Construct Object Names At Runtime?
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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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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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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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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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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Apr 25, 2012
I am coding an invoicing application. The user should be able to add a new line to the billing section of the invoice by selecting a product from a ComboBox, which subsequently fills out various other fields (price, description, etc) based on the selected product.
My problem is this: When the user adds a product, I would like the program to automatically generate a new line for the next product. It seems like the only way to accomplish this would be to create a new set of controls with an incremented name, i.e. Product1, Price1, Desc1 for the first product, Product2, Price2, Desc2 for the second product, etc. Is this possible, or am I going about it all wrong?
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Sep 30, 2010
Is there any way to access your variable names at runtime? Is there any kind of collection you can loop through?
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Jan 30, 2010
I'm having problems regarding using arrays on object names. for example, i have a textbox named txtBox1.text and a array declared as a(2). I what to transfer the value of the textbox to the array using loop.[code]
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Apr 10, 2010
For my assignment i need to list all the objects and their names. Surely i can get a list because typing out 150 names seems a bit ?
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Oct 6, 2008
This is my first post here at Xtreme VB Talk. I just started programming 2 semesters ago. I am currently working on a program but I am having a little trouble with the length. I am trying to take the integer entered in a text box and using it inside the name of another object.
[Code]...
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Jun 18, 2009
project i'm working on for school. Need to make a grade calculator thing but I'm trying to make my code more efficient.
This is what I have at the moment:
txtID.Text = ListBox1.SelectedIndex
txtFname.Text = namesarr(ListBox1.SelectedIndex, 0)
[code].....
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Mar 15, 2012
I don't know if I explained this in my title, this is what i want to do. (In VB on a active server page) I have 5 buttons called but1.....but2. Right now I have the following code to make them invisible
but1.Visible=false;
but2.Visible=false;
but3.Visible=false;
but4.Visible=false;
but5.Visible=false,
Is there a way to access the objects by using a string, example
for(i=i;i<6;i++
items("but"+str(i)).visible=false
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May 2, 2012
I've Created a Table in my Database "T_OPTIONS"
my table looks like this.[code]...
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Jul 18, 2009
I am trying to view all the properties of this:
Dim IISOBJ = GetObject("IIS://LocalHost/W3SVC/1")
For the life of me I can't figure out how to display all the property names of this object.
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Mar 2, 2010
I want to write a routine that loads a table (or query) and outputs it to a text file, with the field names in the first row.If I load the data via an adaptor class into a datatable, I can access the field names by something like DataTab.Columns(i).ColumnName.
As I only want to read the data from the table, using SqlDataReader would be more efficient. But how can I then find what the header or column names are? The following code fails with a message that the SqlDataReader class does not have a member called 'Columns ':
Dim sqlCmd As SqlClient.SqlCommand = New SqlCommand(SQL, Connection)
Connection.Open()
Dim Reader As SqlClient.SqlDataReader = sqlCmd.ExecuteReader()
Dim FName0 As String = Reader.Columns(0).ColumnName() '<==FAILS
Is there a way to find the column names of an SqlDataReader object?
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Sep 1, 2009
I'm trying to create an export Excel/CSV function that will iterate through a custom object and first output the property names and then output the values. I want to use reflection only where necessary so I'm attempting to save the property names when I output the headers and then reuse them to print the values. Is this possible? I'm a little weary of using reflection in a loop but is there a better way?
[Code]...
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Aug 13, 2010
There are issue with using WebBrowser late bind calls related to object/property names generation.For example:
WebBrowser1.Document.DomDocument.Forms.Myform.mycontrol.Value = "test"
will fail with more than one instance of the WebBrowser control.what actually happen is that mycontrol object become Mycontrol and compiled vb.net application will fail with error
Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))
at Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType,
String name, Object[] args, String[] paramnames, Boolean[] CopyBack)[code].....
Same code will work with vb6 app with multiple WebBrowser controls
Edit: This code is comipled with: Option Strict Off
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Jan 29, 2012
what is the meaning of the Ampersand after Boolean in "Result as Boolean"? Also I have seen a question mark after Boolean in some 'Dim' statements. What does that mean?
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Feb 25, 2011
Here's my json:
{"d":{"key1":"value1",
"key2":"value2"}}
Is there any way of accessing the keys and values (in javascript) in this array without knowing what the keys are?
The reason my json is structured like this is that the webmethod that I'm calling via jquery is returning a dictionary. If it's impossible to work with the above, what do I need to change about the way I'm returning the data?
Here's an outline of my webmethod:
<WebMethod()> _
Public Function Foo(ByVal Input As String) As Dictionary(Of String, String)
Dim Results As New Dictionary(Of String, String)
[Code]....
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Jan 18, 2010
I have a blank form and when the use right clicks on the form, they get a context menu with any number of names in the menu. This changes depending on the situation. I can get the context menu to add/remove the list of names but when I click on one of the choices and it goes to my routine (from addhandler) I can't find the property that tells me what they clicked on...
[Code]...
