I had managed to let users upload the image and save into the database and the folder. I need to generate thumbnail from the image and save into the database and the folder as well. But there is some error with generating thumbnail. Can someone help with me with it? Thank you
protected void Button1_Click(object sender, EventArgs e)
{
//Get Filename from fileupload control
string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
//Save images into Images folder
FileUpload1.SaveAs(Request.MapPath("/Images/uploaded/" + filename));
//Getting dbconnection from web.config connectionstring
SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());
using (SqlDataAdapter adapter = new SqlDataAdapter("select ImageName from Images", connection))
//Open the database connection
{
DataTable dt = new DataTable();
adapter.Fill(dt);
DataList1.DataSource = dt;
DataList1.DataBind();
}
connection.Open();
//Query to insert images path and name into database
SqlCommand cmd = new SqlCommand("Insert into Images(ImageName) values(@ImageName)", connection);
//Passing parameters to query
cmd.Parameters.AddWithValue("@ImageName", filename);
cmd.ExecuteNonQuery();
//Close dbconnection
connection.Close();
string strImage = FileUpload1.FileName.ToString();
if(FileUpload1.HasFile)
{
strImage = FileUpload1.FileName.ToString();
//check whether the file exists or not
if (!File.Exists(Request.MapPath("/Images/uploaded/") + strImage)) //testing
{
//create a new file name with grid
strImage = Guid.NewGuid().ToString().Substring(0,8) + strImage.Substring(strImage.IndexOf('.'));
}
//save the file
FileUpload1.SaveAs(Request.MapPath("/Images/uploaded/") + strImage); //testing
// create an image object, using the filename we just retrieved
System.Drawing.Image image = System.Drawing.Image.FromFile(Request.MapPath("/Images/uploaded/"));
// create the actual thumbnail image
System.Drawing.Image thumbnailImage = image.GetThumbnailImage(64, 64, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
// make a memory stream to work with the image bytes
MemoryStream imageStream = new MemoryStream();
// put the image into the memory stream
thumbnailImage.Save(imageStream, System.Drawing.Imaging.Imageformat.Jpeg);
}
}Error message - The name 'ThumbnailCallback' does not exist in the current context.
The type or namespace name 'Imageformat' does not exist in the namespace 'System.Drawing.Imaging' (are you missing an assembly reference?).
Do I need to create a folder to store the thumbnail?
