Get Selected Value of SelectedItems in a TextBox (separated with Commas) from MultiSelect ListBox?

问题

Please tell me how can I get ValueMember of ListBox SelectedItems? I have read many tutorials but still I am unable to solve it. Any help will be greatly appreciated.

int c = subjects_Listbox.Items.Count - 1;
for (int i = 0; i >= 0; i--)
{
    if (subjects_Listbox.GetSelected(i))
    {
        txt.Text += subjects_Listbox.SelectedIndices[i].ToString();
        txt.Text += ", ";
    }
}

回答1:

Your for loop is incorrect. Just try this (this iterate through all SelectedIndices of your ListBox and will add them to your TextBox):

foreach (var item in subjects_Listbox.SelectedIndices)
{
     txt.Text += item;
     txt.Text += @", ";
}

Or even better:

txt.Text = string.Join(",", subjects_Listbox.SelectedIndices.Cast<int>());

来源：https://stackoverflow.com/questions/34238374/get-selected-value-of-selecteditems-in-a-textbox-separated-with-commas-from-mu