WPF bmp和二进制转换

FileStream fs = File.OpenRead(filepath); //filepath文件路径  
 Byte[] tempBuff = new Byte[fs.Length];  
 fs.Read(tempBuff, 0, tempBuff.Length);  

 BitmapImage BI = new BitmapImage();  
 BI.BeginInit();  
 BI.StreamSource = new MemoryStream(bufPic);  //bufPic是图片二进制，byte类型
 BI.EndInit(); 
 image_emp.Source = BI;//image_emp是图片控件