Find a variable with concatenation - vb.net

I would like to find a variable with concatenation.
Exemple :
Dim oExcelRangeArray1(0, 0) As Object
Dim oExcelRangeArray2(0, 0) As Object
Dim oExcelRangeArray3(0, 0) As Object
For i As Integer = 1 To 3
oExcelRangeArray & i = xl.Range("A1:Z400").Value
Next
but oExcelRangeArray & i doesn't work.
Thank you

For the extent of my knowledge, there is no way to achieve what you are trying to do directly, because oExcelRangeArray & i will not be evaluated as a separate step before the variable assignment happens.
In my mind you have two choices:
Assign each variable individually,
oExcelRangeArray1 = x1.Range("A1:Z400").Value
oExcelRangeArray2 = x1.Range("A1:Z400").Value
oExcelRangeArray3 = x1.Range("A1:Z400").Value
oExcelRangeArray4 = x1.Range("A1:Z400").Value
Or, add each array to a list, and iterate through it,
Dim oExcelRangeArrayList As New List(Of Object)
oExcelRangeArrayList.Add(oExcelRangeArray1)
oExcelRangeArrayList.Add(oExcelRangeArray2)
oExcelRangeArrayList.Add(oExcelRangeArray3)
oExcelRangeArrayList.Add(oExcelRangeArray4)
For i As Integer = 0 To 3
oExcelRangeArrayList(i) = x1.Range("A1:Z400").Value
Next
[Note: Writing this freehand without checking it, code may not be verbatim; hopefully you get the concept. Corrections welcome.]

Related

VB.Net | Is there a way to reference a dynamic amount of variables as arguments to function/sub?

I'm trying to pass a dynamic amount of variables to a Sub by using ByRef;
Essentially I'm trying to create a module that I can easily import into my projects and make handling the file saving/loading process automated.
The Sub/Function would take a number of variables as references and then loop through them changing each one's value.
I realize I'm missing a crucial point in how visual basic's syntax works but I haven't been able to figure out what I need to do.
The code I've written for this is:
Public Sub LoadSaveToVars(ByRef KeyNamesAndVars() As Object, ByVal FileLoc As String = "")
If isEven(KeyNamesAndVars.Length) Then
Dim Contents As String = My.Computer.FileSystem.ReadAllText(FileLoc)
Dim isOnName As Boolean = True
Dim CurrentVal As String = ""
For i = 0 To KeyNamesAndVars.Length - 1
If isOnName Then
CurrentVal = GetStringValue(KeyNamesAndVars(i), Contents) 'Get the value of the key with the key name in the array
isOnName = False
Else
KeyNamesAndVars(i) = CurrentVal 'Set the variable referenced in the array to the value
isOnName = True
End If
Next
Else
Throw New ArgumentOutOfRangeException("The key names and variables supplied are not even.", "Error loading to variables!")
End If
End Sub
And here's how I try to use this function:
Dim TestVar1 As String = ""
Dim TestVar2 As String = ""
LoadSaveToVars({"key1", TestVar1, "key2", TestVar2})
To keep this question clean I did not include the other functions, but I did make a poor attempt at drawing what I want to happen: https://gyazo.com/eee34b8dff766401f73772bb0fef981a
In the end, I want TestVar1 to be equal to "val1" and TestVar2 to be equal to "val2" and to be able to extend this to a dynamic number of variables. Is this possible?

Iterate through variables using a variable?

