delete item if List.Items[a]==List.SelectedItems[b]

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1.00/5 (1 vote)

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hi! i dont understand why this doesn't work correctly...

can you please check the error with this one?

C#

int a=0;
int b=0;
while(gvList.SelectedItems.Count>0)
{
    if(gvList.Items[a]==gvList.SelectedItems[b])
    {
        myList.RemoveAt(a);
    }
    else
    {
        a++;
    }
}

//gvList is a gridview
//myList is a list. it is the itemsource of gvList

Posted 2-May-11 5:20am

Member 7838027

Updated 2-May-11 5:42am

v3

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#realJSOP · Answer 1 · 2011-05-02T06:16:00

Solution 2

Try this:

C#

for (int i = 0; i < gvList.SelectedItems.Count; i++)
{
    gvList.Items.Remove(gvList.SelectedItems[i]);
}
gvList.SelectedItems.Clear();

(you may have to traverse the SelectedItems collection backwards)

Posted 2-May-11 6:16am

#realJSOP

Updated 2-May-11 6:18am

v3

Comments

Niklas L 2-May-11 14:24pm

Backwards is the key to success :) Fived.

Olivier Levrey · Answer 2 · 2011-05-02T06:17:00

Solution 3

Since gvList.SelectedItems is never changed, its Count will never change, so you will never exit the while loop.

You should explain what you want to do and we will maybe find a solution.

Posted 2-May-11 6:17am

Olivier Levrey

Comments

Kim Togo 2-May-11 12:29pm

My 5. Nice catch!

OriginalGriff · Answer 3 · 2011-05-02T05:25:00

Solution 1

Well several reasons really:

What happens if the selected items don't exactly match your list?
What happens to "b"?
What happens if the first item in gvList is not selected?

Which error did you mean?

Posted 2-May-11 5:25am

OriginalGriff

Comments

Member 7838027 2-May-11 11:32am

it's not possible that a selected item is not on the list because selecteditems are those items in the list whose checkbox is checked.

if the first item is not selected, the index (a) will increment and compare item at that index with the item at index b.

am i right?

OriginalGriff 2-May-11 11:42am

Er: no.
if(gvList.Items[a]==gvList.SelectedItems[a])

Member 7838027 2-May-11 11:44am

i'm sorry for that... i already updated the code.... it was a typo