asp.net picture upload Example

  Site backstage all need to have the function of uploading pictures, the following example is the implementation of the picture upload. Disadvantage: The picture uploaded to this server, not suitable for a large number of picture upload

First, picture upload, code as follows: Xxx.aspx   code as follows:  <td class= "Style1" >                  <asp:fileupload id= "FileUpload1" runat= "server"  />               &N Bsp <asp:button id= "Button1" runat= "server" text= "Upload general picture" onclick= "Button1_Click"/>              </td>             <TD class= "Style3" >      & nbsp           <asp:image id= "Image1" runat= "Server" height= "200px" width= "200px"/>  &nbs P           </td>     Xxx.aspx.cs code as follows:  protected void Button1_Click (object s Ender, EventArgs E)         {            for (int i = 0; i < Request . Files.count; i++)             {                Httppostedfile fi Le =Request.files[i];                 if (file. ContentLength > 0)                 {                    if (file. Contenttype.contains ("image/"))                     {    &NBS P                   using (System.Drawing.Image img = System.Drawing.Image.From Stream (file. InputStream)                         {      & nbsp                     String FileName = System.IO.Path.GetFileName (file. FileName);                             string[] Splitfilename = Filename.split ('. ');                             String atterfilename = DateTime.Now.ToString ("YYYMMDDHHMMSS") + "." + splitfilename[1];                             img Save (Server.MapPath ("/upload/" + atterfilename));                               this. Image1.imageurl = "upload/" + atterfilename;                                   & nbsp        }                     else     &NB Sp               {                    & nbsp   Response.Write (' <script>alert (' The file is not a picture format! ');</script> ");                                   & nbsp }     &NBSp           else                 {      &NB Sp             Response.Write ("<script>alert (' Please select picture to upload ');</script>");                              }        }       Second, add text watermark image upload, code as follows: Xxx.aspx   code as follows:  <td class= "Style1" >  &nb Sp               <asp:fileupload id= "FileUpload2" runat= "server"/>     &N Bsp           <asp:button id= "Button2" runat= "server" text= "Upload text picture" onclick= "button2_click"/ >              </td>             <TD>&NBSP ;                 <asp:image id= "Image2" runat= "Server" height= "200px" width= "200 PX "/>              </td>     Xxx.aspx.cs code as follows:  protected void Button2_Click (object sender, EventArgs e)         {            for (int i = 0; i < reques T.files.count; i++)             {                Httppostedfile fi Le = Request.files[i];                 if (file. ContentLength > 0)                 {                    if (file. Contenttype.contains ("image/"))                     {    &NBS P                   using (System.Drawing.Image img = System.Drawing.Image.From Stream (file. InputStream)                         {                            using (Graphics g = Graphics.fromimag E (IMG))                             {                                g.drawstring ("My Pictures", new Font ("XXFarEastFont-Arial", brushes.red, 0, 0);                            }       & nbsp                     String FileName = System.IO.Path.GetFileName (file. FileName);                             string[] Splitfilename = Filename.split ('. ');                             string atterfilename = D AteTime.Now.ToString ("Yyymmddhhmmss") + "." + splitfilename[1];   &nbsp                         img Save (Server.MapPath ("/upload/" + atterfilename));                             this. Image2.imageurl = "upload/" + atterfilename;                                   & nbsp        }                     else     &NB Sp               {                    & nbsp   Response.Write (' <script>alert (' The file is not a picture format! ');</script> ");                                   & nbsp }                 else                 {&nbsp                   Response.Write ("<script>alert (' Please select the picture to upload") </ Script> ");                              }        }       Third, add picture watermark image upload, code as follows: Xxx.aspx     Code as follows:  <td class= "Style1" >&nbs P                 <asp:fileupload id= "FileUpload3" runat= "server"/>   &N Bsp             <asp:button id= "Button3" runat= "server" text= "Upload watermark Picture" onclick= "button3_ Click "/>              </td>             <td& gt;                  <asp:image id= "Image3" runat= "Server" height= "200px" Width= "200px"/>              </td>     Xxx.aspx.cs code is as follows: protected void BuTton3_click (object sender, EventArgs e)         {            for (int i = 0; i < Request.Files.Count; i++)             {                Httppostedfile fi Le = Request.files[i];                 if (file. ContentLength > 0)                 {                    if (file. Contenttype.contains ("image/"))                     {    &NBS P                   String fileName = file. FileName;                         using (System.Drawing.Image img = Syst Em. Drawing.Image.FromStream (file. InputStream)                         {                             using (system.drawing.i Mage Imgwater = System.Drawing.Image.FromFile (Server.MapPath ("/img/czlogo.jpg"))           & nbsp                 {                  & nbsp             using (Graphics g = Graphics.fromimage (img))                                 {            & nbsp                       G.drawimage (imgwater, 0, 0);                                }   & nbsp                             string[] Splitfilename = Filename.split ('. ');                                 string Att Erfilename = DateTime.Now.ToString ("YYYMMDDHHMMSS") + "." + splitfilename[1];                                 img Save (Server.MapPath ("/upload/" + atterfilename));                                 this. Image3.imageurl = "upload/" + atterfilename;                            }       & nbsp                                   & nbsp }                     else             &NB Sp       {                  &NBsp     Response.Write (' <script>alert (' This file is not a picture format! ');</script> ");                                   & nbsp }                 else                 {& nbsp                   Response.Write ("<script>alert (' Please select the picture to upload") </ Script> ");                            }        }   IV, upload image condensed map, code as follows: Xxx.aspx code as follows:  <td class= "Style1" >                  <asp:fileupload id= "FileUpload4" runat= "server"/>             &N Bsp   <asp:button id= "Button4" runat= "server" text= "upload condensed picture" onclick= "Button4_Click"/>              </td>            <td>                  <asp : Image id= "Image4" runat= "Server" height= "200px" width= "200px"/>              </ td>     Xxx.aspx.cs code is as follows:  protected void Button4_Click (object sender, EventArgs e)         {            for (int i = 0; i < Request.Files.Count i++)             {                Httppostedfile file = Request.files[i]; &nb Sp               if (file. ContentLength > 0)                 {                    if (file. Contenttype.contains ("image/"))                     {    &NBSP ;             &NBSp       using (System.Drawing.Image img = System.Drawing.Image.FromStream (file. InputStream)                         {      & nbsp                     using (System.Drawing.Image imgthumb = new Bitmap (20 0))                             {                                using (Graphics g = Gra Phics. FromImage (Imgthumb))                             &NB Sp   {                                & nbsp   G.drawimage (IMG, new Rectangle (0, 0, Imgthumb.width, imgthumb.height), new Rectangle (0, 0, IMG). Width, IMG. Height), GraphicsUnit.Pixel);                                {    & nbsp                           String fileName = file. FileName;                                 string[] S Plitfilename = Filename.split ('. ');                                 string Att Erfilename = DateTime.Now.ToString ("YYYMMDDHHMMSS") + "." + splitfilename[1];                                 img Save (Server.MapPath ("/upload/" + atterfilename));                                 this. Image4.imageurl = "upload/" + atterfilename;                             {                        {                   }                     Else                     {      &N Bsp                 Response.Write (' <script>alert (' This file is not a picture format! ');</script> ");                                   & nbsp }                 else                 {& nbsp                   Response.Write ("<script>alert (' Please select the picture to upload") </ Script> ");                            }     &nbsp    }