.net - "Peeking Ahead" While Looping Through Dictionary Items?
Nov 3, 2009
This seems like it should be something very easy to do, but every time I approach this issue, I end up w/ solutions that feel "less than elegant" Here is my basic question: If I am looping through a dictionary that I have ordered in a particular way, within any given point in the loop how can I "peek" or get reference to a dictionary item 'x' places ahead of the current item without changing the current enumerator? For instance:
Dim tempDictionary = New Dictionary(Of String, String)
tempDictionary.Add("TestName1", "TestValue1")
tempDictionary.Add("TestName2", "TestValue2")
tempDictionary.Add("TestName3", "TestValue3")
[code]....
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Jan 25, 2010
I want to group items from a linq query under a header, so that for each header I have a list of objects that match the header title. I assumed the solution would be to use ToDictionary to convert the objects, but this allows only one object per "group" (or dictionary key). I assumed I could create the dictionary of type (String, List Of()), but I can't figure out how to write it. As an example I have written a simplified version below.
[Code]...
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May 17, 2011
I have a process that imports a daily file of product registrations, and adds them into our database. Originally this process would query against the database multiple times for each record to determine how to process the data.In order to speed up this process and prevent any timeout issues that could appear to people trying to use a reporting site that uses the same database, I've changed the code to pull down a few of the tables into dictionaries, and then iterate across them to see if that customer/address/dealership exists, and pull the Id from the key of the dictionary if it does, or insert it into the table and then the dictionary if it doesn't.However, I'm currently finding this to be running slower than if I were querying the database multiple times for each registration. One possible cause that I can think of is that my dictionaries are quite large (one has 8 million entries and another has 11 million).[code]
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Aug 31, 2011
I don't know if this is doable, maybe with Linq, but I have a List(Of MyType):
Public Class MyType
Property key As Char
Property description As String
End Class
And I want to create a Dictionary(Of Char, MyType) using the key field as the dictionary keys and the values in the List as the dictionary values, with something like:
New Dictionary(Of Char, MyType)(??)
Even if this is doable, internally it will loop through all the List items, I guess?
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Sep 10, 2011
i have 2 forms. in the 2nd form im updating the dictionary. i hav listboxes in form1 as well as on form2, i need to update both the forms with the dictionary values and these values should be displayed in the listboxes everytime the program is run.i had tried updating the listboxes directly from the databses, but this is giving me problems of repetition, so im trying out using dictionary.
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Feb 18, 2011
We're trying to access the Sent Items folder in Outlook 2007 (using Exchange) but the test for TypeOf(i) Is Outlook.MailItem in the below code snippet always returns False.We know we have the right folder because a test for items.Count returns the correct number of mail items.Inbox messages are fine. If we change the folder from olFolderSentMail to olFolderInbox the test for TypeOf(i) Is Outlook.MailItem passes and it's quite happy to show us the Subject.
Dim app As Outlook.Application = Nothing
Dim ns As Outlook.NameSpace = Nothing
Dim siFolder As Outlook.Folder = Nothing[code]....
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Mar 8, 2012
I have the following piece of code which is giving an odd error that I can't seem to locate.[code]...
I manually edited the file to remove the item where the error is happening and it continues to happen on the next item. If I stop it at 2500 no problems. Could it be to many items in the dictionary maybe.
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Jan 12, 2012
I was wondering if it is possible to write both the dictionary key and all records associated with the value to string?
However i only get the output of the Key and one item in value (service status)
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Aug 27, 2011
I'm trying to save each item in the listview to the database.Below is my code in saving items in the database. The MISSING CODE HERE is where I should place the listview item.
Dim commandText As String = "INSERT INTO tblBorrower (TransactionNo, IDNumber, SerialCode, DateBorrowed) VALUES (@TransactionNo, @IDNumber, @SerialCode, @DateBorrowed)"
Using connection As New SqlConnection("Data Source=GAMER-6SQLEXPRESS;Initial Catalog=dbInventory;Integrated Security=True"), _
command As New SqlCommand(commandText, connection)
command.Parameters.AddWithValue("@TransactionNo", intTransaction)
[Code]...
