在 wpf 中设置图像源答案

【问题标题】：set image source in wpf在 wpf 中设置图像源
【发布时间】：2015-06-28 15:45:30
【问题描述】：

当我想 delete old 并设置 old 并设置 new 图像时，我尝试按照代码 set image image source source 并显示旧图片。为什么？

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 = source;
      bitmap.CacheOption = BitmapCacheOption.OnLoad;
      bitmap.EndInit();
      return bitmap;
 }

【问题讨论】：

标签： c# wpf image

【解决方案1】：

试试这个，对我有用。

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

完整的源代码

  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;

        }
    }

Xaml

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

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

【讨论】：

@MasoudAMR 你会试试这个，请为我工作。在调用new Uri 之前，它不会更新源
Binding 在 wpf 中工作得很好，我建议使用 Mvvm Implmentation of Image Change
如何/在哪里使用这个？
MVVM 是主要用于 WPF 、Silverlight 和 WP8 的模式。它将您的 view => View Model => Model 分开。 Mvvm tutorials 。它在可维护性和可扩展性以及测试每一层方面都非常受欢迎。
任何答案都不适合我的问题。