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private void SaveToFile(byte[] value,string filePath)
{ System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.OpenOrCreate);
fs.Write(value, 0, value.Length);
fs.Flush();
fs.Close();
}private byte[] ConvertStreamToByteBuffer(string filePath)
{ System.IO.Stream theStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
int b1;
System.IO.MemoryStream tempStream = new System.IO.MemoryStream();
while ((b1 = theStream.ReadByte()) != -1)
{
tempStream.WriteByte(((byte)b1));
}
return tempStream.ToArray();
} public static byte[] GetsetBinary(DataTable dt)
{ byte[] bArrayResult = null; //用于存放序列化后的数据
dt.RemotingFormat = SerializationFormat.Binary; //指定DataSet串行化格式是二进制
MemoryStream ms = new MemoryStream();//定义内存流对象，用来存放DataSet序列化后的值
IFormatter IF = new BinaryFormatter();//产生二进制序列化格式
IF.Serialize(ms, dt);//串行化到内存中
bArrayResult = ms.ToArray(); // 将DataSet转化成byte[]
ms.Close();
ms.Dispose();
return bArrayResult;
} public DataTable RetrieveDataSet(byte[] binaryData)
{ MemoryStream ms = new MemoryStream(binaryData);//创建内存流
IFormatter bf = new BinaryFormatter();//产生二进制序列化格式
object obj = bf.Deserialize(ms);//反串行化到内存中
//类型检验
ms.Close();
if (obj is DataTable)
{
DataTable dataSetResult = (DataTable)obj;
return dataSetResult;
}
else
{
return null;
}
} public static byte[] GetBytesByImage(System.Drawing.Image image)
{ byte[] photo_byte = null;
using (MemoryStream ms = new MemoryStream())
{
Bitmap bmp = new Bitmap(image);
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
photo_byte = new byte[ms.Length];
ms.Position = 0;
ms.Read(photo_byte, 0, Convert.ToInt32(ms.Length));
bmp.Dispose();
}
return photo_byte;
} //调用方法：DataTable dt = DbHelperSQL.Query(sql);DataTable newDt = dt.Clone();newDt.Columns.Add("photo", System.Type.GetType("System.Byte[]"));
foreach (DataRow dr in dt.Rows)
{
newDt.ImportRow(dr);
System.Drawing.Image img = System.Drawing.Image.FromFile(StudentPhotoPath(dr["PhotoUrl"].ToString()));
img = FixedSize(img, 135, 180);
newDt.Rows[newDt.Rows.Count - 1]["photo"] = GetBytesByImage(img);
img.Dispose();
}byte[] tableByteArray = GetsetBinary(newDt);
SaveToFile(tableByteArray, @"D:\hello.yzd");
byte[] byteArray = ConvertStreamToByteBuffer(@"D:\hello.yzd");
DataTable dt = RetrieveDataSet(byteArray);