图片和byte[]的互相转换

 1 //图片的"读"操作
 2 //①参数是图片路径:返回Byte[]类型:
 3 //参数是图片的路径
 4 public byte[] GetPictureData(string imagePath){
 5 FileStream fs=new FileStream(imagePath,FileMode.Open);
 6 byte[] byteData=new byte[fs.Length];
 7 fs.Read(byteData,0,byteData.Length);
 8 fs.Close();
 9 return byteData();
10 }
11 //②参数类型是Image对象，返回Byte[]类型
12 //将Image转换成流数据，并保存为byte[]&nbsp;
13 public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto)
14 {
15  MemoryStream mstream = new MemoryStream();
16  imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);
17  byte[] byData = new Byte[mstream.Length];
18  mstream.Position = 0;
19  mstream.Read(byData, 0, byData.Length); mstream.Close();
20  return byData;
21 }
22 //图片的“写”操作
23 //①参数是Byte[]类型，返回值是Image对象
24 public System.Drawing.Image ReturnPhoto(byte[] streamByte)  
25 {  
26  System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);  
27  System.Drawing.Image img = System.Drawing.Image.FromStream(ms);  
28  return img;  
29 }  
30 //②参数是Byte[] 类型，没有返回值（ASP.NET输出图片）
31 public void WritePhoto(byte[] streamByte)  
32 {  
33  // Response.ContentType 的默认值为默认值为“text/html”  
34  Response.ContentType = "image/GIF";  
35  //图片输出的类型有: image/GIF     image/JPEG  
36  Response.BinaryWrite(streamByte);  
37 }