I created my own Dictionary class, based on the .NET Dictionary. Now I want to overload then Item() Method. This works fine with the following code: Public Overloads Property Item(ByVal key As TKey) As TValue
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Is it possible to retrieve the index number of an item/key in a Dictionary(Of TKey, TValue) object?
View 13 RepliesI am writing a class library to interact with a domain Active Directory. In my object model, I have the following:
Domain;
Organizational Unit;
Group;
User.
In my Domain object, I have an Entries property and an Add() method.
public class Domain {
// The ReadOnlyDictionary<TKey, TValue> is a custom wrapper over an IDictionary.
public ReadOnlyDictionary<string, IDirectoryEntry> Entries { get; }
public void Add(IDirectoryEntry entry) {
Entries.Add(entry.Name, entry);
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For your information, I implemented the INotifyPropertyChanged interface to ease my life, but I don't seem to find a way to make it work the way I want. Perhaps am I not doing things right somehow, as for the location of different methods, I don't know. How can I make my Domain aware of a change that occured within one of its Entries, so that the TKey value is also changed? That is wanted because one could possibly add an entry, change its name meanwhile adding a new entry with the "old" name of the actual within entry, and cause a conflict, etc. In the end, causing the test to fail. But I'd like to make it pass like it actually is. Is there another better approach or workaround?
Is there any way to do the same in VB.NET?[code]...
View 1 RepliesI have the following in VB:
Dim sources = From source In importSources Select New With _
{.Type = source.Key, .Source = source.Value.Name}
dgridSourceFiles.DataSource = sources
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This overload resolution failed error that occurs when I try to add the newly created integer array as an item in a generic linked list as per the following?
Imports System.Collections.Generic
Public Class GraphData
Dim mInput As Byte()
Public Data() As Integer
Dim SignalData As New LinkedList(Of Integer)(Data)
Private Sub Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
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If I want to get a value in Dictionary, but I give key was not in the dictionary, and than exception will be raise "The given key was not present in the dictionary." . but In this infomation does not appear whitch key not contain, the question is:
1. How can I know whitch key does not contain when exception be raised ? Every time use TryGetValue or ContainsKey is too multifarious
2. If I Inherits Dictionary, how can I implement the code like "sP = oDI("a1")",
public Class MyDictionary(Of TKey, TValue)
Inherits Dictionary(Of TKey, TValue)
Public myobject As MyDictionary(Of TKey, TValue)
Sub New()
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I have a dictionary that has strings variables as keys and a List collection of doubles as values.
Dim CellAddressContainer As New Dictionary(Of String, List(Of Double))
Dim Results As New List(Of Double)
Within a loop I populate the Results variable as follows:
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I am working on a bound DataGrid that displays data from a database. I'm using Silverlight 5 if that helps. Currently all the data is stored in a Dictionary within the my entity object. Using the Property[Key] syntax for the binding path binds properly for display purposes. But the column acts like it is readonly when trying to change a column value in runtime.
Public Class Entity
Public Property Attributes As New Dictionary(Of String, Object)
End Class
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My only thought right now is to store the column values in ordered lists and display them using an index rather than key. But I would really like to know why the key isn't working.
If i wish to put items into a System.Collections.Generic.Dictionary, I can either Add or set the Item.I know if you do Add it helps you check if the key already exists and if not it throws an exception.Now I'm curious, so if I'm adding a ton of items, should I prefer setting Item instead of Add since Add does unnecessary checks that may actually slow things down?
View 3 RepliesI 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.
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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
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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
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VB2008. I would like to use a Dictionary(Of TKey, Tvalue) where the key is a pair of Integer (and TValue is String, no problem). How can I declare it ? How can I add an item ? How can I retrieve a value, knowing the key ? I can do it when the key is an Integer, but with a pair of Integer I am lost.
View 2 RepliesI want to create an implementation of the IDictionary(Of TKey, TValue) interface to provide some wrapper functionality.
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The error is Interface 'System.Collections.Generic.ICollection(Of T) is not implemented by this class. I am not sure what to do about this error. I don't even really understand it. I trade to change the (Of T) to (Of TValue) but that didn't help.
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:
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There are a lot of different generic collections available, so the wisdom in creating a new one may be questionable right from the start.However, I often find myself wanting the same features from my custom generic lists, but cannot quite find all of those features in an existing object; namely, I would like to have a generic collection which works like a List or Dictionary (much like the System.Collections. ObjectModel. Keyed Collection(Of TKey, TValue)), but also works like a BindingSource does when it is bound to an ADO object (that is, it supports full sorting and filtering as well as currency).A feature I almost never need however, is transactional adds (the BindingSource's ability to 'cancel add-new').Again, with so many existing collections out there, I should take a moment to go over the reasons why none of them quite meet my needs.There is the System. ComponentModel. BindingList(Of T) which would provide some of the functionality of a BindingSource, but has strict requirements about the type {T} implementing IComparable in order to support sorting, and does not provide filtering (it is not an IBindingListView).It also only maintains a base item list by index, so does not provide keyed access.We could use simple databinding with a custom list inheriting from System.Collections. ObjectModel. Keyed Collection(Of TKey, TValue) bound to a BindingSource, but again TValue would have to implement IComparable to support sorting and we would still not have filter support.So to get all the features I was after, I decided that the best thing would be to create a new generic collection object which implemented IList, IDictionary, IBindingList, and IBindingListView (along with a few others) and would be capable of serving as a simple list, or as a binding source while providing full sorting and filtering over any newable object type.
