How does performance for reading/adding values from/to Dictionary(Of String, omeReferenceType) depend on the number of records already entered? I mean, does timeincrease as O(1), O(log n), O(n) when n goes to be large, or in some other way?
Dim index As New Dictionary(Of String, SomeReferenceType)
' N entries added in a loop
' ...
[code]....
Can I do anything more or less with IDictionary? How do these two collections differ?
View 5 RepliesI have the following web method:
<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json, UseHttpGet:=True, XmlSerializeString:=True)> _
[Code].....
I wanted to use HttpGet here so that the result can be cached.
I tried every variation of calling this, but no luck. Is this possible with GET?
System.Collections.Specialized contains StringDictionary
[url]...
What's difference with Strong Typed Dictionary in Generics?
I am looking to write the contents of a dictionary to XML. I have written the dictionary contents to a string as i have been told it is easier to write from a string to XML instead of from a dictionary. But im not sure if this is correct?
Is there any way to write this to XML from the dictionary or string?
To be able to sort a dictionary by value I'm using this code:
Dim idCurrentJobs As IDictionary(Of String, Int32) = New Dictionary(Of String, Int32)
'The string in the dictionary represents a jobname and the integer is a counter for how many jobs im currently are running in the application'
idCurrentJobs.Add("JobName1", 2)
[code]....
In VB.NET, how can I convert the following string into some kind of key/value type such as a Hashtable, Dictionary, etc?"Name=Fred;Birthday=19-June-1906;ID=12345".I want to extract Birthday or ID without having to split the string into an array.I'd prefer not to split the string into an array in case the format of the string changes later.I don't have control over the string.What if someone switches the order around or adds another element?
View 6 RepliesI need to do some comparing and shuffling of fields, (I come from a more PHP background and working with arrays is completely different, as suggested after reading many things here I know VB.NET uses list and Dictionary easier. I have a dictionary (of string, dictionary (of string, string)) which is filled well, but after I try to read it out, it's always empty....
Below I fill a few things. The var I am talking about it
fillDictionary inside the matcheswholename VALUES part.
I fill up the fillDictionary and add it to the matchesWholename
After which I clear it, because it is in a loop and more is to come.
Dim matchesTotal As New List(Of String)
Dim fillDictionary As New Dictionary(Of String, String)
Dim matchesWholename As New Dictionary(Of String, Dictionary(Of String, String))
Try
If ds.Tables("matchesWholename").Rows.Count > 0 Then
For Each dr As DataRow In ds.Tables("matchesWholename").Rows
[Code] .....
When later I try to readout like this, it returns nothing....I am actually sending a copy of the filldictionary into it or not? or does my clear() method clear what's inside it?
Dim pair As KeyValuePair(Of String, Dictionary(Of String, String))
Dim subpair As KeyValuePair(Of String, String)
For Each pair In matchesWholename
' Display Key and Value.
For Each subpair In pair.Value
Console.WriteLine("{0}, {1}, {2}", pair.Key, subpair.Key, subpair.Value)
Next
This code has changed and will be applied to another question
View 3 RepliesI 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)
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]...
I have a dictionary that I want to access with a key that is the combination of a string (AcctNum) and a date (BalDate).It seems to me the simplest approach is to create the key by simply converting the date to a string and concatenating:MyKey = BalDate.ToString & "|" & AcctNum
I know I also have the option of creating a composite key by writing a separate class and overriding GetHashCode() and Equals() a la this solution. To me, the concatenated string is a simpler, if somewhat less elegant, solution. Am I missing some compelling reason why I should go with the composite key class approach?
This lookup is the crux of the project I am working on, so performance is my main objective (with readability a close second).
So I had a smart idea to make a dictionary with all my variables so I could save them easily in chunks. This includes String, Boolean and Integers. When I was in Framework 3.5 I only had a few warnings about stuff that I didn't have coded in, but now in Framework 4 I am maxing out all my warnings with Implicit conversions. Personally I don't want to go to every number and put quotes around it put quotes around "True" because then it may change the method.
Public Function loadGeneral(ByVal fName As String) As Boolean
Dim tempDict As New Dictionary(Of String, String)
For Each kvp As KeyValuePair(Of String, String) In GeneralSettings
Dim v1 As String = kvp.Key
Dim v2 As String = QuizZing.My.Settings.GetSetting(fName, v1)
[Code] .....
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].........................
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]....
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]...
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.
View 3 RepliesI need to remove an instance in a class for which I also created a dictionary with a string key type. Like this...:
vb
'Declare dictionary
Public PersonsList As New Dictionary(Of String, Person)
'At the bottom of frmMain.vb
[code]....
As you see, I end having 120 instances of the class Person, each assigned with a string key consisting in "student1" to "student120".
At other parts of the program I repeatedly refer to PersonsList("student" & n) to set values at those class entries, mainly with a For n ... Next block.
Now... I need a routine to remove one of those instances for good, including its entry at the dictionary, so my first bet is this...:
vb
Public Sub ExpellStudent(ByVal student_index As Integer)
PersonsList.Remove("student" & selected_student_index)
students_count -= 1
End Sub
I assume this is good enough to remove the KVP at the dictionary AND the class instance proper... right?Well, even if that is ok, I foresee one problem... Let's say I removed "student46". Next time I run a For n = 1 to students_count I would bet that I'll receive an exception due to having a gap at "student46" KVP... and that without saying that students_count will be 119, so it will never reach "student120".In short, I need a way to reassign the KVP of the now 119 Person entries, so they're consecutive again (I don't care about them changing their string key values), so I still could use my For n = 1 to students_count ... Next blocks without problems... but I cannot figure out how.
