Doesn't The Union Function In LINQ Remove Duplicate Entries?
Aug 9, 2009
I'm using VB .NET and I know that Union normally works ByRef but in VB, Strings are generally processed as if they were primitive datatypes.Consequently, here's the problem:
Sub Main()
Dim firstFile, secondFile As String(), resultingFile As New StringBuilder
firstFile = My.Computer.FileSystem.ReadAllText(My.Computer.FileSystem.SpecialDirectories.Desktop & "1.txt").Split(vbNewLine)
secondFile = My.Computer.FileSystem.ReadAllText(My.Computer.FileSystem.SpecialDirectories.Desktop & "2.txt").Split(vbNewLine)
[Code]...
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Nov 29, 2009
I have a program where you have three entries, CD name, artist, price and it goes into a listbox and .txt file when closing. I have to have a message box if you enter the same CD name. I have a code to open the .txt file and compare strings but I need to change it to compare only the CD name and not all three entries. Is there a way to do my string compare against my listbox without opening the .txt file?? The program loads the listbox from the .txt file when opening. Private Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click' adds CD information to the list box
' declare variables
Dim strName As String
Dim strArtist As String
Dim strPrice As String
[code].....
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Feb 3, 2010
I am trying to union to queries to create an XML file. The query itself works as T-SQL, but my implementation as LINQ-TO-XML fails with "Could not translate expression..." error.Am I asking the wrong question? Is this approach flat wrong? I am new to LINQ. How do I create a single XML from 2 queries?
[code]...
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Jan 19, 2010
I know how to call the Union extension method, e.g.
Dim r = productFirstChars.Union(customerFirstChars)
However I do I do this with the Linq syntax, e.g.
from productFirstChars select ?
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Sep 21, 2011
I have two tables say "Table1" and "Table2". I made a UNION query and saved it as "AllTimesFailure". It is worth mentioning, I am using Access DB. When I am trying to fetch the records from AllTimesFailure through oledbDataReader, it says "The Microsoft Jet database engine cannot find the input table or query 'AllTimesFailure'. Make sure it exists and that its name is spelled correctly.". I double checked query name and found correct but the problem still exists. when I run the same query as I pass through my command object, it works fine in Access query analyzer and fetches records normally.
[Code]...
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Nov 18, 2010
When the user has typed in some information I would like to output possible matches in a descending order, so if someone types in a full first name and a full surname, it should be listed above a result where just the surname matches.I've done something similar in SQL before which worked perfectly, but this time I'd like to do it in LINQ.
Firstname, Surname, City, Country as string variables.
Dim DataEnum As IEnumerable(Of frmTelephone.clsPerson) = alPerson.OfType(Of frmTelephone.clsPerson)()
[code].....
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Feb 10, 2012
How do I prevent a duplicate entry from a text field by using SQL Query?
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Jun 20, 2012
I need to return the same results from linq as I get using SQL
SELECT DISTINCT Area, Region
FROM dbo.Regions
Union
SELECT null,'All'
Order by 1,2
I use this for showing an "All" selecting in a combo box
My current linq points to a view that does the union for me but I want to know how to do it right in linq. I can't figure out how to union a row for the null,'All' values.
Public Shared Function GetRegions(ByVal Area As String) As IEnumerable
Dim DB As New SiteDBDataContext
Return From values In DB.uv_Areas _
[Code].....
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Sep 10, 2009
I've read through all the search results for this and haven't quite got it yet. I often get given Excel spreadsheets of file names and have to check through them for duplicate names.I am making an app to do this for me. I've extracted the data from Excel I'm just having issues with checking for the duplicate. I've tried 2 different ways I found online and neither are working for me,
[Code]...
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Oct 2, 2010
I have 50 Texboxes.
I need to count the number of duplicate entries, and provide a summary (count) for each product code. This makes it easier when the order needs to be placed, and the user don't have to count each value manually.
I have tried looping through all 50 boxes to no avail. This seemed easy, but, clearly I am to thick to think of a solution.
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Feb 8, 2012
I've a question to ask about what kind of the vb.net command suitable to use apply to get the duplicate serial number in notepad?
Ifstrdata.Contains(txt_sn.Text)
Then
if strdata.contains(txt_sn.text)> 1 then --> is this command valid to find those record more than 1 in notepad?
msgbox.show("Duplicate entries was found")
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Apr 5, 2011
I'm trying to create a list of all my objects from several lists of objects using Union.
Return Chart.AnnotativeNodes.Union( _
Chart.DecisionNodes.Union( _
Chart.EndNodes.Union( _
Chart.StartNodes.Union(Chart.WorkCenterNodes))))
The above line gets an error because I can't union List(of AnnotativeNode) with List(of DecisionNode). Each list defined like List(of EndNode) or List(of StartNode), but each class inherits from the base type Node.Is there a possible way to union these to get a result of IEnumerable(of Node)?
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Mar 16, 2009
The following solution should allow the user to enter 'colors' to a combo box; however, if the color is already entered (in an upper, lower case or mixed case format), then the 'Duplicate Color' message should be displayed. I get the message, but my color is also being converted to an upper case format in the combo box.
[Code]...
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Jun 22, 2010
My program is half a formulator, and half ordering system. Where I get stuck is the ordering system part. In one screen I have 5 check boxes that you can check for which products you want to order. The products you checked then get sent to another screen and put into a list box with a quantity variable that starts at 1 attached to it. Now, if you check the same product again, another time through the program, as of now, quantity accumulates to 2, which is good, that's what I want. My problem is I want quantity to keep accumulating, right now it accumulates to 2, then on a third pass through the program,it duplicates the entry, so now in the list box has the original product and quantity of 2, and another entry that has the product with quantity of 2. 't quite understand how they work. Here's the code:
Option Explicit On
Option Strict On
Public Class OrderRequest
[code]....
