MVVM模式下WPF動態綁定展示圖片

//屬性定義
 BitmapImage _ImageSource;
 /// <summary>
 /// 顯示的圖標
 /// </summary>
 public BitmapImage ImageSource
 {
 get { return _ImageSource; }
 set
 {
 _ImageSource = value;
 NotifyOfPropertyChange("ImageSource");
 }
 }

 string _ImagePath;
 /// <summary>
 /// 顯示的圖標路徑
 /// </summary>
 public string ImagePath
 {
 get { return _ImagePath; }
 set
 {
 _ImagePath = value;
 NotifyOfPropertyChange("ImagePath");
 }
 }

//初始化數據
//編輯的時候綁定數據
public GroupInfoViewModel(sys_Right_Group groupInfo, OperType type)
 {
 if (type == OperType.Edit || type == OperType.Show)
 {
 IsAdd = false;
 TitleName = "編輯分組";
 RightGroup = groupInfo;
 ImagePath = groupInfo.ImagePath; 
 GetImgData(groupInfo.ImagePath);
 }
 }
 /// <summary>
 /// 獲取圖片數據
 /// </summary>
 /// <param name="imgPath">相對路徑</param>
 private void GetImgData(string imgPath)
 {
 if (string.IsNullOrEmpty(imgPath)) return;
 try
 {
 
 string fileName = System.Environment.CurrentDirectory + imgPath; //獲取文件的絕對路徑
 byte[] buf;
 if (!PathToByte(fileName, out buf))
 {
 MessageHelper.ShowAutoCloseWarning("獲取圖標失敗");
 return;
 }
 ImageSource =ByteToImage(buf);
 }
 catch (Exception ex)
 {
 throw ex;
 }
 }

//界面選擇圖片按鈕事件
 /// <summary>
 /// 修改圖片
 /// </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;
 //檢查圖標目錄，絕對路徑下面
 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); //復制文件到目錄絕對路徑文件夾
 FileInfo info = new FileInfo(newFile); //新文件
 if (info.Length > MenuViewModel.UserImageMaxLength)
 {
 MessageHelper.ShowAutoCloseWarning(string.Format("圖標不能大于{0}M",
 MenuViewModel.UserImageMaxLength / 1024 / 1024));
 return;
 }
 byte[] buf;
 if (!PathToByte(path, out buf))
 {
 MessageHelper.ShowAutoCloseWarning("修改失敗");
 return;
 }
 ImageSource = ByteToImage(buf);
 ImagePath = @"\Images\Tile\Group\" + Path.GetFileName(path); //顯示相對路徑

 }
 }
 catch (Exception ex)
 {

 throw ex;
 }
 }

//公共幫助方法

//把圖片文件轉換為byte數組
 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)
 {
 //關閉資源 
 fs.Close();
 }
 }
 
 }

//把byte數組轉化為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="選擇圖片" 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="路徑："></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>