PreferencesWindow.cs

using Amaoto;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Security.Policy;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using static TestProject.SongData;

namespace TestProject
{
    public partial class PreferencesWindow : Form
    {
        bool changed_backpic;

        public PreferencesWindow()
        {
            InitializeComponent();
        }

        public void Enable()
        {
            label2.Text = Properties.Settings.Default.BackgroundPicPath;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Properties.Settings.Default.Reload();
            this.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ((MainWindow)this.Owner).BackgroundImage = Image.FromFile(Properties.Settings.Default.BackgroundPicPath);
            Properties.Settings.Default.Save();
            this.Close();
        }

        private void Button_MusicChoose_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog openFileDialog = new OpenFileDialog())
            {
                openFileDialog.Filter = "PNGファイル (*.png)|*.png|JPGファイル (*.jpg)|*.jpg";
                openFileDialog.FilterIndex = 1;
                openFileDialog.RestoreDirectory = true;

                if (openFileDialog.ShowDialog() == DialogResult.OK)
                {
                    if (Properties.Settings.Default.BackgroundPicPath == openFileDialog.FileName) return;

                    Properties.Settings.Default.BackgroundPicPath = openFileDialog.FileName;
                    label2.Text = openFileDialog.FileName;
                    label1.Text = "背景画像*";
                    changed_backpic = true;
                }
            }
        }
    }
}