Dictionary Class And ContainsKey Comparison?
Mar 26, 2009
When using the Dictionary class when the key and value types are your own custom types, is it possible to specify the property of the key type object to use with the ContainsKey method? Best described with an example:
Dim dict as New Dictionary(Of CutsomType, AnotheCustomType)
Dim obj1 as CustomType ' Custom type with 3 properties ID, LastName and FirstName
Dim obj2 as AnotherCustomType
[Code]....
I could just omit the lines with ContainsKey but I'd prefer to know how it's making the comparison and how to change it if required. I don't want to use an integer containing the ID for the key type because I want to reference the whole object later on again.
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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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Jun 11, 2010
I have a Dictionary with key of type UInteger and the value is List(Of Session) where the (Public) class Session contains a couple of variables and a constructor (Public Sub New(...)). Some of the variables in my Session class is:
Private count As Integer
Private StartDate As Date
Private Values As List(Of Integer)
and a couple of methods like:
Friend Sub Counter(ByVal c as Integer)
count += c
End Sub
There is no problem to add values to the Dictionary:
Dim Sessions As New List(Of Session)
Dim dict As New Dictionary(Of Integer, List(Of Sessions))
then some code to fill up a couple of Session objects in Sessions (not shown here) and then:
dict.Add(17, Sessions) ''#No problem
Sessions.Clear()
Sessions = dict(17) ''#This doesn't return anything!
The Sessions object is empty even if the code doesn't returned any error.Is my class Session to compex to be stored in a Dictionary?
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Aug 6, 2010
I need use a collection of differents types, this is:id (long), name (string), type (integer), open (byte) idReg (integer)I would like use it like an array but using the "field" id as key. The only way that i found for do it possible is using a custom class and then a dictionary.This is the custom class:
Public Class frmColeccion
Private m_name As String
Private m_type As Integer
[code]....
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Jul 20, 2011
I want to Serialize and Deserialize a configuration class containing a Dictionary to a XML file.Here is an exemple of what the class look like.
Imports
Public
Class
[code]....
When I try to serialize it with a XmlSerializer I get an exception saying to me that it is impossible to serialise Configuration.Parametres because it implements IDictionary.
DateTime
)
Configuration
System.Collections.Generic
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Nov 20, 2010
I'm trying to create a strongly-typed Dictionary class in VB.NET.I'm tired of typing Dim people as Dictionary(Of String, Person)and want to make a PersonDictionary class so I can say Dim people as PersonDictionary.My reference material says to create a new class that inherits the DictionaryBase class. Then override the Add, Remove, and Item Sub/Properties.It seems like a pretty common pattern, is there an easier way?
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Mar 26, 2012
I'm not sure of the syntax necessary to access a class's attributes inside of a Dictionary declaration.
[Code]...
So if I want to test it and use MsgBox() how do I trickle down to pull, say, name in food > cheese1 > info > attributes2 > name?
EDIT:I just realized that Array in info needs to be a Dictionary for an associative array, so please ignore that error and just assume it is a Dictionary for this question's sake.
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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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Mar 20, 2011
System.Collections.Specialized contains StringDictionary
[url]...
What's difference with Strong Typed Dictionary in Generics?
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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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Dec 30, 2010
result = SendMessage(buttonhandle, BM_GETSTATE, 0, 0)
buttonChecked = (result = BST_CHECKED)
Now I want to know whether the bit for BST_CHECKED is turned on or not.
How would I do that?
I can do
buttonChecked = (result % 2 = BST_CHECKED)
Is there a better way?
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Feb 17, 2012
What is the difference (in bref) between (.NET)
myString == otherString
and
myString.CopareTo(otherString) == 0
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Jan 19, 2010
read this post carfully before you dive headlong into outlining what's wrong/right with the communities.
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Dec 25, 2011
Possible Duplicate: Fastest serializer and deserializer with lowest memory footprint in C#?
I'm using BinaryFormatter class to serialize an structure or a class. (after serialization, I'm going to encrypt the serialized file before saving. (And of course decrypt it before deserialization))But I heard that some other serialization classes are present in .Net Framework. Like XmlSerializer, JavaScriptSerializer, DataContractSerializer and protobuf-net.I want to know, which one is best for me?Less RAM space needed for serialize/deserialize is the most important thing for me. Also speed is important.
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Mar 23, 2009
I am trying to compare two datatables and generate a resultant datatable of rows that do not match based on customer number. The main table "Customers" contains all customers that have been placed in our system. I am trying to generate a table of customers, "dtResults," that we have not ever generated an invoice from a table called "CurrentCust".I would like someone to look at the attached code and see how I can handle the 'InvalidCastException was unhandled', 'Unable to cast object of type 'System.String' to type 'CustomerDataTable' error. Error occurs at line 43.
1
Option Explicit On
2
Option Strict Off
[code]....
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Aug 24, 2011
I have a code in vb, and I'm trying convert it to c#.
