MVVM模式下WPF动态绑定展示图片

//属性定义    BitmapImage _ImageSource;    /// <summary>    /// 显示的图标    /// </summary>    public BitmapImage ImageSource    {      get { return _ImageSource; }      set      {        _ImageSource = value;        NotifyOfPropertyChange("ImageSource");      }    }    string _ImagePath;    /// <summary>    /// 显示的图标路径    /// </summary>    public string ImagePath    {      get { return _ImagePath; }      set      {        _ImagePath = value;        NotifyOfPropertyChange("ImagePath");      }    }

//初始化数据//编辑的时候绑定数据public GroupInfoViewModel(sys_Right_Group groupInfo, OperType type)    {      if (type == OperType.Edit || type == OperType.Show)      {        IsAdd = false;        TitleName = "编辑分组";        RightGroup = groupInfo;        ImagePath = groupInfo.ImagePath;         GetImgData(groupInfo.ImagePath);      }    }    /// <summary>    /// 获取图片数据    /// </summary>    /// <param name="imgPath">相对路径</param>    private void GetImgData(string imgPath)    {      if (string.IsNullOrEmpty(imgPath)) return;      try      {                string fileName = System.Environment.CurrentDirectory + imgPath; //获取文件的绝对路径        byte[] buf;        if (!PathToByte(fileName, out buf))        {          MessageHelper.ShowAutoCloseWarning("获取图标失败");          return;        }        ImageSource =ByteToImage(buf);      }      catch (Exception ex)      {        throw ex;      }    }

//界面选择图片按钮事件   /// <summary>    /// 修改图片    /// </summary>    public void ChangedIcon()    {      try      {        OpenFileDialog open = new OpenFileDialog();        open.Filter = string.Format("照片|*.jpg;*.jpeg;*.png;*.gif;*.bmp");        if (open.ShowDialog() == true)        {          var path = open.FileName;          //检查图标目录，绝对路径下面          string NewPath = System.Environment.CurrentDirectory + @"/Images/Tile/Group/";          string newFile = NewPath + Path.GetFileName(path);          if (!System.IO.Directory.Exists(NewPath))          {            System.IO.Directory.CreateDirectory(NewPath);          }          File.Copy(path, newFile, true); //复制文件到目录绝对路径文件夹          FileInfo info = new FileInfo(newFile); //新文件          if (info.Length > MenuViewModel.UserImageMaxLength)          {            MessageHelper.ShowAutoCloseWarning(string.Format("图标不能大于{0}M",              MenuViewModel.UserImageMaxLength / 1024 / 1024));            return;          }          byte[] buf;          if (!PathToByte(path, out buf))          {            MessageHelper.ShowAutoCloseWarning("修改失败");            return;          }          ImageSource = ByteToImage(buf);          ImagePath = @"/Images/Tile/Group/" + Path.GetFileName(path); //显示相对路径        }      }      catch (Exception ex)      {        throw ex;      }    }

//公共帮助方法//把图片文件转换为byte数组 public static bool PathToByte(string path, out byte[] buffer)    {      FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);      try      {        buffer = new byte[fs.Length];        fs.Read(buffer, 0, (int)fs.Length);        return true;      }      catch (Exception ex)      {        buffer = null;        return false;      }      finally      {        if (fs != null)        {          //关闭资源            fs.Close();        }      }          }//把byte数组转化为BitmapImage     public static BitmapImage ByteToImage(byte[] buf)    {      BitmapImage bmp = new BitmapImage();      bmp.BeginInit();      bmp.StreamSource = new MemoryStream(buf);      bmp.EndInit();      return bmp;    }

<Button Grid.Row="0" Grid.Column="0" Content="选择图片" cm:Message.Attach="[Click]=[ChangedIcon()]" Style="{StaticResource BtnOperationStyle}" Height="20" Width="70"></Button>          <Grid Grid.Row="0" Grid.Column="1" Background="LightGray">            <Image Height="120" Width="150" Stretch="Fill" Source="{Binding ImageSource,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></Image>    </Grid>   <Label Grid.Row="1" Grid.Column="0" Style="{StaticResource GridColumnLabelStyle}" Content="路径："></Label><TextBox Grid.Row="1" Grid.Column="1" Style="{StaticResource StyleForTextBox}" Text="{Binding ImagePath,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Height="30" TextAlignment="Center" IsReadOnly="True"></TextBox>