Comparing checklistbox items to array

Question

So, i have a checklistbox that contains string values like:

asdf-432-qwer-vcxz
rewq-123-qwer-vcxz
rety-323-qw65-vcyt
kjhf-232-ouyy-bjkl
...

And i have an array(onlineVaults) that contains some of the same values that in checklistbox like:

rety-323-qw65-vcyt
asdf-432-qwer-vcxz

Now i want to check only those values in checklistbox that are in the array. Others should be unchecked.

for (int i = 0; i < checklistbox.Items.Count; i++)
{
    if (onlineVaults.Contains(checklistbox.Items[i]))
    {
        checklistbox.SetItemChecked(i, true);
    }
}

I have tried it to figure out like this, but it doesn't work. It only checks one value and nothing else. What i should do?

Can you provide a concrete example (have you tried this with the very values given in the question)? Which item remains checked in the end? — O. R. Mapper
– O. R. Mapper, Commented Aug 10, 2015 at 11:26
What is the default state of each checkbox? have you tried adding the else block to your if statement that sets the boxes to unchecked? — Reece Kenney
– Reece Kenney, Commented Aug 10, 2015 at 11:28
@niklang: Well, it doesn't when I try. Are there any event handlers bound to your control, or any non-standard settings? — O. R. Mapper
– O. R. Mapper, Commented Aug 10, 2015 at 11:49
Provide more code please. Where does this onlineVaults came from? Are you absolutely sure that there are values and not nulls there ? Are there multi-threading involved ? — Fabjan
– Fabjan, Commented Aug 10, 2015 at 12:04
@Rubidium37: The SelectionMode property merely controls how many items can be highlighted. At any time, an unlimited number of items can still be checked. Note that the docs even say: "For CheckedListBox objects, multiple selection is not supported. You can set the mode to one item or no items." — O. R. Mapper
– O. R. Mapper, Commented Aug 10, 2015 at 12:50

M. Nasir Javaid · Accepted Answer · 2015-08-11 00:52:54Z

1

Try this

var checklistbox = new List<string>
{
     "asdf-432-qwer-vcxz",
     "rewq-123-qwer-vcxz",
     "rety-323-qw65-vcyt",
     "kjhf-232-ouyy-bjkl"
};
var onlineVaults = new List<string>
{
     "rety-323-qw65-vcyt",
     "asdf-432-qwer-vcxz"
};

for (int i = 0; i < checklistbox.Items.Count; i++)
{
    checklistbox.SetItemChecked(i, onlineVaults.Contains(checklistbox.Items[i]));            
}

EDIT:

To ignore case and trim values, try this

for (int i = 0; i < checklistbox.Items.Count; i++)
{
    checklistbox.SetItemChecked(i, IsValueExist(onlineVaults, checklistbox.Items[i]));            
}

private bool IsValueExist(List<string> list, string value)
{
    return list.Any(x => string.Compare(x.Trim(), value.Trim(), StringComparison.InvariantCultureIgnoreCase) == 0);        
}

edited Aug 11, 2015 at 0:52

answered Aug 10, 2015 at 11:30

M. Nasir Javaid

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5 Comments

niklang Over a year ago

Didn't work, does the same thing that my if else code.

O. R. Mapper Over a year ago

@M.NasserJavaid: Isn't it this method?

M. Nasir Javaid Over a year ago

@niklang Can you see values using debug, is there need to trim values?

niklang Over a year ago

Yes they are ok, values are like this: {D1E8AD81-XXX-4D9C-VFDC-3B7AD146T5DE} @M.NasserJavaid

M. Nasir Javaid Over a year ago

I mean to say, if there are some alphabets case difference or if any item has white space in left or right side then there will be matching issue.

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