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Feb 25, 2011
At the moment I have a listbox and two buttons. The first button will add files from a directory to the listbox, whilst my second button processes a single txt file inside a folder to remove certain words, then save the processed document as a copy.
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
' Replace common words and all symbols.
Dim wordsToReplace() As String = {" cat ", " hat ", " that ", ", ", ". "}
Using sr As System.IO.StreamReader = New System.IO.StreamReader("C:User est.txt")
' Read the entire file into memory.
[Code] .....
What I am trying to do now, is rather than process documents in a static folder, I want to process the documents that are inside my listbox, and save the new copies back to the list box (repopulate the list box with the processed txt files, I hope that makes sense). What I think I need to do is loop through the listbox and take the file path for each item, process it, then feed these back into my listbox.
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Jun 23, 2011
When one is clicked, would like to be able to have it checked, and uncheck all the restCheckOnClick will not uncheck the rest (I want an effect similar to radio buttons).My first plan was to loop through each item in the ToolStrip Items() array, however these are ToolStripItems (which are a base class) and thus do not have the Checked property. So then I thought about using CType to convert them to ToolStripButtons, which do have the Checked property, except what should I do about the ToolStripSplitButtons?I basically want to say, "if this ToolStripItem is as ToolStripButton, then uncheck it"
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Mar 15, 2010
I am trying to created nested dictionary variable like the below, But I get compile error stating that it needs "}" at line where I am adding items (line #2) to my nested dictionary. What Am I missing here?
[Code]...
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Jul 2, 2009
I have been making an rpg that i have been programing to be event driven, so the last step at this point is the items... i tryed using dictionary to store all the items but this kinda failed(Im not shure if dictionary is good idea for something like this any way). well i know how to hard code the items but i dont want to do this(Event Drivien is better). So any ideas on how i could store the items?
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Jan 30, 2010
I'm translating my VB.Net application, and I need to loop through all the controls on my form. Using a recursive function such as
[Code]...
But there is obviously an inheritance problem, since CommonDialog objects are not controls.
Is there a way for me to loop through really all the items displayed on my form?
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Jun 22, 2010
i need to find the records between now and a week ahead.I have this so far
Dim con As New OleDb.OleDbConnection
Dim OleDBCon As System.Data.OleDb.OleDbConnection
Dim ds As New DataSet
[code]....
comes up with Conversion from string "SELECT * FROM tblBookings WHERE " to type 'Long' is not valid. error.
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Mar 29, 2012
I am writing a windows application in VB.Net.
My client wants an intelligent combo box with type ahead capability. For example let's I have a list of companies. I want to find my company "MetaPro". With the Microsoft combo box if you type in the first letter of the name it will bring up first one starting with that letter. For example I type in "M" it will bring up "Mass. Dept. of Ed.", I then type in "E" I get the first one starting with "E" maybe "E, G & G" where I want the first one starting with "ME".
Perhaps there is an open source solution to this or I could create a custom control. But I don't know how.
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Jun 19, 2010
Got a problem that's hopefully a quick fix. I've got a homework assignment where I have to link an access database file and allow the user to go through the records, add/delete records and save the file.
When I run the program everything seems to work fine, except when I hit the next button to go to the next record, it always skips 2 ahead, from 1 to 3 and 3 to 5. The previous does it also and when I click the delete it deletes 2 records. I can't figure out why it's doing this. The table we linked was already created for us so I don't believe that it is a problem with that. One weird thing I noticed is that it shows that there are 5 records so I wouldn't think that it is seeing 2 as 1.
Here is my code for the buttons:
CODE:
Here is the full code
CODE:
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Apr 27, 2009
I have created a class with a function in it. I have a collection of data I want to pass back. I tried an arraylist first. Now I am trying to use a dictionary. My problem is that it creates the dictionary ok, but I am only get the last row of data from my
Function GetWeldAuditInfo(ByVal ResourceId
As
String,
ByVal VendorId
[CODE].........................
