MVVM模式下WPF动态绑定展示图片_实用技巧_

 //属性定义 BitmapImage _ImageSource; /// 
 /// 显示的图标 /// 
 public BitmapImage ImageSource { get { return _ImageSource; } set { _ImageSource = value; NotifyOfPropertyChange("ImageSource"); } } string _ImagePath; /// 
 /// 显示的图标路径 /// 
 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); } } /// 
 /// 获取图片数据 /// 
 /// 相对路径 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 /// 
 /// 修改图片 /// 
 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; }