如何将列表框项目保存在文本文件中？

Question

I'm trying to save ListBox items in text file. The Items I have added from properties:

My code is:

private void button1_Click(object sender, EventArgs e)
        {
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                using (FileStream S = File.Open(saveFileDialog1.FileName, FileMode.CreateNew))
                    using (StreamWriter st = new StreamWriter(S))
                        foreach (string aa in listBox1.Items)
                            st.WriteLine(listBox1.Items);
            }
        }

The output in text file is: System.Windows.Forms.ListBox+ObjectCollection

Answer 1

Just use the aa into writeLine

               if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    using (FileStream S = File.Open(saveFileDialog1.FileName, FileMode.CreateNew))
                    {
                        using (StreamWriter st = new StreamWriter(S))
                         {
                            foreach (var aa in listBox1.Items)
                                st.WriteLine(aa.ToString());
                         }
                    }
                }

Answer 2

As @davidsbro mentioned, you want aa to be in the st.Writeline as that is the actual string. listBox1.Items gives a class which Writeline can't handle as it doesn't know what you would want from Items . So it outputs the name which is the result you got. If you want all the properties and other information about that Items class you would have to serialize it and write to the file.