Microsoft.Win32.OpenFileDialog图片上传Multiselect多张Filter验证

上传图片的代码：
调用OpenFileDialog关键字；

属性Multiselect：是否允许多选图片；
属性Filter：验证上传的图片类型

private void btnFile_Click(object sender, RoutedEventArgs e)
{
lstBytes.Clear();
Stream photo = null;
int Length;
Microsoft.Win32.OpenFileDialog openFile = new Microsoft.Win32.OpenFileDialog();
openFile.Multiselect = true;
openFile.Filter = “ALL Image Files|.”;
if ((bool)openFile.ShowDialog())
{
if ((photo = openFile.OpenFile()) != null)
{
Length = (int)photo.Length;
byte[] bytes = new byte[Length];
photo.Read(bytes, 0, Length);
lstBytes.Add(bytes);
BitmapImage images = new BitmapImage(new Uri(openFile.FileName));
img_photo.Source = images;
txt_Load.Text = openFile.FileName;

            }
        }
        else
        {
            MessageBox.Show("图片未选择");
        }
    }