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Editor to share with you how ASP.NET uploads pictures and generates thumbnails with copyright information, I believe most people do not know much about it, so share this article for your reference. I hope you will learn a lot after reading this article. Let's learn about it together.

The code is as follows:

Void Page_Load (Object sender, EventArgs e) {if (! Page.IsPostBack) {ImgPreview.Visible=false;}} void GetThumbnailImage (int width,int height,string strInfo,int left,int right) {string file= "Uploads/" + uploadFile.PostedFile.FileName.Substring (uploadFile.PostedFile.FileName.LastIndexOf ('\\) + 1); string newfile= "Uploads/" + uploadFile.PostedFile.FileName.Substring (uploadFile.PostedFile.FileName.LastIndexOf ('\') + 1) + ".jpg"; string strAdd=strInfo System.Drawing.Image oldimage = System.Drawing.Image.FromFile (Server.MapPath (file)); System.Drawing.Image thumbnailImage = oldimage.GetThumbnailImage (width, height,new System.Drawing.Image.GetThumbnailImageAbort (ThumbnailCallback), IntPtr.Zero); Response.Clear (); Bitmap output=new Bitmap (thumbnailImage); Graphics g=Graphics.FromImage (output); g.DrawString (strAdd,new Font ("Courier New", 14), new SolidBrush (Color.Red), left,right); output.Save (Server.MapPath (newfile), System.Drawing.Imaging.ImageFormat.Jpeg) Response.ContentType = "image/gif"; ImgPreview.Visible=true; ImgPreview.ImageUrl=newfile;} bool ThumbnailCallback () {return true;} void Button_Click (object sender, EventArgs e) {int width,height,left,right; string strAddInfo=txtAddInfo.Text; width=Int32.Parse (txtWidth.Text); height=Int32.Parse (txtHeight.Text); left=Int32.Parse (txtLeft.Text); right=Int32.Parse (txtRight.Text); if (! (uploadFile.PostedFile.ContentLength > 0)) {lblErrInfo.Text= "No file selected" } else {string path = Server.MapPath (". / Uploads/" + uploadFile.PostedFile.FileName.Substring (uploadFile.PostedFile.FileName.LastIndexOf ('\') + 1)); if (File.Exists (path)) {lblErrInfo.Text= "already has a file with the same name";} else {uploadFile.PostedFile.SaveAs (path); GetThumbnailImage (width,height,strAddInfo,left,right);}

Width:100 height:150

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