就是那个上传的。按实际上传时的文件名称保存（不在是test.jpg了）图片可以改大小，图上写字（可选

2024-07-21 02:27:57

字体：大中小

来源：转载

供稿：网友

<%@ page language="c#" debug="true" trace="true"%>
<%@ import namespace="system.io" %>
<%@ import namespace="system.drawing" %>
<%@ import namespace="system.drawing.imaging" %>
<html>
<script runat =server>
      void uploadbtn_click(object sender, eventargs e) {
         string filename;
         string filename1;
         string[] filename2;
         int q;
         filename=uploadfile.postedfile.filename ;
         filename2=filename.split(new char[] {'//'});
         q=filename2.getupperbound(0);
         filename1=filename2[q];
         dis.text="上传文件名："+filename1+"<br>";
         uploadfile.postedfile.saveas(server.mappath(filename1));
         imageeditor.visible = true;
         dis.text+="文件大小："+uploadfile.postedfile.contentlength+"字节数";
         image1.src=filename1;
      }
      void updatebtn_click(object sender, eventargs e) {
         string filename1;
         filename1=image1.src;
         system.drawing.image image = system.drawing.image.fromfile(server.mappath(filename1));
         system.drawing.image newimage = new bitmap(image.width, image.height, pixelformat.format32bpprgb);
         graphics g = graphics.fromimage(newimage);
         g.drawimage(image,0,0,image.width,image.height);
         font f = new font(fonttype.selecteditem.text, int32.parse(fontsize.selecteditem.text));
         brush b = new solidbrush(color.red);
         g.drawstring(caption.text, f, b, 10, 140);
         g.dispose();
         system.drawing.image thumbimage = newimage.getthumbnailimage(int32.parse(width.text),int32.parse(height.text),null,0);
         image.dispose();
         thumbimage.save(server.mappath(filename1), imageformat.jpeg);
         image1.src=filename1;
         caption.text="";

      }

   </script>

   <body>
   <asp:label id="dis" runat=server/>
     <form enctype="multipart/form-data" runat=server>

          <h3>

          select file to upload: <input id="uploadfile" type=file runat=server>

          <asp:button text="upload me!" onclick="uploadbtn_click" runat=server/>

          <hr>

          <asp:panel id="imageeditor" visible=false runat=server>

             <img id="image1" src="" runat="server"/>

             <h3>
                image width: <asp:textbox id="width" runat=server/>

                 image height: <asp:textbox id="height" runat=server/> <br>

                 text caption: <asp:textbox id="caption" runat=server/>

                 caption size: <asp:dropdownlist id="fontsize" runat=server>
                                         <asp:listitem>14</asp:listitem>
                                         <asp:listitem>18</asp:listitem>
                                         <asp:listitem>26</asp:listitem>
                                         <asp:listitem>36</asp:listitem>
                                         <asp:listitem>48</asp:listitem>
                                         <asp:listitem>62</asp:listitem>
                                      </asp:dropdownlist>
                 caption font: <asp:dropdownlist id="fonttype" runat=server>
                                         <asp:listitem>黑体</asp:listitem>
                                         <asp:listitem>仿宋</asp:listitem>
                                         <asp:listitem>隶书</asp:listitem>
                                         <asp:listitem>楷书</asp:listitem>
                                         <asp:listitem>方正姚体</asp:listitem>
                                         <asp:listitem>华文彩云</asp:listitem>
                                      </asp:dropdownlist>

                 <asp:button text="update image" onclick="updatebtn_click" runat=server/>

             </h3>
          </asp:panel>

      </form>

   </body>
</htm