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Oct 6, 2010
I'm trying to create a form that accepts names (or any strings) as input and stores them in a object. See attached form sample.Form Image:
Operations: ï Initially the NumericUpDown object on the form should be disabled.The user enters a value (string) in the textbox and clicks the Add button or presses the Enter key to activate that button.The application then stores that name in a List object, and displays the last entry in the Label underneath.The NumericUpDown should become enable after the first entry. The user should be able to move between all the values entered using NumericUpDown.
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Apr 16, 2010
I've trying to get the runtime path of an OLE Object stored in a database. The code below is used to get the Ole Object (In this case a PDF document).
[code]...
Currently, all that's being returned is a pile of bytes of which I have no clue of how to handle.I need to somehow find the path at runtime of this PDF file in order to use it as the value of the 'src' property (string) for my Adobe Reader control.
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Jun 4, 2010
I get this error in this code:
Private Sub Request_Stuff_button_Click()
Call Main.createObjects
Call My_Control.requestStuff
End Sub
at the 'Call My_Control.requestStuff' line.The 'Main' module looks like this:Public My_Control As ControlObject
[Code]...
right before the line that gets me the error, x gets the correct value right before the error happens which means My_Control is definitely an object and is definitely not nothing.
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Jul 23, 2009
I have an object, o, and a type, T. I'd like to use reflection to change object o to type T at runtime without instantiating it.The equivalent at compile time would be:
Dim p as Point = Nothing I know how to use Activator.CreateInstance to create an instance at run time that is equivalent to: Dim p as New Point()
But i don't want to do this. I have no knowledge of the type's constructor parameters and some types don't have a parameterless constructor. eg. Font. So, to sum up, I'd like a way of performing the equivalent of: Dim o as T = Nothing
In case you're wondering why I'm doing this, it's because I'm using a PropertyGrid on a form to edit types. If this is the first time for editing, say, a Font, then passing an uninitialised Font to the PropertyGrid makes the grid display the default values.
I tried 'o = GetUninitializedObject(T)', but the PropertyGrid either wants a properly initialised object or an object, with a defined type, set to nothing.
I've actually solved my particular problem here: how-to-use-the-property-grid-in-a-form-to-edit-any-type
, but i'd still be interested to know how to assign a type at run-time without the use of a wrapper class (which I was lucky enough to be using).
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Aug 12, 2010
I am developing a fairly large database in VB 2010 as a record keeping. There are 37 tables with some many-to-many relationships in there and some collections too but it all gets loaded into a List of Person object.It is a record keeping database for a youth charity including Personal data, lists of events attended, Medical data, Duke of Edinburgh (UK award scheme) etc The main form is a tabbed form with the linked data from other tables and collection on various tabs
Is it possible to bind a runtime object to a control? if it is possible my life becomes very simple.I can get basic data working with DataSet binding and navigation but the ralationships may prove too fiddly to link as datasets.
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Oct 4, 2009
Trying to create an application where the objects in a form are created during Form.Load depending on the content in an ini-file.The objects I have in mind are textboxes and labels for a start.
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Jan 9, 2010
I want to create a new object of a class which is not predetermined before run-time. Something along the lines of:
[Code]...
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Nov 5, 2009
TabMenu.Controls.Add(btnOrder)
'btnOrder.Parent = Me.TabMenu
'btnOrder.Location = New Point(300, vertloc + 20)
'btnOrder.Text = "Order"
'btnOrder.Name = intCount.ToString & "OrderButton"
So I have my program make buttons similar to the above, I'm going to have a button created at the point were the cursor is, as long as the location is a valid one. Now I have two questions.
1) I want to use the following code to be able to move around any of the new buttons that I place down on the form.
' a quick TY to Ronald_Hare here on the forums for posting this little snippet, as it does exactly what I want.
Private oControlOffsetPoint As Point
Private Sub Button_MouseMove(ByVal sender As Object, ByVal e As
[Code].....
2) I also want to be able to change the back color of the button based on a number of boolean flags I will be setting. Is any of this possible without completely mangling things? I'm hoping there are some easy options for setting a button made on runtime to use a number of premade subs or functions.
On a side note: This does not need to be exclusively a button. a picturebox or a text box would probably work just as well for what I want to do, but I like the look I can get with the button atm.
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Dec 10, 2010
My
Public Class Form1
Dim x As Integer = 0
[Code]....
As you can see, i can retrieve the tag of the button (which is created at runtime) without any problems, i've made a temporary msgbox to show me the value of the tag, just for testing purposes. What i do have a problem with, is retrieving the tag of the individual web browsers, how should i do this?
Next issue, how would i code for my buttons to show the web browser with the same tag as the button that's just been clicked?
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Jun 11, 2011
I am having an issue with a data filled combo box. I can not put my finger on why it is giving me the "run-time error 424 object required" error. The code is simple and the data is there.
Dim sSql As String
Set rsMfg = New ADODB.Recordset
sSql = "Select SourceID, [Source Name Code] AS sc From Source Order By [Source Name Code]"
Set rsMfg = New ADODB.Recordset
[code].....
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