How To Retrieve Object From ArrayList Using Item Property
Jul 28, 2011
I am using the following code to load an ArrayList with an object. [code]I don't know how to retrieve the object from the ArrayList using the Item property. I am using the following withOUT Success. The code is searching the arraylist for a match on serial number. Values(2) is correct and is working fine - the problem is purely getting the object information from the arraylist.[code]How do I pull the propertys back from the object in the arraylist to compare the values with Values(2)?
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Oct 6, 2010
I am trying to solve an issue in my application where the following exception is occurring: there is already an open datareader associated with this command which must be closed first. I am using TableAdapters, which maintain their own DataReaders, and everything seems to work fine unless I am interacting with one of my background workers.
In my code, I shadow the Item property of my collections so that I can retrieve the actual data from the database if needed. Here is a sample:
[code]...
Now each reference to the Item get property instantiates its own DataAdapter, so I am confused as to how the same DataReader will ever be used in this scenario. Is there something I am missing? All the TableAdapters do in fact use the same connection object, but I wouldn't think that would be a problem
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Dec 5, 2006
I am faced with the prospect of having to completely rewrite the application.I have suddenly started to get this error message all the time - it seemed to start after I added a table to the schema, but deleting the table makes no difference. I can't see anything wrong with the connection string, but as it seems to be entirely undocumented, that doesn't mean much.
The connection string contains DataSource=.SQLEXPRESS;AttachDbFilename=|DataDirectory| est.mdf;Integrated Security=True;User Instance=Trueand certainly the string works when I use "test connection" from the application setting edit box. I am assuming that for some reason it is not evaluating the Data Directory , but can't see any reason why it shouldn't. Any ideas gratefully received! What might be a clue though is that I can't get rid of the table I added. I have deleted it from the database, deleted it from designer and saved the file, but it just keeps reapearing! Even when it is not showing, there is still a
table adapter in the .xsd file. I am reluctant to start editing this manually because of the danger of screwing something else up - I did try but it caused an error somewhere else (VS helpfully didn't say where)
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Mar 14, 2010
The issue is when I try to add a new item to the ArrayList with the following code, it gives me an error:
vb Private Sub btnLabelAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLabelAdd.Click
Dim result As String = InputBox("New Filter Label:", "Label List")
[CODE]................
Object reference not set to an instance of an object.
I'm not really sure what I'm supposed to be doing with this. It's a new setting I just added and it's empty, so I'm not sure if that has anything to do with it or not. Anyone know what's going on and what needs to be done to get it to accept a value and not want to be "initialized"?
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Apr 30, 2009
I am trying to have multiple threads run through an arraylist of object and process each object. My problem is that each thread processes every object in the array.So they are not working together on the job. I made sample application to show my problem. I think the problem is somewhere in my ThreadSub() Here is the
Imports System.Threading
Public Class Form1
Dim myitems As New ArrayList
[code]....
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Jul 12, 2009
I am trying to use an arraylist as a property in my class, but I am getting an error when I try to set it in my main code. Is my syntax correct?
Public Class ControlSender
Private _NodeList As ArrayList
Public Property NodeList() As ArrayList
[code].....
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Mar 26, 2010
I was wondering if I can use an ArrayList inside a structure as one of the structure's properties.Or it may be better to replace the structure with a class. If so, can I use an ArrayList as a property of the class.So what I want to do is have the ArrayList as the property of the structure and be able to add items to the ArrayList and clear the ArrayList from a clear method of the structure.
i.e.,
structure.ArrayList.Add (item)
structure.Clear
[code].....
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Apr 11, 2012
I am defining an ArrayList type varaible. It can have of any type of items. I want to know the type of its item. Is there any way to know the type of items in the arraylist variable? I want to know the type of item in the for loop.
Dim ArrList As New ArrayList
Dim A As Integer
Dim s As String
[Code]....
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May 26, 2012
I'm having trouble with removing an item from an ArrayList. I've done it many times, I just can't seem to figure out why it's not working this time around.[code]...
