如何从C＃列表中删除空行 <string> ？

Question

I am trying to create a routine in C# that sorts a list added to a Multi-Line text box. Once that is done, there is an option to remove all blank lines. Can someone tell me how I would go about doing this? here is what I have so far, but it doesn't work at all when I select the box and click sort:

private void button1_Click(object sender, EventArgs e)
{
    char[] delimiterChars = { ',',' ',':','|','\n' };
    List<string> sortBox1 = new List<string>(textBox2.Text.Split(delimiterChars));

    if (checkBox3.Checked) //REMOVE BLANK LINES FROM LIST
    {
        sortBox1.RemoveAll(item => item == "\r\n");
    }

    textBox3.Text = string.Join("\r\n", sortBox1);
}

Answer 1

If you're splitting the string on '\\n' , sortBox1 won't contain a string containing \\n . I would just use String.IsNullOrWhiteSpace , though:

sortBox1.RemoveAll(string.IsNullOrWhiteSpace);

Answer 2

You forgot to sort the lines:

sortBox1.Sort();

A blank line is not "\\r\\n" , that is a line break. Blank lines are empty strings:

sortBox1.RemoveAll(item => item.Length == 0);

You can also remove the blank lines when splitting the string:

private void button1_Click(object sender, EventArgs e) {
    char[] delimiterChars = { ',',' ',':','|','\n' };

    StringSplitOptions options;
    if (checkBox3.Checked) {
        options = StringSplitOptions.RemoveEmptyEntries;
    } else {
        options = StringSplitOptions.None;
    }

    List<string> sortBox1 = new List<string>(textBox2.Text.Split(delimiterChars, options));
    sortBox1.Sort();
    textBox3.Text = string.Join("\r\n", sortBox1);
}