I have a LINQ2Entity problem, I want to get the value, string, from a database, so I select FProducts.Serial_number, and to end the query, I do .ToDictionary. The problem is, it tells me that it doesn't have sufficient parameters, to convert ToDictionary. So I need something like select FProducts.Serial_number, Nothing). ToDictionary. Also FProducts.Serial_number, 0).ToDictionary doesn't work.
Sub GetStatistics(ByVal ProductNumbers As List(Of String), ByRef Passed As Integer, ByRef FailedProducts As List(Of String))
Passed = 0
FailedProducts = Nothing
[Code]...
I'm trying to setup a WCF web service to be consumed by JavaScript using JSON and jQuery.I've noticed that you can send JSON without a DataContract if the service method parameters match the naming structure of the JSON object:
<ServiceContract(Namespace:="http://foo.com/bar")>
<AspNetCompatibilityRequirements(RequirementsMode:=AspNetCompatibilityRequirementsMode.Allowed)>
[code]....
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]....
I am running windows vista with 1gb memory and 2ghz proccessor. What would be the best FREE version of .NET to use for best performance? Its been years since I have done any PC programming and I would like to do a little bit =]
View 6 Replies[URL]
The upper picture is the output of a Unix task. The lower picture is what I have in VB. Enumerating tasks is not difficult however the rest it is because it's not documented anywhere.
What am I interested in if I want to get 64-bit performance data?
I'm working on a project that calls for high-performance networking with TLS encryption in VB.NET. The stock SSLStream sucks rotten eggs; its 'asynchronous' read/write operations aren't async at all, meaning that they'll operate parallel to each other and to the main thread but that it offers absolutely nothing that resembles async read/read and write/write, which means that reads are totally synchronous to each other and writes are too (only 1 read and only 1 write can be done at a time).
I've done a lot of reading on this failing and it seems like MS has no intention of ever fixing this.Hoping a whole lot not to have to write my own TLS implementation. I've tried the Mentalis open source SSL suite, which will NOT compile. I've tried SocketWrench tools which will not compile under VS 2010 (and whose documentation indicates it's in fact synchronous on its async threads too; can only do 1 async read and 1 async write at a time).
What I want/need is an SSL/TLS implementation that actually works with DotNET that actually allows me to do multiple asynch reads/writes over a TCP/IP transport stream. Anybody have any experience or recommendations on 3rd party toolkits or alternate methods of SSLStream I/O?
I've developed a .NET application that, among other things, does the following:Uses WebClient to retrieve data from a remote server.
Serves as a socket server to 2 'satellite' applications run on the same machine or on a LAN.When I run the app in the VS IDE, it works great. It quickly gets the data from the remote server and communicates perfectly with the 2 satellites.However, when I build it and run it as an EXE, the response from the remote server is very slow and its communication with the 2 satellite applications become very poor.Is there some important difference between running an app in the IDE and running it as an EXE that could effect it like this?
I'm overloading a vb.net search procedure which queries a SQL database.One of the older methods i'm using as a comparison uses a Stored Procedure to perform the search and return the query.My new method uses linq.I'm slightly concerned about the performance when using contains queries with linq. I'm looking at equally comparable queries using both methods.Basically having 1 where clause to Here are some profiler results;
Where name = "ber10rrt1"
Linq query : 24reads
Stored query : 111reads
[code]....
Forgetting for a moment, the indexes (not my database)... The fact of the matter is that both methods are fundamentally performing the same query (albeit the stored procedure does reference a view for [some] of the tables).Is this consitent with other peoples experiance of linq to sql? Also, interestingly enough;Using like "BER10%"
resultset.Where(Function(c) c.ci.Name.StartsWith(name))
Results in the storedproc using 13125reads and linq using 8172reads?
I have this code to ping a list of over 400 switches , the program works fine but for some reason the first time i ping all the switches alot of the attempts time-out(even tho they shouldnt) which makes the program alot slower , if i click ping again less of the attempts time-out(and as a result the program runs faster) and if i click it a third time i usually get a completely accurate result with all the switches pinging back "success" (except for a few which i know for a fact are down anyway) any ideas why this is ?
CODE:
When writing an If statement, I've always used And when needed like: If 1=1 And 2=2 Then. The only time I ever used AndAlso is if the second condition will error if the first isnt true like: If Not IsDbNull(Value) AndAlso Value=2 Then. However, recently I've heard that AndAlso is better for performance than And as the second condition is only read when the first is true. In this case, should I always just use AndAlso?
View 3 RepliesThese 2 ways of working both work, but I'm wondering if there's a difference in performance:
Dim collection As ItemCollection = CType(CellCollection.Where(Function(i) i.IsPending = True), ItemCollection)
For Each item As Item In collection
'Do something here
Next
and
For Each item As Item In CellCollection.Where(Function(i) i.IsPending = True)
'Do something here
Next
I thought the second one was better as you'd have a variable less and looks cleaner, but on second thought, I'm not quite sure what happens when you put a linq query in the iteration.
I'm sorting a collection of type "Document" (usually around 100k records). Sorting usually takes around 4-5 seconds, and I'm wondering if there's a way to speed up sorting by modifying my "DocumentComparer" class which implements IComparer(Of Document). Since the Compare() method would be called hundreds of thousands of times, are there any performance improvements that could be made here that I've overlooked?
[Code]...