I'm trying to find a way to iterate through a list of Strings to be displayed in a text box. These Strings are retrieved from a separate class called 'texts'.
The Strings are declared in the 'texts' class as (for ngs1, 2, 3, etc)
Public Shared ngs1 As String = "Text"
This chunk runs when a next button is clicked, the button's purpose being to iterate through the list of texts displayed.
ElseIf firstTimeRun = True Then
welcome += 1
Select Case welcomePages
Case 1
txtDisplay.Text = texts.ngs1
Case 2
txtDisplay.Text = texts.ngs2
Case 3
txtDisplay.Text = texts.ngs3
End Select
I'm wanting to be able to do this without a select case, so that it's essentially
'Pseudo code
ElseIf firstTimeRun = True Then
welcome += 1
txtDisplay.text = texts.ngs(welcome)
I'm not sure how to properly do this, by using a variable in the name of other variables. Any help would be greatly appreciated, thanks!
If you just want to iterate through all this texts, just create a list(of String) or array and add all the ngsX...
As Example:
Dim list as List(Of String)
Dim indexActualShownString as Integer
Then you can just use in your Clicked_Event
txtDisplay.text=list.Items(indexActualShownString) as Integer
indexActualShwonString += 1
But I am not sure if I understand your problem right. And you should also implement a way to reset indexActualShownString, since I dont know what exactly its the purpose of it.

VB.net For Each Loop with If Statement Error

When this code is ran, Visual Studio gives the error:
InvalidOperationException was unhandled
List that this enumerator is bound to has been modified. An enumerator can only be used if the list does not change.
Dim counter As Integer
For Each x In lstWinners.Items
If x = lstWinners.SelectedItem Then
counter += 1
End If
Next
Here's a screenshot:
http://i.cubeupload.com/lIoWDg.png
EDIT:
This can be fixed by adding this line at the beginning:
Dim anything as string = lstWinners.Text
But why does this error happen, and why does this fix it?
When you are going over the list with for each it kind of "locks" the array. A good way around this is to just copy the array for the iteration.
Just use Array.Copy(source, target, target.Length) where your source would be lstWinners.Items and target is an array you declare. Then do your for each loop on the array. Something like:
Dim counter As Integer
Dim tempcopy(lstWinners.Items.Count) As String
Array.Copy(lstWinners.Items, tempcopy, tempcopy.Length)
For Each x In tempcopy
If x = lstWinners.SelectedItem Then
counter += 1
End If
Next
Perhaps it is seeing the = operator as the assignment operator instead.
Try this code instead:
Dim counter As Integer
For Each x In lstWinners.Items
If x Is lstWinners.SelectedItem Then
counter += 1
End If
Next
Is explicitly compares equality on objects, so it removes any potential ambiguity.
Assuming that your items are strings and you want to count the items with the same text then you could use
Dim counter As Integer
Dim x = lstWinners.SelectedItem.ToString()
counter = lstWinners.Items.Cast(Of String).Count(Function(z) z = x)
However, your code should not give that error unless there is something else that is running and modify your list (a separate thread?)

How to assign a value to an array from a combobox

The code I have is:
Dim Dbase() As String = Nothing
Dbase(0) = Db_ComboBox.Text
I have declared Dbase as array and assigned Nothing, Db_ComboBox is a combobox.
For that assignment statement, I'm getting the following error: "Reference 'Dbase' has a value of 'Nothing'"
What is the reason for this error, and how can I take the value from the combobox and save it in the array?
You need to change this:
Dim Dbase() As String = Nothing
to this (declare an array of 1 element):
Dim Dbase(0) As String
And then this line will work:
Dbase(0) = Db_ComboBox.Text
If you need to change your array size you can use Redim or Redim preserve, as required.
If you anticipate contents of Dbase to change often, I am all with #Joel's suggestion about switching to List(Of String) instead of handling array sizes manually.
Let's look at your code:
Dim Dbase() As String = Nothing
Dbase(0) = Db_ComboBox.Text
Especially the first line. That first line creates a variable that can refer to an array, but the = Nothing portion explicitly tells it, "Do not create a real array here yet". You have, effectively, a pointer that doesn't point to anything.
I get here that what you really need is a List collection that you can append to over time:
Dim Dbase As New List(Of String)()
Dbase.Add(Db_ComboBox.Text)
Dbase() IS NOTHING. Look at this example:
cargoWeights = New Double(10) {}
atmospherePressures = New Short(2, 2, 4, 10) {}
inquiriesByYearMonthDay = New Byte(20)()() {}
That's how you declare arrays.
More examples: http://msdn.microsoft.com/en-us/library/vstudio/wak0wfyt.aspx