To that end, I've created the KeyedObjectModel which contains the KeyedBindingList(Of TKey, T) generic collection/binding source. This collection can be used as a typical list, or as a binding source (you do not need an additional BindingSource component between the collection and UI controls, although you could certainly have one).Various constructors are provided in order to initialize an instance of the collection as either an enhanced list-dictionary, or as a complete BindingSource.Any object that has a public constructor which takes no arguments can be used at type {T}, providing that the object has a property of type {TKey} which will contain unique values for each entity in a given collection.If the object implements System.ComponentModel.NotifyPropertyChanged then the collection will also bubble up property changes on the current item to the collection's CurrentItemChanged event.An implementation of IComparable on type {T} is irrelevant because sorting and filtering are performed on the property values of {T} based on the type of the specified property.The current design of KeyedBindingList(Of TKey, T) is in an 'alpha' stage.The class is mostly complete from a feature implementation standpoint, however, the code has not yet been optimized and the base collections of values, keys, and view are being maintianed in generic lists of their own, rather than raw arrays.However, even without performance tuning, the collection appears to be performing quite well, up to a few thousand entries, given the amount of flexibility and funcitonality it provides.At this stage, I would really love to get some peers to try using the compiled DLL and beat up the collection a bit.Once the code has been proven and optimized, I will publish it as an example.It is a fairly complex class though (currently made up of eleven or so partial classes) so I don't really want to post the code until it has been optimized. [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 RepliesRegarding my college project. i'm working on a sales system . i have a form which consist of all the following information( item code , item name , item price , quantity of item ) which is display using a data grid . data input by user using text box and all this information will be stored in a database(sales database) i'm using ms access 2007. the grand total will be displayed in a text box . and amount paid will be input in a text box too , my major problem now is how to i create a reciept that will have all this information of the purcase. i have a reciept button . what the next step ? i dont have any idea how to get the reciept done.
Imports System.Data.OleDb
Public Class Form5
Dim con As New OleDbConnection
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I want to make a GetAllContacts method which takes a sort parameter of type Func(Of Contact, TKey) which is the same type that the OrderBy method for an IEnumerable(Of Contact) takes.[code]"Too many arguments to extension method 'Public Function ElementAtOrDefault(index As Integer) As Contact' defined in 'System.Linq.Enumerable'." on the second parameter.
View 2 RepliesI have a list box on the form which functions as a copy/paste. When you copy something, it is automatically added to the list box as a "clipboard helper". Here is the problem,however: if the text is more than 1 line, the list box does not show all the text.It ends up looking messy.So getting back to my question, is it possible to make the list box item height for an item depending on the amount of lines that item contains?This is a one line sentence in the list box and should take up one line.This is a multi line sentence in the list box and should take up two lines for item height.
View 11 RepliesIn my application I have a listbox and SelectionMode should be MultiSimple because users need to see which items they selected. In another tab we have another listbox this one should show all the selection users had done in first tab. Private Sub
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What I am doing is generic and has been done a thousand times, but I can't figure out how other programmers do this.
I am working with the Law of Sines to return an angle of A. There are two combinations, for instance:
Return Angle A given (side b, side a, angle B)
Return Angle A given (side c, side a, angle C)
----Note: All together there would be six, two for each angle)----
I can't overload the functions because the signatures are not unique. The parameters and return type are primitive type Double.
The use of Aliases works for reading the code but does nothing to resolve my issue.
One approach I thought of was to create a structure for each side and angle; however, I don't want to create any more complexity than needed.
Another solution could be using a strategy design pattern?
I've done plenty of Method Overloading, but now I have an instance where I would like to Overload a Property. The IDE in Visual Studio seems to allow it, since I can actually set up the two overloads, but I get an error saying it is not valid because they only differ in type. I think I'm missing something in my syntax?I want to be able to use two (or more) different custom classes as the Type for my property.
Public Overloads Property myFlexibleProperty() As myCustomClass1
Get
Return _myFlexibleProperty1
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1) SortedLIst has a GetKey property: you ask for the nth key in the sorted list of keys and you get it. SortedList(of TKey, TValue) does not have this kind of feature. Why not?
2) SortedList stores values as "object." Is this a less memory-effective method to store values of Double than SortedList(of TKey, TValue)?
1)When we use Overload constructors in a class
2)and which one is get execut first.
Public Class remoteobj
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I am trying to pass multiple signature calls to an overloaded function. My understanding is that VB can recognize the different signatures and use the appropriate function.[code]...
View 2 Repliesif it is possible to overload or override (not sure about the difference) functions in a modual.vb.
View 7 RepliesI'd like to do a kind of overload of the actions in the controller.
Is it possible? 'Cause I havn't found any info about it. And when I tryed, I got this error.
The current request for action 'Create' on controller type 'InterviewController' is >ambiguous between the following action methods:
System.Web.Mvc.ViewResult Create() on type
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I've tryed few things to get what I wanted. The last one was to copy what was done in the "Edit" action, but for an empty rank. (so I created an empty rank in my DB). I don't think it was a good idea (imagine someone wants to update the DB where idOpportunite = 5...)
i have this piece of code (which is part of Unolib)
Private Sub Saveonefile(ByRef fl As Sockets.TcpListener)
Dim Client As Sockets.Socket
Dim name As String
Dim buffer(PacketSize - 1) As Byte
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there are actually 3 errors, but they are all like this one?