[Original] how to process images in ASP. NET web applications

 

Regular, direct analysisCode

First, create a table. The field type is image.

Normally, you will find that there is no way to store the image, because the length is 50 and cannot be changed. A single image is usually more than 1000

The length of the image data type is 16. When I save a graph, the maximum size of the graph can be about 30 kb. A large graph cannot be saved at all. I want to change its length, but it cannot.
Run the following statement:

Sp_tableoption n 'mytable', 'text in row', and '123456' are effective only when this image type data is executed.

Second, convert the file to a byte array of binary data.

Convert files into binary data
Public static byte [] picturefiletobyte (string picfilepath)
{
Filestream FS = new filestream (picfilepath, filemode. Open, fileaccess. Read );
Byte [] bytephoto = new byte [fs. Length];
FS. Read (bytephoto, 0, (INT) fs. Length );
FS. Close ();
Return bytephoto;
}

 

The image is saved to the database.

 

Read

Create an image control, image. imageurl = image. aspx? Id = 2002

2002 is the row ID of the table storing images in the database,

Image. aspx

Protected void page_load (Object sender, eventargs E)
{
String guid = request. querystring ["ID"];
If (guid! = NULL)
{
Response. clearcontent ();
Response. contenttype = "image/JPEG ";
Byte [] DATA = utility. Picture (guid); read binary data bytes
Response. binarywrite (byte []) data );
}

}

 

In this way, you can.

If you have any questions, please leave a message.