SettingWindow.cs


namespace PrizeDrawTool
{
    public partial class SettingWindow : Form
    {
        MainWindow mainWindow;
        public SettingWindow(MainWindow mw)
        {
            InitializeComponent();
            mainWindow = mw;
        }

        private void ClearBannerBtn_Click(object sender, EventArgs e)
        {
            DeleteBannerImage();
        }

        private void BannerSettingBtn_Click( object sender, EventArgs e ) 
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "jpeg files (*.jpg, *.jpeg) | *.jpg; *.jpeg | PNG files (*.png) | *.png";
            if (ofd.ShowDialog() == DialogResult.OK)         //弹出窗口选择文件
            {
                string fileName = ofd.FileName;
                ofd.Dispose();
                DeleteBannerImage();
                string filePath = $".\\bannerimg{Path.GetExtension(fileName)}";
                File.Copy(fileName, filePath, overwrite: true);
                var img = Image.FromFile(filePath);
                mainWindow.BannerPictureBox.Image = img;
            }
        }

        private void DeleteBannerImage()
        {
            if (mainWindow.BannerPictureBox.Image != null)
            {
                mainWindow.BannerPictureBox.Image.Dispose();
                mainWindow.BannerPictureBox.Image = null;
            }

            // 删除文件
            string[] fileNames = { ".\\bannerimg.jpg", ".\\bannerimg.jpeg", ".\\bannerimg.png" };
            foreach (var fileName in fileNames)
            {
                if (File.Exists(fileName))
                {
                    try
                    {
                        File.Delete(fileName);
                        mainWindow.BannerPictureBox.Image = Properties.Resources.default_banner;
                    }
                    catch (IOException ex)
                    {
                        MessageBox.Show($"无法删除文件 {fileName}，原因：{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }
    }
}