VB.NET Array/Hashtable Issue

I am trying to make an array of hashtables. I don't know if this is the best solution, in PHP I would just do a multi-dim array, but it's not so easy in .NET. I am pretty new o VB, so if there is a better solution for this please explain.
I have 2 emails fields for a contact, and a contact can have many. I just want to load in the first two on the edit page for editing, whatever they may be.
Private Sub loadPrimaryContactEmails(ByVal db As CRMDataDataContext, ByVal contactID As Guid)
Dim q = (From ce In db.ContactEmails Where ce.ContactID = contactID Select ce).Take(2)
Dim Emails As Array
Dim count = 0
For Each email In q
Emails(count) = New Hashtable
Emails(count).Add("email", email.Email)
Emails(count).Add("label", email.Label)
Emails(count).Add("id", email.ContactEmailID)
count = count + 1
Next
txtPCEmail1.Text = Emails(0).Item("email")
txtPCEmail1Label.Text = Emails(0).Item("label")
lblEmail1ID.Text = Emails(0).Item("id")
txtPCEmail2.Text = Emails(1).Item("email")
txtPCEmail2Label.Text = Emails(1).Item("label")
lblEmail2ID.Text = Emails(1).Item("id")
End Sub
I get the error the first time I try to reference my array:
txtPCEmail1.Text = Emails(0).Item("email")
The error is:
Object variable or With block variable not set.
It builds, so I thought it might work. I can't just loop through my datasource because I have to explicitly set textbox fields. Is there a better way to go about doing this? Or is there a way to make an array of hashtables work?
EDIT - here is the good code:
So I went w/ the HybridDictionary...
Private Sub loadPrimaryContactEmails(ByVal db As CRMDataDataContext, ByVal contactID As Guid)
Dim q = (From ce In db.ContactEmails Where ce.ContactID = contactID Select ce).Take(2)
Dim Emails As New HybridDictionary()
Dim count = 1
For Each email In q
Emails.Add("email" + NCStr(count), email.Email)
Emails.Add("label" + NCStr(count), email.Label)
Emails.Add("id" + NCStr(count), email.ContactEmailID)
count = count + 1
Next
txtPCEmail1.Text = Emails("email1")
txtPCEmail1Label.Text = Emails("label1")
lblEmail1ID.Text = Emails("id1")
txtPCEmail2.Text = Emails("email2")
txtPCEmail2Label.Text = Emails("label2")
lblEmail2ID.Text = Emails("id2")
End Sub
SO yeah, kind of a hack, but I don't feel like I should have to making special methods just to load some data into a dictionary or array or whatever.
Arrays in VB.NET are different than in PHP. You will need to define the size of your array before attempting to set elements of the array.
Better yet, consider using the generic List<T> collection.
Yes Phil is right you haven't specified the Initial Size of the Array.
And as suggested by him Use generic list or I would recommend
"System.Collections.Specialized.StringCollection" Class or "System.Collections.Specialized.HybridDictionary" class
Build the hashtable first and then build the array.
Dim hash As New Hashtable()
hash.Add("Header", shortModel)
hash.Add("SpecInfo", specinfo)
hash.Add("SerialNumber", serie & "-L")
hash.Add("SerialNumber2", serie)
hash.Add("seriel", serie & "-L")
hash.Add("serie", serie)
hash.Add("Product", modelBase)
hash.Add("varBC", bc)
hash.Add("box_id", boxId.Substring(4).ToString)
Dim dt As DataTable = DbUtil.GetCursor("SFISM4.PKG_AGENCY.sp_get_print_param", {New OracleParameter("in_serie", "3CE5151ZW4")})
For Each row As DataRow In dt.Rows
hash.Add(row("NAME"), row("VALUE"))
Next
Dim mArray(hash.Count() - 1, 1) As String
Dim i As Integer = 0
For Each row As DictionaryEntry In hash
mArray(i, 0) = row.Key.ToString()
mArray(i, 1) = row.Value.ToString()
i = i + 1
Next