c# winform listbox adds system.collection to listbox

Question

to whom it may respond to , we have 2 listboxes that use dictionaries as datasource. The code to swap element between textboxes is as :

private void btnSrc2Trg_Click(object sender, EventArgs e)
{
    if (lbxSourceSite.Items.Count > 0 ) {
        try { 
            string[] item = lbxSourceSite.Items[lbxSourceSite.SelectedIndex].ToString().Replace("[","").Split(',');
            dctTargetsites.Add(item[0], item[1]);
            dctSites.Remove(item[0]);
            lbxSourceSite.DataSource = null;
            lbxSourceSite.DataSource = new BindingSource(dctSites,null);
            lbxSourceSite.DisplayMember = "Key";
            lbxSourceSite.ValueMember = "Value";
            lbxTargetSite.DataSource = null;
            lbxTargetSite.DataSource =  new BindingSource(dctTargetsites, null);
            lbxTargetSite.DisplayMember = "Key";
            lbxTargetSite.ValueMember = "Value";
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.GetBaseException().Message.ToString());
        }
    }

}

private void btnTrg2Src_Click(object sender, EventArgs e)
{
    if (lbxTargetSite.Items.Count > 0 ) {
        try{
            string[] item = lbxTargetSite.Items[lbxTargetSite.SelectedIndex].ToString().Replace("[", "").Split(',');
            dctSites.Add(item[0], item[1]);
            dctTargetsites.Remove(item[0]);

            lbxTargetSite.DataSource = null;
            lbxTargetSite.DataSource = new BindingSource(dctTargetsites, null);
            lbxTargetSite.DisplayMember = "Key";
            lbxTargetSite.ValueMember = "Value";

            lbxSourceSite.DataSource = null;
            lbxSourceSite.DataSource = new BindingSource(dctSites, null);
            lbxSourceSite.DisplayMember = "Key";
            lbxSourceSite.ValueMember = "Value";
        }catch(Exception ex){
            MessageBox.Show(ex.GetBaseException().Message.ToString());              
        }
    }
}

After adding the last element to target textbox and removing from source textbox (or vice versa) , there an element as displayed as "system.collection" , it might be related to re-binding dictionaries as datasources after operation, how can I get rid of it? Or any other proper method to use dictionaries for listbox is welcomed, Thank you for your concern

Answer 1

The displayed element "system.collection" may occur becaus you are using

string[] item = lbxSourceSite.Items[lbxSourceSite.SelectedIndex].ToString().Replace("[","").Split(',');

the ToString() method will return you the name of the data type of the selected item -> system.collection.

You could use:

string[] item = lbxSourceSite.Items[lbxSourceSite.SelectedIndex].Text.Replace("[","").Split(',');

or even:

string[] item = lbxSourceSite.Items[lbxSourceSite.SelectedIndex].Value.ToString().Replace("[","").Split(',');

You have to change this in both listboxes :)