Speed Up Looping Through A Dictionary
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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Apr 6, 2010
i have the following snippet of
For Each tempstring In SourceDataCollection
LineToFieldsTemp = Split(tempstring, ",")
LineStringWithoutFirstEntry = "" 'reset the linestring
For i = 1 To UBound(LineToFieldsTemp)
[code]....
essentially what i'm doing is to read through each item in a collection of comma separated variable strings. the first variable in each string is appended to a master filename and becomes the NEW filename to which the entire string will be appended. this is a way to split a CSV file into multiple files using the first variable in that string.
the trouble is that this is doing a LOT of writes to potentially a LOT of files, the IO is taking forever. is there a way to buffer this data until the end, then write it to a disk? be aware, the filenames and total number of files to be created is UNKNOWN at the begining of the loop. it just creates a new file each time a unique first column ID is discovered.
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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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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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Feb 21, 2012
How do i exactly check internet connection speed.I have searched around google and found out a method w/c will Download a file like 1mb size, then it will calculate the speed.
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Dec 31, 2010
how do i check the bandwidth (download speed and possible upload speed) of a user in vb.net or php that uses my app or visits my site resp?
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Nov 30, 2010
I have a codes that calculates DownLoad speed and UpLoad speed kb/s. I would like to implement this kind. I also want to put such kind of graph. Any article or links where can I start building my own like that.
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Jul 29, 2009
i want to monitor the speed at which my system is currently Downloading and uploading. I dont have any idea how will it can be done.
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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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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 4, 2012
i want to check for the lan speed and put this speed value in a progress bar.
for example:
[==== ] the lan speed now is 23 KB/s
and there is another problem is if there are a LAN and a WiFi adapter in the same time how do i check for the speed for both adapters
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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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May 5, 2009
how would i go about getting the of a fan of a computer that my program is running on in rps(revolutions per second) using vb.net?
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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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Jan 12, 2011
Is there an easy way to get the CPU name and Speed? Also for Memory to display in MHz?
Heres a pic of my app and its
Was bored and wanted to make a "Mac" like app (About This Mac). I have some experience with Xcode. Never really did programing on windows before. Also, is there any way to call up a control panel through VB.Net? (Windows Update)
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Feb 28, 2008
currently writing a standard 3-tier (gui/business layer/data layer) winforms application in Visual Studio 2008.I have a form which has to load around 20 different sets of un-related data when it opens. My data layer returns seperate data readers to the business layer and each routine uses seperate sql connections (it opens them, gets a data reader, and then closes it).Now the problem i have is the speed the data is being retrieved. For a relativly small amount of data (around 100 rows of data combined) it's taking say 10 seconds to retrieve, parse into seperate collections and then paint to screen.My form is using controls from Infragistics and Component One and is quite heavy anyway
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Jul 20, 2009
Given a distance (50km) as integer: 50
And a time as string in the following format:00:02:04.05
hh:mm:ss.ms
How would I calculate the avg speed in km/h?
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Jul 11, 2008
is it possible to change the fan speed using vb, i am creating an overclock application and this would be very usefull.(in vb 2008)
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Nov 24, 2009
I have a download manager in my browser that i downloaded from this link :[URL]but i have 2 questions. 1) How do i get the download speed? someone posted this currentspeed = iTotalBytesRead / (sTimer.ElapsedMilliseconds / 1000) but i dont know what that person hade dim ITotalBytesRead?
_Downloader_AmountDownloadedChanged:
lastSize = cSize
If Timer1.Enabled = False Then Timer1.Enabled = True
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Feb 11, 2012
I'm trying to get the upload speed of a ftp stream with vb.net unsuccessfully.I'm not sure if the maths are ok, I googled for a while trying to find the equation for upload and i found it in some code examples but for download.[code]
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Feb 28, 2010
Is it possible to speed up VB.express on an older laptop? For example, is it possible to disable the announcements window for speed. It appears that the announcement window is just another webpage embedded in the program that would slow it down. Any other tricks to get vb.express up to speed on an older machine?
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May 4, 2012
How do I speed up the process of keeping the data to the database from DataGridView to database access
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Jun 12, 2011
What ways do people know how to speed up vb browser?
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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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Aug 7, 2011
I have this program, which prints a sine wave but it's too fast, how can I slow down the console's line printing speed?
[code...]
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Dec 3, 2002
Does anyone know of anyway that it would be possible to speed up the process of loading forms.With VB6, forms (simple ones) was extremely fast but with VB.net, the initial loading of a form (even the simplest one) takes very long. Although it gets better once it's loaded once and the reloaded the next time (almost instanttaneous), but the first time loading gives a bad impression to any user that .net is actually much slower.
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Sep 5, 2011
How do I best speed up running of my program?Once I have simplified code as much as possible, made it smaller. By using loops were appropriate etc.
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Sep 5, 2011
How do I best speed up running of my prog?Once I have simplified code as much as possible, made it smaller. By using loops were appropriate etc.
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