I have a object collection type of BindingList(of T), i want to take same copy of the object. but the problem is when ever i made the changes in the copy then the original object also reflect that change, how can i avoid it .
View 1 RepliesIs is possible to bind two BindingList<> object to the DataGridView? Both the bindinglist objects are of the same type. I tried binding an array of BindingLit<> object to the grid, but this fails.
View 3 RepliesI have a custom datagridviewcolumn in which i've added an event.The problem is, I can't work out how to see who has subscribed to the current column object's event and add those subscriptions to the cloned column object.
I get around this problem by asking the calling program to pass the address of the handler to a delegate in the custom column, instead of adding a handler to the event.
Let's say we have object A and object B (Picturbox for e.g) Iwant to move A from its position to B's position straightly .what is the mathmatical equalation to get the X,Y coordinator that A must move from its position straightly to B's positionI have another thing ,I would like to know how can I determine that an object (button for e.g) make collusion with a clone of itself.
View 1 RepliesFollowing up on my question yesterday to deepcopy an object with events in C# and attach the events of the original object to the Cloned copy is pretty easy, you just set the Event declaration in the Copy = the value in the original. Deep Clone when events are attached. How do you do this in VB.Net? (Using .Net 2). Maybe there was something with reflection where you can examine what events are bound and somehow transfer those to the new object.
View 1 RepliesI have an object (a third component gridview) which is serializable, and I need a deep clone of this object. I have the following code which throws the exception."The type System.Windows.Forms.Control in assembly System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKey Token=b77a5c5 61934e089 is not serializable".So the gridview's base class is System.Windows.Forms.Control, which is not serializable. How can I get a deep clone from the gridview? [code]
View 5 RepliesLet's say I got a list called myFirstList And then I want to create a copy of that list so I can do some tweaks of my own. So I do this:
mySecondList = myFirstList
mySecondList.doTweaks
But I noticed that the tweaks also affect the myFirstList object! I only want the tweaks to affect the second one And afterwards I will want to completely delete mySecondList, so I do mySecondList = Nothing and I'm good, right?
I have a bindinglist. i am using a textbox to show its itemsWithEvents xBind As New BindingList(Of Emp)
I added items this way
xBind.Add(New emp("alpha0", "B"))
xBind.Add(New emp("alpha1", "B"))
[code].....
I am able to get the index of items added to the BindingList. When I try to get the index if the deleted item I get the error Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
Here is my code
Private Sub cmdRemove_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdRemove.Click
For i As Integer = 0 To _assignedSelection.SelectedCount - 1
Dim item As Jurisdiction = CType(_assignedSelection.GetSelectedRow(i), Jurisdiction)
_list.Remove(item)
Next
End Sub
Private Sub list_Change(ByVal sender As Object, ByVal e As ListChangedEventArgs) Handles _list.ListChanged
[Code]...
I am trying to write a function that has an object parameter. That object will always be an BindingList. That BindingList will be of some unknown (at design Time) class. I think I've figured out how to get the type of the collection object, but now here the tricky part. I'm trying to create a function that can handle any type of collection and be able to return an item from that collection. I need to create a new object of that type and return it from the function. [Code]
View 1 RepliesI have set up a class to hold song information - artist, title. I then created another class that containg a BindingList(of clsSong). I use this binding list to create a data object that can be used to create an RDLC report. This all works. Now I am trying to remove duplicates from the binding list so they don't show up twice on the report. I can't figure out how to get a distinct list for my report. [code]...
View 3 RepliesI am using VB.net 2005 I have a form with a DataGridView on it called "DG"
Here is my Code:Option Explicit On Option Strict On Imports System.ComponentModel
[Code]...
I have created a huge monster based on generic objects and the BindingList. It is a web app that has users, security rights and restrictions, as well as the business logic to persist to the database. I have been using inProc sessions but each user creates about 50 megs of memory. I was initially told that would not be a problem, that a few users it at any time, and the items in the collections were supposed to be lot smaller, but I digress. For the amount of processing that the app has to do in real time, and for how it manages the data, the data it produces is 100%.
The speed and performance has been superior, but the only problem was it was on a box that was used for alot of other applications and it would run out of memory. I have since put it on Server 08 and have placed the Serializable attribute on all classes. I get a an error how ever when the web app tries to serialize the session. I get the feeling that there is an unsaid concensus that inheriting from BindingList is not supported by .net sql or state server session handling.
I have the following code on a form:
Public Sub Init(ByVal SelectedItems As List(Of Cheque))
Items = New BindingList(Of Cheque)(SelectedItems )
BindingSource1.DataSource = Items
[code]....
This code gets called like so:
...
fmEdit.Init(myList)
fmEdit.Show()
All variables are populated etc, it seems to go through the DataBindings.Add ok but when the form appears I get the error about unable to bind to a property or column called Id. I tried replacing the DataBindings.Add code to use the BindingSource1 instead of Items but I get a similar error.The names of the properties in the class match that of the name in the Databindings.Add code.
