Deleting a Positon in an array

[harrysk]

Hello i've got a problem with deleting a postion with deleting the current (or selected) member (view my member form in the project link below). http://rapidshare.de/files/1970958/FP2_FilmStore.zip.html I can add and view next or previous members but how do i delete the currently selected member???? Any ideas as im totally stuck and have no idea.

[toxcct]

what are you talking about ? combobox ? listbox ? datagrid ? does the control have an arraylist as datasource ? ps:there is nothing comparable to what you talk about in the link you provided. is the link broken ?

---

TOXCCT >>> GEII power
[toxcct][VisualCalc]

[harrysk]

For the link go to FREE at the bottom of the page, the next page (again at the bottom) you can download my uploaded app. And the Members (control) are stored in arraylist. Although there is nothing in there to start with. The user enters member details (and films) when the app is run.

[rudy net]

You can use class ArrayList. It has a method RemoveAt(). Or if you prefer to stay with your current array then you can use Array.Copy to copy your array to another one then copy back. Array.Copy allows you to specify how many objects to copy, what positions to copy, etc; however, it seems like a bad solution. I prefer ArrayList but the downside of using ArrayList is that you have to cast from object to your class when you get an object from the array.

[harrysk]

Can you give me an example of the array.copy as i'm a newbie also how would i know which one to delete??? If you can would you be able to give an example?

[toxcct]

hey guy, you will have to be more clear (2nd time !!!) where do you get the selected item from ? a combobox ? a listbox ? a datagrid ? i ask this because an arraylist cannot be displayed directly on a form as it is not a control (it is only a container class). SO, i understand you want to delete an element from an arraylist with its index, but where do you get its index from ?? (see the question posted previously on this post)...

---

TOXCCT >>> GEII power
[toxcct][VisualCalc]

[rudy net]

Here is the code using Array.Copy, although it's probably easier to create a loop and copy all elements in an array except the one you want to delete. Dim str As String = "This is my original string" Dim originalArray() As String = str.Split(" ") 'now to remove the fourth word: (index 3) Dim indexToRemove = 3 Dim newArray(originalArray.Length - 2) As String Dim numElementsToCopyFirst = indexToRemove 'copy everything up to index right before the element to be removed Array.Copy(originalArray, 0, newArray, 0, numElementsToCopyFirst) Dim numElementsToCopySecond = originalArray.Length - indexToRemove - 1 Array.Copy(originalArray, indexToRemove + 1, newArray, numElementsToCopyFirst, numElementsToCopySecond) 'now replace original array ReDim originalArray(newArray.Length - 1) Array.Copy(newArray, originalArray, newArray.Length)

[harrysk]

sorry, the member is select using a next/previous button to switch between members. So for example when i click next, the textboxes will fill with the info of that particular member; Name, address, postcode, ID etc.

[toxcct]

harrysk wrote: sorry, the member is select using a next/previous button to switch between members. ok, so if i well understand (you explaination is not well detailled yet but i start understanding what you mean), you have a textbox that display a part of a list, and you move into that list with Previous/Next buttons. so, if you reach doing this, you also have an index variable to point to the element you want to display, right ? this way, your index variable is positioned on the current element, agree ? so, you can do the easy following thing :

Dim MyList As ArrayList
Dim MyIndex As Integer = 0

'You fill your list...

'You use your list...

'Then, you remove the current element :
MyList.RemoveAt(MyIndex)

and that's all... was is so complicated to find by yourself ? maybe you don't know where to find ?! well, you go to the MSDN, filter by Visual Basic, then search for ArrayList (its the members), so read there what seems to answer to your problem... cheers,

---

TOXCCT >>> GEII power
[toxcct][VisualCalc]