resizeing image . . . .

问题

hi thanks a lot i have one code below in this code ill upload one image . convert it into byte code and store it in database .. and retrive it in gridview .. the thing is before converting it into byte code i want to resize it could u plz tell me what code i should insert here ... thanks a lot .. ...

protected void btnUpload_Click(object sender, EventArgs e)
{
 string strID= txtid.Text.ToString();
 string strImageName = txtName.Text.ToString();
 if (FileUpload1.PostedFile != null && 
     FileUpload1.PostedFile.FileName != "")
  {


   byte[] imageSize = new byte
                 [FileUpload1.PostedFile.ContentLength];

  HttpPostedFile uploadedImage = FileUpload1.PostedFile;
  uploadedImage.InputStream.Read
     (imageSize, 0, (int)FileUpload1.PostedFile.ContentLength);

 // Create SQL Connection 
  SqlConnection con = new SqlConnection("user id=sa;password=Zoomin@123;database=salary_db;server=192.168.1.100");


 // Create SQL Command 

 SqlCommand cmd = new SqlCommand();
 cmd.CommandText = "INSERT INTO image1(ID,ImageName,Image)" +
                   " VALUES (@ID,@ImageName,@Image)";
 cmd.CommandType = CommandType.Text;
 cmd.Connection = con;


 SqlParameter ID = new SqlParameter
                   ("@ID", SqlDbType.VarChar, 50);
 ID.Value = strID.ToString();
 cmd.Parameters.Add(ID);

 SqlParameter ImageName = new SqlParameter
                     ("@ImageName", SqlDbType.VarChar, 50);
 ImageName.Value = strImageName.ToString();
 cmd.Parameters.Add(ImageName);

 SqlParameter UploadedImage = new SqlParameter
               ("@Image", SqlDbType.Image, imageSize.Length);
 UploadedImage.Value = imageSize;
 cmd.Parameters.Add(UploadedImage);
 con.Open();
 int result = cmd.ExecuteNonQuery();
 con.Close();
 if (result > 0)
 lblMessage.Text = "File Uploaded";

 GridView1.DataBind();

 }}

回答1:

You could use the following function:

public void ResizeImage(double scaleFactor, Stream fromStream, Stream toStream)
{
    using (var image = Image.FromStream(fromStream))
    {
        var newWidth = (int)(image.Width * scaleFactor);
        var newHeight = (int)(image.Height * scaleFactor);
        using (var thumbnailBitmap = new Bitmap(newWidth, newHeight))
        using (var thumbnailGraph = Graphics.FromImage(thumbnailBitmap))
        {
            thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
            thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
            thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
            var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
            thumbnailGraph.DrawImage(image, imageRectangle);
            thumbnailBitmap.Save(toStream, image.RawFormat);
        }
    }
}

The name of the parameters should be pretty self-explanatory.

回答2:

Have a look at

Resize an Image C#

来源：https://stackoverflow.com/questions/1932546/resizeing-image

标签

resize-image