_nextContactDate.ToShortDateString > New Date(1900, 1, 1)
This is _nexContractDate declaration:
Private _nextContactDate As DateTime
Comapre datetime to string?
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Aug 7, 2011
im trying to compare time value of to two datetimepickers, i tried to use dt_Start.Value.TimeOfDay > dt_End.Value.TimeOfDay but it doesn't work. btw, i trying to make a scheduler. here are some of my codes:
Dim strUpdate As String
If dt_Start.Value.Date > dt_End.Value.Date Then
MsgBox("End date is earlier than Start Date. Please check.", vbExclamation, "Error!")
ElseIf dt_Start.Value.Date < Today.Date Then
[Code]...
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Dec 9, 2010
In C I write an if statement like:
if (a != 0)
How do I write this != operator in VB?
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Oct 12, 2010
If Object.Value IsNot "Something" Then Can you do this, or are there certain cases in which it wouldn't work? Wasn't sure if this should only be used for integers and booleans.
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Oct 16, 2010
What code should I use to compare two pictures?
I tried those:
If PictureBox1.Image <> PictureBox2.Image then
End If
'and I tried this too:
If PictureBox1.image IsNot PictureBox2.Image then
End If
'But that all did nothing
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Feb 3, 2012
I have searched a lot on the web about changing file attributes in .net , it takes me a long time to get the final code but it was really good. But after all of my search I didn't know why we use "And" when we compare file attribute like this:
If (System.IO.File.GetAttributes(FilePath_txt.Text) And System.IO.FileAttributes.Hidden) = System.IO.FileAttributes.Hidden Then
MsgBox("File is hidden")
Else
MsgBox("File isn't hidden")
End If
Otherwise when I want to set Multiple attributes for on file I have to use "Or" with it like this
System.IO.File.SetAttributes(FilePath_txt.Text, IO.FileAttributes.System Or IO.FileAttributes.Hidden Or IO.FileAttributes.ReadOnly)I know this isn't a big problem but , I can't write a code I don't know how it is actually works.
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Jul 14, 2009
I want somehow to temporarily store and compare two images capture from my web cam every 5 sec. (basically i`m going to use this as motion detection)I figure out how to perform pixel to pixel comparison but the problem is how can i store the images temporarily every 5 sec?Do i need an array?Can i avoid saving the images for the motion detection?Also is it better to convert the images into gray scale or black & white for the comparison or as they are
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Sep 26, 2010
I want to compare between the cell value with the value (parameter) in database. As example, if my cellvalue value is 3 and my paramater(a) in my database is 5 it will be like this
if cellvalue<a then
(some code)
end if
I don't know the exact data type. The reason I need to use data type is because my data is dynamic.
Here is my
protected SubGridView1_RowDataBound(ByVal Sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
con = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;DataSource=C:UsersmeDocumentsVisual Studio 2005WebSitesCSGCSG1.mdb")
con.Open()
[Code] ......
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Jan 4, 2012
I have a computer that takes in a barcode through a Visual Basic program on one computer and I want to be able to compare that barcode as a String to data on a different computer on the same network by ethernet connection where the data is stored in an Excel 2010 file (.xlsm) in Column A in a workbook called 'Data.xlsm'. Before the data is allowed to be saved or used further in the program on the first computer, I would like for the comparison to happen.
Some more details that you all may or may not need.
Computer 1 (where barcode is scanned): Windows 7, Office 2010
Computer 2 (where data file is stored): Windows XP, Office 2007
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Nov 26, 2011
I am making a Texas hold'em poker game for my class project. I already have the cards in the game through an image list. I am now trying to compare the player cards with the flop, turn, and river card to tell the player what they have and if they have won or not. I have tried a number of different things but have come up short. This is the last thing I tried[code]...
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Apr 14, 2011
i have 2 excel sheets (file1.xls, file2.xls), both with 2 columns. the first column of both files contain keywords, (both files have the same). now i want to write code in excel that compares the 2 files and put all the cells that are different in a new file (file3.xls). i already saw an example here on the site, Excel sheet values comparison, but somehow it doesn't fit for what i need, and i don't get it to work.
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Jan 25, 2009
i'm building an image library and one of the things i want to do is compare the most common color in a given image to a set of established colors in rgb format the way i'll probably do this is create 3 arrays for the average r,g and b of each given image, and then compare them to my established values for r,g and b that i want to match to so if my first image has the average values of 255, 125 and 5 for r,g and b..what would be the best way to do a nearest match against my pre-established colors? (about 32 in total)
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Sep 21, 2010
I am working on a program for a customer and am working in VB2010 in VB language. I have two rather large files that contain data. File #1 is over 300,000 lines of data. File #2 is over 100,000 lines. The files are CSV text files. On a User Form, there are two values, "StartTime" and "StopTime". This is the process I am doing:
1. Read both files into ArrayLists
2. Get item #1 of ArrayList #1 (we'll call this "A")
3. Get item #1 of ArrayList #2 (we'll call this "B")
[code]....
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