让我的组合框替换 .txt 文件中的单词

Question

I have a ComboBox with two resolution (1600x900 and 1280x720), I want them to replace "-screen-width XXXX -screen-height YYY" by the resolution chosen , in my TXT file when I press the "Save and Close" boutton, for the moment I've tried anything because I'm a real beginner at coding, it's my first Program I ever made. Basically, my program will be an easy way to edit launch options for guys who don't know them This is what I have in "InitializeComponent();"

public Window1()
    {
        InitializeComponent();
        listResolution.Add("1600x900");
        listResolution.Add("1280x720");

        widthChoose = 1280;
        heightChoose = 720;
        windowed = true;

        foreach (String item in listResolution)
        {
            ResolutionBox.Items.Add(item);
        }
    }

This is what I have for my "Save and Close" boutton (The text replace doesn't work)

private void SaveClose_Click(object sender, RoutedEventArgs e)
    {
        if (Windowed.IsChecked == true)
            windowed = true;
        else
            windowed = false;

        string text = File.ReadAllText(@"Resources\arguments.txt");
        text = text.Replace("-screen-fullscreen 1", "-screen-fullscreen 0");
        File.WriteAllText("arguments.txt", text);

        this.Close();

And I have no event for my comboBox

private void ResolutionBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

    }

Content of my "arguments.txt"

-screen-fullscreen 0 -screen-width 1600 -screen-height 900

Answer 1

Right before

File.WriteAllText("arguments.txt", text);

Add these :

First we take the selected resolution (not sure the purpose of listResolution there)

var selectedResolution = ResolutionBox.SelectedItem.ToString();

split it to width and height

var split = selectedResolution.Split('x');
widthChoose = split[0];
heightChoose = split[1];

then replace 1600 & 900 with the new values :

text = text.Replace("1600",widthChoose)

continue with height.