读取从文本文件到列表框C＃的所有行

Question

It says I need an String after ReadAllLines(...) Can someone help me setup that.

I don't understand how I'm going to get the text file to ListBox .

private void futureButton4_Click(object sender, EventArgs e)
{
    ofd.Filter = "TXT|* .txt";

    if (ofd.ShowDialog() == DialogResult.OK)
    {
        string[] lines = System.IO.File.ReadAllLines(DialogResult);
        listbox.Items.Add(lines);
    }
}

Answer 1

If you want to add a collection of strings in one pass, use AddRange() instead of Add() . Also, you'll need to reference the FileName property to get the full path of the selected file.

string[] lines = System.IO.File.ReadAllLines(ofd.FileName);

listbox.Items.AddRange(lines);

The call to Add() just ends up calling ToString() on the collection, so all you'll see is the class type, in this case String[] Array .

When you use AddRange() , it calls ToString() on each item in the collection. In the case of a collection of strings, you just see each string. If you were using a custom class you created, you'd have to either override ToString() so something sensible were displayed, or you could use a bit of LINQ in the call to AddRange() , to select the property you wanted displayed.