如何将字符串的换行符更改为空格字符

Question

I have a string like this:

Washington  
Madrid 
Delhi
London

And I want to change it to:

Washington Madrid Delhi London

Replacing the newline characters with space characters.

This is what I tried:

private void button1_Click(object sender, EventArgs e)
{
    //string of cities is recieved from a rich textbox

    String cities;   

    cities = RichTextBox1.Text;


    cities = cities.Replace(System.Environment.NewLine, " ");

    RichTextBox1.Clear();
    RichTextBox1.AppendText(cities);
}

Answer 1

.Net string type is immutable . Your code should be,

cities = cities.Replace(System.Environment.NewLine, " ");

Answer 2

Just use a Regular Expression like this:

var joined = Regex.Replace(cities, @"[\r\n]+", " ")

This will take into account the fact you have carriage returns (or not), line feeds and spaces (possibly tabs too), making sure the output has exactly one space between each word

Answer 3

您的代码无法正常工作，因为您必须使用Replace函数设置 cities对象，如下所示：

cities = ...Your code...