UPDATE: Here is my class:
Public Class Cheque
Public Id As String
Public Status As Byte
[code]....
There is something that I do not understand the point of, and it has to do with ICloneable.
Take the simple example below:
Public Class MyClass2
Implements ICloneable
Private p_List As New List(Of String)
Private p_Number As Double
[CODE]...
No... For the life of me I cannot understand why anyone would want a Shallow copy of anything.... And... I do not understand why the Me.MemberwiseClone would not work with list and arrays....
on cloning a selected listviewitem from listview1 when a button is clicked to listview2. How do I achieve this? Here is the code I have but does not work exactly how I want it, it just makes a clone of all the listviewitems in listview1.
foreach (ListViewItem item in this.listView1.Items)
this.listView2.Items.Add((ListViewItem)item.Clone());
I would like to know how i can clone an image of a picturebox.I have the picturebox not visible on my screen and want to recreate the image on a certain location.what is the easiest way to do this?
View 2 RepliesI have a panel that is "drawn" on by passing: panel.CreateGraphics.GetHdc() into an api call
I was wondering how i can then clone what is now on that panel to another - i have tried: panel.DrawToBitmap and then painting the resulting image on the other panel - but this doesn't work
oh and also the panels may not be the same size ... so in this case the result would need to be "stretched" or "shrunk"
I ve google addrange method and came to msdn but there they showed this:
Private
Sub
CreateMyListView()
[code]....
Dim img As D.Image = CType(Resources.EtcImage("Title"), Bitmap).Clone(D.Imaging.PixelFormat.Format24bppRgb)
MsgBox(img.PixelFormat.ToString)
[code].....
The following code loads a large 1 bit depth bitmap (10800x7226) on a PictureBox docked and with auto scroll bars.
After loading the bitmap I can drag the scrollbars, and it's very responsive.
After clicking the PictureBox and executing the Bitmap.Clone, dragging the scrollbars becomes very sluggish.[code]...
I am trying to clone some of my Controls, with their EventHandlers. I have a function to retrieve the Delegate of a specific EventHandler.The hard part is to find the correct naming to use.
This is the function I'm using
Private Function GetEventDelegate(ByVal ctrl As Control, ByVal eventname As String) As [Delegate]
[Code]......
I am trying to clone some of my Controls, with their EventHandlers. I have a function to retrieve the Delegate of a specific EventHandler.The hard part is to find the correct naming to use.
This is the function I'm using
Private Function GetEventDelegate(ByVal ctrl As Control, ByVal eventname As String) As [Delegate]
[code]......
I want to make a clone of a selected row in a DataGridView, while searching I saw that a 'Clone' method exists but I can't use it too well I don't know if it is due to have a Binding Source to it. Are someone familiarized with this method ?
View 2 RepliesAre there other conditions that can cause this exception to be raised? I am attempting to use the method to take a section of the source bitmap in question (possibly equal to the entire source bitmap). I have checked my code extensively, including verifying the parameters of the Rectangle at runtime, and even tried hard-coding a Rectangle with parameters that I knew were within the bounds of the source bitmap, but have still received the error. I tried several choices for the PixelFormat as well.
View 6 RepliesIs there a simple way to differentiate single display vs. dual display clone? I am asking about dual clone, not extended desktop. .Net Screen class treats dual clone as single display. I could not find useful WMI method also.
View 6 RepliesI need to copy a database programatically in VB code. To clarify: I want to create CUSTOMER1 database as a copy of MYMODEL database, without the DBA having to manually run scripts . I want to copy schema, indexes, data, primary keys, stored procedures,
View 5 RepliesI am trying to create a clone function to create a deep copy of an object. I have a very simple class with one property, a List of another custom class. Everything I try keeps ending up with the cloned object being a pointer to the original. I was able to do this in C#, but when I translated the code to VB2010 the copy does not work. My simple class is below.
[Code]....
Dim tempList As New BindingList(Of Advocate)(advocates)
Dim bsource As New BindingSource
bsource.DataSource = tempList
[code].....
I have an image that I need to shrink. The original image is a grayscale PNG, which isn't a huge issues except that when I shrink it down, the thermal label printers pickup the artifacts and print them on the label. So, what I did was change the image to black & white (Format1bppIndexed) before resizing, like this:
Dim bte() As Byte = System.Convert.FromBase64String(imgStr)
Dim ms As New IO.MemoryStream(bte)
Dim bmp As New System.Drawing.Bitmap(ms)
[code]....
And then I resize it. This code works fine on my Windows 7 machine, but when I run it on the Windows 2003 Server box that it calls home, it always throws an OutOfMemoryException when it hits the bmp.Clone line.