[program-l] Question relating to manually updating value/item in combobox - windows application using C#
- From: Jacob Kruger <Jacob.Kruger@xxxxxxxxxxxx>
- To: "program-l@xxxxxxxxxxxxx" <program-l@xxxxxxxxxxxxx>
- Date: Tue, 27 Oct 2009 10:44:48 +0200
As part of building my interface based on the contents of an XML file, I am
generating combo boxes and populating them by setting their datasource
properties equal to a string[] array that I am generating by splitting the
incoming text/string values.
That piece of code looks like this:
char[] separators = {','};
string[] stItems = stText.Split(separators);
cbNew.DataSource = stItems;
Only problem now is I want to allow the user to select an item, and then try
edit it, but when I try something like updating the item, nothing happens, and
if I try to remove the selected item and then insert a new one using the items
collection, I get a JIT debugger error relating to being unable to update the
collection items of a databound object, when the datasource is set or something
like that.
Suppose if I manually added each item to the items collection initially by
looping through array, it might then be more prepared to let me update them, or
else I should do something like store the data arrays in global variables and
update those or something to hope the databinding would carry out the update
for me?
The code there currently looks like this:
int iIndex = frmParent.curCB.SelectedIndex;
frmParent.curCB.Items.RemoveAt(iIndex);
frmParent.curCB.Items.Insert(iIndex - 1, "new value");
The error text specifically states the following:
System.ArgumentException: Items collection cannot be modified when the
DataSource property is set
Another question is when I want to get the second sub form shown to allow the
user to edit the values in these combo boxes, or add new ones, I seem to have
to manually create an instance of the other form class, and then tell it to
perform a method/subroutine to tell it who it's parent form is so they can
'communicate' with each other, and am pretty sure in VB.Net would generally
just have called a .Show class to an automatic instance of the other forms
class or something, but suppose might also be wrong about that one...<smile>
Sorry if this is a silly question, but, to be honest haven't recently really
done much work on windows apps like this.
Stay well
Jacob Kruger
jacob.kruger@xxxxxxxxxxxx
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