如何用字符串分隔的逗号填充 C# 列表框

Question

I have a string that separated by comma like this:

"test1,test2,test3"

and i want to convert those string to list with folowing code:

    private void convertToList()
    {
        try{
            List<string> myList = occ.Split(',').ToList();
            listBox1.Items.Add(myList);
        }catch(Exception e){
            MessageBox.Show(e.Message);
        }
        
    }

I think that code will convert the string into a list and add it into a Listbox, instead, it shows only "collection"(yes only show the word "collection", nothing more) not the actual list. why that's happened? can you tell me what's the right code?

Answer 1

Well, Add adds a single item which is a List<string> in your case. What should ListBox show for this? Collection seems to be a good enough solution. If you want to add entire collection in one go , try AddRange :

listBox1.Items.AddRange(occ.Split(','));

If you insist on Add , you have to loop in order to Add each item of the collection:

// To stop unwanted redrawing after each item addition
listBox1.BeginUpdate();

try {
  foreach (var item in occ.Split(','))
    listBox1.Items.Add(item);
}
finally {
  listBox1.EndUpdate();
}