. Net binary image reading and storage upload image to database binary

Net Binary Image Storage and reading methods are as follows:

. Net binary image storage: When storing images in binary format, you must set the fields in the database to the image data type (SQL Server). the stored data is byte [].

1. the parameter is the image path: returned byte [] type:

2. Public Byte[] Getpicturedata (StringImagePath)
4. {
6. /**///// Open the file stream based on the path of the image file and save itByte[]
8. Filestream FS =NewFilestream (ImagePath, filemode. Open );// It Can Be Another overload method 
10. Byte[] Bydata =New Byte[Fs. Length];
12. FS. Read (bydata, 0, bydata. Length );
14. FS. Close ();
16. ReturnBydata;
18. }

2. If the parameter type is an image object, the returned byte [] type is:

2. Public Byte[] Photoimageinsert (system. Drawing. Image imgphoto)
4. {
6. // Convert the image into streaming data and save it as byte [] 
8. Memorystream mstream =NewMemorystream ();
10. Imgphoto. Save (mstream, system. Drawing. imaging. imageformat. BMP );
12. Byte[] Bydata =NewByte [mstream. Length];
14. Mstream. Position = 0;
16. Mstream. Read (bydata, 0, bydata. Length );
18. Mstream. Close ();
20. ReturnBydata;
22. }

Now, we can convert the image into a byte [] object through the above method, then, the object is saved to the database, and the binary format of the image is saved to the database. Next I will talk about how to read images from the database. In fact, this is the opposite process.

. Net binary image reading: Convert the corresponding fields into byte []: byte [] bt = (byte []) xxxx

1. the parameter is of the byte [] type, and the returned value is an image object:

2. PublicSystem. Drawing. Image returnphoto (Byte[] Streambyte)
4. {
6. System. Io. memorystream MS =NewSystem. Io. memorystream (streambyte );
8. System. Drawing. Image IMG = system. Drawing. image. fromstream (MS );
10. ReturnIMG;
12. }

2. the parameter is of the byte [] type and has no return value. This is for Asp.net to output the image to the webpage (response. binarywrite)

2. Public VoidWritephoto (Byte[] Streambyte)
4. {
6. // The default value of response. contenttype is "text/html" 
8. Response. contenttype ="Image/GIF";
10. // Image output types: image/GIF image/JPEG 
12. Response. binarywrite (streambyte );
14. }

Supplement:

For the value of response. contenttype, in addition to the image type, there are other types:

1. Response. contenttype ="Application/MSWord";
2. Response. contenttype ="Application/X-Shockwave-flash";
3. Response. contenttype ="Application/vnd. MS-excel";

In addition, different output types can be used for different formats:

2. Switch(Dataread ("Document_type"))
4. {
6. Case "Doc":
8. Response. contenttype ="Application/MSWord";
10. Case "SWF":
12. Response. contenttype ="Application/X-Shockwave-flash";
14. Case "Xls":
16. Response. contenttype ="Application/vnd. MS-excel";
18. Case "GIF":
20. Response. contenttype ="Image/GIF";
22. Case "Jpg":
24. Response. contenttype ="Image/JPEG";
26. }

The preceding describes common methods for storing and reading. net binary images.