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Jan 19, 2010
After executing a query with LINQ to SQL, the result I have is an arraylist (.ToList) of items with ID numbers. The number of items and their occurences will vary with each query. would simply like to count the occurences of each specific ID in the list. How do I do that?? The only count function I know of (.count() ) is for a count on the entire list. I've also I've been reading on how to loop through the list items but I don't understand how I can do that if I don't know how many specific ID's there will be from each query
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Sep 7, 2010
After executing a query with LINQ to SQL, the result I have is an arraylist (.ToList) of items with ID numbers. The number of items and their occurences will vary with each query. I would simply like to count the occurences of each specific ID in the list.
How do I do that??
The only count function I know of (.count() ) is for a count on the entire list. I've also I've been reading on how to loop through the list items but I don't understand how I can do that if I don't know how many specific ID's there will be from each query result.
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Feb 27, 2012
i have four labels, and for item on Arraylist. how do i set the text of the labels from the Array list, at Random
Each label should pick and display one of the colors. one label should display different item each time i run the program[code...]
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Sep 1, 2011
I have a weird question and I honestly hope you understand what is happening here: I design my form (using VB.NET) and put on it a few textboxes, comboboxes and a listview. After the design, I want to adjust the TabIndexes for each control on the form. On the right-hand side of the interface is the property box.
I then select the 'TabIndex' property item and enter a number key (for instance 0) for that selected item. I then select the next textbox control and enter the next number (for instance 1) WITHOUT re-selecting the 'TabIndex' property item. As soon as I select the combobox or listview control, the currently selected property item jumps to 'Items' or 'Collections' and does NOT remain on the 'TabIndex' property item. Why is this happening? Everything worked fine and all of a sudden this starts happening. Should I reset the editor settings or how can I resolve this matter?
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Mar 18, 2009
I have a listbox with several list items added. I want that as user click on an item, I should be able to show its property. This should change for different items. For example (hypothetical) : Listbox has numbers 1 - 10. Now when I select 1 I should be able to set property - Name, Lastname, Colour, Age.
When I select 2 I should be able to set - Age, Hair Colour (clr shows), Weight, Date. When I select 3 then - City (combo box drop down), Country, Age only. This way value changes for diff items. One way is to put them in property grid and show them. Though this looks nice but adding/removing items in that is not easy. You need to have a class that refer that to prop grid. Do I have to code for each classes for all values in listbox or is there an easier way to manage items in property grid. If you think prop grid is not the right tool for such an activity then can you suggest something else.
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Apr 28, 2011
how do I do the code if I wanna delete a selected item from the array list and not all the items store in the array list? [Code]
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Oct 21, 2010
I have a simple user control, which is essentially just an AutoCompleteBox with some custom logic.
For a specific instance (a collection of Persons), I want it to look like this:
<sdk:AutoCompleteBox Name="myACB" ItemsSource="{Binding People}" FilterMode="StartsWith" MinimumPrefixLength="2" ValueMemberBinding={Binding LastName}>
[Code].....
I want the DisplayMember property to be the property name to display for whatever kind of custom collection (persons, cars, etc) I have bound to the AutoCompleteBox.
I don't think I can modify the datatemplate programmatically. Is there a way I can do this with binding (relative source)?
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May 15, 2009
I want to cycle through a arraylist and for each item in that list I need to create a picturebox, label1, label2 each with specific name attributes
[Code]...
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Sep 30, 2011
I am looking to remove an element from an ArrayList using a query, E.g. DELETE FROM arraylist WHERE (0) = "User1" (Where (0) is the index of the second dimension).
Code:
Dim Users As New ArrayList
Users.Add({"User0", "Details"})
Users.Add({"User1", "Details"})
Users.Remove("User1")
The reason I am looking for a query way to do this is because I will not know what the second dimension value will be.
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Oct 11, 2011
I'm having some trouble adding an object to an arraylist.
Basically the object has two properties (file id/name), but I can't figure out how to assign those properties. During runtime it errors out with public member on the object not found.
Private QueueList As New ArrayList
Public Sub Queue(ByVal FileName As String, ByVal FileID As Integer)
Dim QueueObj As New Object
[Code]....
I'd also like to know how I can do a loop on the arraylist and access the two properites on each record.