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Apr 16, 2012
I have the following object:
countDictionary As Dictionary(of Category, Dictionary(of Date, Integer))
The Class has a Enumeration Property. For the purposes of demonstration, I'll call it MasterCategory.I have been trying to get out an object that looks like the following:
groupedCountDictionary As Dictionary(of MasterCategory, Dictionary(of Date, Integer)
The best result I could get was:
Lookup(of MasterCategory, Dictionary(of Date, Integer))
From:
countDictionary.ToLookup(Function(o) o.Key.MasterCategory, Function(o) o.Value)
Which results in a IEnumerable (Of Dictionary(of Date, Integer)) for each MasterCategory value.However, I need that IEnumerable of Dictionary flattened to one dictionary with all the integers summed (total counts) for each date. I then tried to use various selects and group bys (from numerous stackoverflow posts) to "flatten" it, but my efforts have fallen short.
Current Code
[Category Class]
- MasterCategory As Enum
- Name As String etc
[code]....
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Jan 5, 2012
I have a form in my vb.net application used to take the data about the returned stock. The form contains two comboboxes. One, named combobox5, contains invoice numbers and the other, named combobox3, contains party codes. Both the comboboxes are pre_loaded using sqldataadapter.
Now what i want is to change the party code in combobox3 when the invoice number is changed in combobox5. Elaborating it further, When Stock is issued the party code is stored along with the invoice number to keep track of to which party was the stock issued. Now when stock is returned i want to keep track that which party has returned the stock and i want that the party code should be automatically selected when the invoice number is changed and it should be what is stored in the database against that particular invoice number....
I'm using the following code for doing so:
Private Sub ComboBox5_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox5.SelectedIndexChanged
' defines a new connection to the database
Dim con As New SqlConnection("Data Source=TAHA;Initial Catalog=ADT;Integrated Security=True")
[Code].....
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Jul 7, 2010
I have created a Dictionary class (MyDictionary for the example). I am currently trying to pass MyDictionary into a function, filter it into a new instance of MyDictionary and pass this new instance into another method. When I am attempting to create the second instance from the filtered first instance of MyDictionary via Lambda Expressions and the ToDictionary Method, I am getting the following error:
Unable to cast object of type 'System.Collections.Generic.Dictionary`2[System.Int32,System.String]' to type 'MyDictionary'. I have simplified the example and recreated it in LINQPad and am getting the same error.
Here's the simplified version of my code:
[Code]...
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Jan 6, 2011
I use VS2005 and I have just started working with the dictionary in particular the Dictionary.ContainsKey method. At the bottom of the page in the msdn library it says the following in the community content How to make sure that Contains functions properly.
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Feb 26, 2010
How would I go about copying every value of one Dictionary list to another Dictionary list.
Here is what I've done:
VB.net
' Assign values to player pairs enumeration
Private Enum cmptrPairsList
empty = 0
[code]....
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Jun 21, 2012
I have written this function to auto correct gender to M or F from different values in a string array. It works fine but my manager told me to use Dictionary which he said is more efficient.[code]
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Sep 27, 2011
Is it possible to change the key of a dictionary?
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Apr 19, 2010
I have a dictionary in the form of: { "honda" : 4, "toyota": 7, "ford" : 3, "chevy": 10 }
I want to sort it by the second column aka (the value) descending.
Desired output:
"chevy", 10
"toyota", 7
"honda", 4
"ford", 3
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Sep 27, 2011
Is it possible to change the key of a dictionary?
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Oct 19, 2011
I need to order a Dictionary in VB.net based off of the keys. The keys and values are all strings. The dictionary does not have a .Sort(). Is there a way to do this without having to write my own sorting algorithm?
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Mar 15, 2010
I have a dictionary of key=string and value=datatable. I use a key to retrieve a datatable and assign that datatable to a new variable. Then I make some updates to the variable. However, I find that the dictionary itself is being updated even though I'm only updating the variable. This causes significant issues when I try to reference the dictionary later. How can I set up my dictionary so that it won't update when I use a value?
dim dt1 as datatable
dt1=dictionary(key)
For row=0 to dt1.rows.count
dt1.Rows(row)(4)=dt1.rows(row)(4)/2
Next row
'at this point, when I look up dictionary(key), the value I get shows all of the original values divided by 2.
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Dec 6, 2010
It is possible to output all the dictionary values to a textbox? Not the keys, just the values of all the keys.
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