ's Selects? I would like to use it in XML. [code]
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Feb 14, 2011
Design a form, which contain a TEXTBOX control that accept a UserID input, with a CommandButton control to perform a validation based on the criteria listed below. Display a Message on whether the UserID is Valid.
Criteria:
The UserID must contains SIX digits follow by a single character, limit the entry to a maximum of seven characters only.
The postfix character of the UserID is derived from the summation of all the six digits divided by seven and using the remain as followed:
Remain
Character
0
A
[Code].....
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Jul 24, 2009
how to save information into a text file from runtime VB2005. However, I wish to be able to write the information into any kind of form of file that cannot be simply opened and read by anyone (such as text file can be). Is there anyway that VB2005 can do this?
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Nov 25, 2011
I am trying to construct a generic interface class with generic functions. My goal was to use this to implement multiple worker classes for database interaction that have the same basic functionality. Each class will deal with different object for example, category, product or supplier but unless the the functions in the interface are generic that this won't work.This is the interface code that I have but I don't know if I have done it correctly. [code]
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Jun 9, 2012
I want to add an item (a .sql-file created based on user input) to the project in my solution at run-time. I tried to do it by using the VS extensibility (using assemblies like EnvDTE.dll and others).
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Aug 14, 2009
i want to make a report at run time using vb.net and sql server stored procedure.
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Apr 13, 2012
I have created a dll using class library project in Visual Studio 2010. I want to access this dll in Excel using declare statement. I have declared my dll entry function with "public shared".
While executing my routine in excel VBA i receive a runtime error "Runtime error:453 cannot find dllentrypoint" I have never created a vb dll, so forgive me if I'm wrong. I am thinking that "shared" declaration isnt sufficient and should use a def file like with C/C++ dlls. I couldnt find the linker option in properties.
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