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Dec 7, 2009
I have a arraylist with objects from a Product class. This class as properties like Name, Price, ID ...The ID property is a unique identifier for each object.how to search the object with ID=100
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Dec 19, 2011
how to convert an ArrayList to an Object.
If I have the following:
Dim errorArray() As Object
Dim errorList As ArrayList
How do I convert errorList to errorArray() in VB.Net?
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Apr 22, 2010
I have a list of names in a database and what i want is to get all of these names and display them in a label or a text box to the user on the website. I have tried to do this using a for loop but it is always overwriting the label each time. I have a list of 10 different names in the database and what it is doing is putting the first name in the label and then overwriting this with the second name and so on until it reaches the last name. I think i need to store each of the names from the database into an array or an arrayList and then make the label display all of the contents from the array or arrayList. The for loop i have used for this is:
Dim g As SQLadmin = New SQLadmin()
g.DB("SELECT nameOfPerson FROM Persons")
For i As Integer = 0 To g.array.GetLength(0) - 1
[code]....
i can select the names from the database and store them in an array then make the label display each of the names.
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Aug 27, 2009
I searched on the forum / Internet for the solution how a PropetryInfo object (of a Public property) can reveal if it has a Private Protected Setter ... it was all in vain .... all help I found was about how to "Set" value of a public property having a Private Setter.I would like to know if I have a PropertyInfo object of a public property, how would I know if its Setter is Non Public?
I tried, in a exception handling block, where I did a GetValue of the PropertyInfo object and then called SetValue by setting the same value back... but to my surprise it worked well and didn error out.
[Code]...
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Oct 12, 2009
Class Murid
Implements IComparable
Public strNama, strKelas As String[code].....
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Jan 5, 2010
I am having issues adding a custom object to an arraylist at runtime.
Details of what Im trying to achieve.
My object is Fixture which represents a light. My light has the following properties:
Name, isMover, HighlightValue, UserNumber, Channels.
Channels is a dynamic arraylist which lists all the different channels of the fixture. A channel could be the lights colour or its intensity. A channel has the following properties:
Type, FeatureGroup, Value, Universe, Address, Slots and Offset.
Slots is the same again, breaking down to another ArrayList with more details.
Code:
Private Sub Patchingtest()
Dim TestFixture As New Fixture_Structure
Dim Intensity As New Channel
[Code].....
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Jul 20, 2011
VB
Dim pic2 As PictureBox
pic2 = snake.Item(0)
[Code].....
InvalidCastException was unhandled
Unable to cast object of type "System.Boolean' to type 'System.Windows.Forms.PictureBox'.
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Oct 4, 2010
I want to create hypothetically infinite array lists each that can hold hypothetically infinite items. The name of the array list is "arraycalc". How can I perform a procedure that will create a new array list called "arraycalc1"... the next time after that the procedure is run and a new array list called "arraycalc2"...and so on and so forth.
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Aug 30, 2011
I have a group of objects stored in an arraylist. These custom type objects have a number of properties from their underlying class . I want to use one of the properties to sort the array. I cannot determine which Array.Sort method to use.
I want to sort based on an integer property. Virtually every example I can find involves sorting strings.
So, assume the Objects have the following properties.
Obj.name as string
Obj.ID as integer
Obj.Alive as boolean
The objects are kept in an arraylist called FriendsOfMine.
I want to be able to order the list by Obj.ID, both ascending and descending in value.
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Feb 10, 2010
My quest is in regards to xml serialization. I need to get rid of the root node of a collection. I don't have access to my source now so I'll just try to generalize
public class SomeClass
'...some other properties...
<XMLArray(isnullable:=true), _
<XMLArrayitem(datatype:=(getType(object1)), _
[code]....
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Jan 15, 2010
on a Windows Form, an object myObject is bound to myObjectDataBindingSource like this:myObjectDataBindingSource .DatSource = myObject on the form, i have a check box bound to the property: chkProp1 for example of the object: myObjectDataBindingSource In the code when the checkbox is clicked, I need to go in code and change another text property of the object txtProper2 for example like this:
Private Sub chkProp1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkProp1.CheckedChanged
[code].....
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