Using a dictionary outside of the void its created in

Question

Im unsure about how i can use a dictionary i create when i click a button which mean that i cannot reference to it from within another function. This is probably very basic, but i simply cannot remember how this is done.

This is the button that opens up a file dialog, which then reads each line inside the file, and stores the contents inside the dictionary:

private void button1_Click(object sender, EventArgs e)
{
    OpenFileDialog openFileDialog1 = new OpenFileDialog();
    openFileDialog1.Filter = "Mod Pack Configuration file|*.mcf";
    openFileDialog1.Title = "Load Mod Pack Configuration File";
    openFileDialog1.ShowDialog();

    if (openFileDialog1.FileName != "")
    {
        Dictionary<string, string> loadfile =
        File.ReadLines(openFileDialog1.FileName)
            .Select(line => line.Split(';'))
            .ToDictionary(parts => parts[0], parts => parts[1]);
    }
}

Then afterwards i load a function, that places the loaded files, strings inside different controls within the form. However the below code doesnt work as "loaddfile" is not found:

public void getDefaultSettings()
{
    if (Properties.Settings.Default.modsDestDropDown != "") 
    {
        modsDestDropDown.SelectedIndex = Convert.ToInt32(loadfile['modsDestDropDown']);
    }
}

I could ofcourse write the function inside the button1 click event instead, but since i use this function across the program in other places, it would then give me some trouble later

Can you just make the dictionary global? – Mike Schwartz Jan 27 '14 at 22:31 — Mike Schwartz, Jan 27 '14 at 22:31

score 5 · Accepted Answer · answered Jan 27 '14 at 22:31

Define your dictionary in the class level, outside of your methods like this:

Dictionary<string, string> loadfile;

Then just initialize it in your method:

loadfile = File.ReadLines(openFileDialog1.FileName)
               .Select(line => line.Split(';'))
               .ToDictionary(parts => parts[0], parts => parts[1]);

score 2 · Answer 2 · answered Jan 27 '14 at 22:31

loadFile is currently a local variable only available in the scope of button1_Click. If you want it available in more than one method you should make it a field on your class.

private Dictionary<string, string> loadfile;
private void button1_Click(object sender, EventArgs e)
{
    OpenFileDialog openFileDialog1 = new OpenFileDialog();
    openFileDialog1.Filter = "Mod Pack Configuration file|*.mcf";
    openFileDialog1.Title = "Load Mod Pack Configuration File";
    openFileDialog1.ShowDialog();

    if (openFileDialog1.FileName != "")
    {
        loadfile =
        File.ReadLines(openFileDialog1.FileName)
            .Select(line => line.Split(';'))
            .ToDictionary(parts => parts[0], parts => parts[1]);
    }
}

Using a dictionary outside of the void its created in

2 Answers2