Question

当我想set image并设置{{1}时，我会尝试将代码关注到source中的WPF delete old } {}，new但rightly并显示旧图片。为什么呢？

image not refresh

Answer 1

试试这个，适合我。

        var bitmap = new BitmapImage();
        bitmap.BeginInit();
        bitmap.UriSource = new Uri(source.AbsoluteUri);
        bitmap.EndInit();
        return bitmap;

完整源代码

  public MainWindow()
    {
        InitializeComponent();

        Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();

        string subpath = "UserProfile";
        Directory.CreateDirectory(subpath);


        // Set filter for file extension and default file extension 
        dlg.DefaultExt = ".jpg";
        dlg.Filter = "jpeg Files (*.jpg)|*.jpg";
        // Display OpenFileDialog by calling ShowDialog method 
        if (dlg.ShowDialog() == true)
        {
            string fileName = "pic" + txtEmployeeID.Text + ".jpg";
            string newPath = "\\" + subpath + "\\" + fileName;

            if (File.Exists(Directory.GetCurrentDirectory() + "\\" + newPath))
            {
                imgUser.Source = null;
                File.Delete(Directory.GetCurrentDirectory() + newPath);
            }

            File.Copy(dlg.FileName.ToString(), Directory.GetCurrentDirectory() + "\\" + newPath);

            ImageSource imageSrc = BitmapFromUri(new Uri(Directory.GetCurrentDirectory() + newPath));
            imgUser.Source = imageSrc;

        }





    }

    public static ImageSource BitmapFromUri(Uri source)
    {
        var bitmap = new BitmapImage();
        bitmap.BeginInit();
        bitmap.UriSource = new Uri(source.AbsoluteUri);
        bitmap.CacheOption = BitmapCacheOption.OnLoad;
        bitmap.EndInit();
        return bitmap;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();

        string subpath = "UserProfile";
        Directory.CreateDirectory(subpath);


        // Set filter for file extension and default file extension 
        dlg.DefaultExt = ".jpg";
        dlg.Filter = "jpeg Files (*.jpg)|*.jpg";
        // Display OpenFileDialog by calling ShowDialog method 
        if (dlg.ShowDialog() == true)
        {
            string fileName = "pic" + DateTime.Now.Millisecond + ".jpg";
            string newPath = "\\" + subpath + "\\" + fileName;

            if (File.Exists(Directory.GetCurrentDirectory() + "\\" + newPath))
            {
                imgUser.Source = null;
                // File.Delete(Directory.GetCurrentDirectory() + newPath);
            }

            File.Copy(dlg.FileName.ToString(), Directory.GetCurrentDirectory() + "\\" + newPath);

            ImageSource imageSrc = BitmapFromUri(new Uri(Directory.GetCurrentDirectory() + newPath));
            imgUser.Source = imageSrc;

        }
    }

的Xaml

 <Image x:Name="imgUser" Margin="88,70,49,72"> </Image>

    <Button Margin="0,277,425,0" Click="Button_Click"> </Button>

在wpf中设置图像源

1 个答案: