Retrieve checked Items in checkedListBox from text file

Question

I have a text file with one word per line which represents the checkedListBox I have checked previously. Now when the application is re-run I want the checkedListBox items to already be checked, I've tried:

System.IO.StreamReader file = new System.IO.StreamReader(@"checked.txt");
foreach (var checked in file.ReadLine())
{              
        lstCheckBox.SetItemChecked(checked, true);
}

This doesn't seem to work, whilst debugging the application crashes, any ideas where I'm going wrong?

Error:

    InvalidArgument=Value of '97' is not valid for 'index'.
    Parameter name: index

FIXED

foreach (var checked in File.ReadAllLines(@"checked.txt"))
{
    int index = lstCheckBox.Items.IndexOf(checked);

    if (index > 0)
    {
        lstCheckBox.SetItemChecked(index, true);
    }
}

Does the checkboxlist contain at least 98 items? Also, the first argument to `SetItemChecked` is an integer, I don't see you doing any conversion from string. Is this the code in its entirety? — Matthew, Aug 15 '13 at 23:03
@Matthew The list contains 20 items, and this is the entire code for the retrieval yes. — user2684535, Aug 15 '13 at 23:08

score 1 · Accepted Answer · answered Aug 15 '13 at 23:11

1

This is because ReadLine returns a single line, and you're iterating the characters in the line.

string line;
while ((line = file.ReadLine()) != null)
{
    var index = int.Parse(line);
    lstCheckBox.SetItemChecked(checked, true);  
}

Should fix the problem.

Alternatively, you could use the following code instead (not using StreamReader).

foreach (var line in File.ReadAllLines("checked.txt"))
{
    var index = int.Parse(line);
    lstCheckBox.SetItemChecked(checked, true);      
}

answered Aug 15 '13 at 23:11

Matthew

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>var index = int.Parse(line); returns error [Input string was not in a correct format.] – user2684535 Aug 15 '13 at 23:16
What does your file contain? – Matthew Aug 15 '13 at 23:18
A word of what, how does it correspond to your list box? – Matthew Aug 15 '13 at 23:21
The word is the checkedlistbox Item text – user2684535 Aug 15 '13 at 23:23
Check out http://stackoverflow.com/questions/9185770/programatically-check-an-item-in-checkboxlist-where-text-is-equal-to-what-i-want – Matthew Aug 15 '13 at 23:25
Thanks File.ReadAllLines and the linked question got it fixed, cheers. – user2684535 Aug 15 '13 at 23:33

Retrieve checked Items in checkedListBox from text file

1 Answers1