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Nov 14, 2011
My textbox is supposed to enter one value and enters about 8 of the same thing.
<li class="item">
<asp:LinkButton ID="FeatureButton" runat="server">Feature</asp:LinkButton>
<asp:Panel ID="FeaturePanel" runat="server" CssClass="modalPopup"
[Code]....
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Jan 5, 2010
I have lines like this in my text file
SP-J1-B 203101 Black 99.0 28 0 0
SP-J2-B 203102 Black 99.0 28 0 0
SP-J3-B 20303 Black 99.0 28 0 0
SP-J4-B 20377 Black 99.0 28 0 0
SP-J5-B 203104 Black 99.0 28 0 0
i want to change the value of column two with my own value so i split the string like this
Dim FileContents() As String = IO.File.ReadAllLines("C:\switchoutputA.txt")
For Y As Integer = 0 To FileContents.GetUpperBound(0)
Dim blah() As String = FileContents(Y).Split(New String() {" "},
[Code]....
but some times it dont want to remove empty entries and i get blah(1)="" without any value. how to remove the empty entries?
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Sep 10, 2009
I am trying to split at every space " ", but it will not let me remove empty entries and then find the length, but it is treated as a syntax error.
My code:
TextBox1.Text.Split(" ", StringSplitOptions.RemoveEmptyEntries).Length
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Mar 27, 2012
I have a List object and I want to remove the duplicated items but leaving at least one of the duplicated items in the list;I wrote something like this however I would optimize this code for better performance, is there something faster?
Const chars As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
Dim rnd As New Random()
Dim mylist As List(Of String) = Enumerable.Range(1, 100).Select(Function(i)
[code].....
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Jun 7, 2010
I have a dictionary collection as bleow:
mydic.addvalue(key1, val1)
mydic.addvalue(key2, val1)
mydic.addvalue(key3, val1)
mydic.addvalue(key4, val2)
mydic.addvalue(key5, val2)
From the above dictionary I want to delete all the entries where value == "val1", so that the result would have only following entry:
mydic.addvalue(key4, val2)
mydic.addvalue(key5, val2)
My VB source code is on VS2008 and targeted for 3.5
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Oct 10, 2011
I'm trying to remove individual nodes from their parent, I tried the Remove method but it doesn't seem to be working. How is this done? Is this a bug or what?
Sub Main()
Dim xml =
<?xml version="1.0" encoding="utf-8"?>
[Code].....
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Dec 2, 2009
I am trying to sort a LINQ to SQL query based on two fields. The first field is occasionally null which automatically sorts to the top of an ascending query. Is there any way to make the null entries sort to the bottom?
Here is an example:
From x in SampleDataContext.Event _
Order By x.Date, x.Sequence_Number _
Select x.Date, x.Sequence_Number
[code]....
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Oct 27, 2009
How to remove duplicate resources...
I get this error
"there is already another resource with the name....."
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Aug 16, 2009
2.0 28 Blue (2 14.00 63.0) [2 12.43 54.3] 42111 9275 55111 -1725
2.0 28 Blue (2 14.00 64.0) [2 13.50 55.3] 40611 9275 53611 5775
2.0 28 Blue (2 14.00 58.0) [2 12.21 54.3] 49611 9275 55111 -3225
5.5 28 Blue (2 20.00 17.0) [2 13.50 26.3] 111111 51275 97111 5775
[Code]...
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Apr 11, 2010
I've come unstuck on a certain point. I am trying to find a way to compare two lists and output only lines which are unique. In other words, remove both occurrences of duplicate lines.I'm relatively inexperienced with VB.NET, but this is how far I have managed to come;
Code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim LinksList1, LinksList2 As String
LinksList1 = Replace(RichTextBox1.Text, "#vch", "") : LinksList2 = Replace(RichTextBox2.Text, "#vch", "")
[code]....
1) search the array to find duplicates and add them to a second array, then have a second pass to remove anything which matches the second array.
2) search the array for one duplicate and store it, then search the array again to remove the duplicates, and run that process until there are no more duplicates.
Then again, I could be going about this completely the wrong way. If that's the case, feel free to knock some sense into me.
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Jun 5, 2011
How to make an code to works in that way, if the word is on box1, remove ALL from box2. Theres 3 box and 1 button like that.
[Code]...
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Apr 8, 2010
My browser application has an option to display all the "href" elements of a web page in a datagridview.
I use the code below to populate the datagridview.[code]...
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May 28, 2012
i don't have any idea how to remove or prevent duplicate item in a listview when ever you update it or insert value to your data base.
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Jun 5, 2009
when I load items in to a treeview, there's several items the same.Say it's like this:[code]How do I delete the duplicate items so it only shows subitem once?
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Jan 27, 2012
I have my company's website (Visual Studio / vb / asp.net 4.0) localized in 9 different languages, and they all work great. When you're on, for instance, about.aspx, and you switch to Russian or Swedish, it stays on about.aspx and doesn't add a query-string to the end of the URL; it just changes the page's text to that language. Will the major SEs like Google, Yahoo, etc., consider this duplicate content for SEO purposes and if so, what should I do?
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Jun 13, 2011
When btnSetup is clicked, 7 rows with 24 colored predefined rectangles are displayed in the pbColors picture box as as intended. The controls on the first page of a tab control. I would like this display to remain intact when I change tab pages but when I return to this tab page the picture box is cleared. If I click the button, for some reason the group of colors is displayed twice, one after the other, instead of once as intended.
[Code]....
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