<%@ page language="c#" responseencoding="gb2312" %> <%@ import namespace="system" %> <%@ import namespace="system.io" %> <%@ import namespace="system.drawing" %> <%@ import namespace="system.drawing.imaging" %> <script runat="server"> 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="没有选择文件"; } else { string path = server.mappath("./uploads/"+uploadfile.postedfile.filename.substring(uploadfile.postedfile.filename.lastindexof('\\')+1)); if(file.exists(path)) { lblerrinfo.text="已经有同名文件"; } else { uploadfile.postedfile.saveas(path); getthumbnailimage(width,height,straddinfo,left,right); } } } </script> <html> <head> </head> <body> <form method="post" enctype="multipart/form-data" runat="server"> <p> <input id="uploadfile" type="file" runat="server" /> <asp:label id="lblerrinfo" runat="server" forecolor="red"></asp:label> </p> <p> width:<asp:textbox id="txtwidth" runat="server" width="40px">100</asp:textbox> height:<asp:textbox id="txtheight" runat="server" width="40px">150</asp:textbox> </p> <p> 添加信息：<asp:textbox id="txtaddinfo" runat="server"> aspxboy.com</asp:textbox> </p> <p> 信息位置：left:<asp:textbox id="txtleft" runat="server" width="40px">10</asp:textbox> right:<asp:textbox id="txtright" runat="server" width="40px">135</asp:textbox> </p> <p> <input id="button" type="button" value="上传生成所略图" onserverclick="button_click" runat="server" /> </p> <p><asp:image id="imgpreview" runat="server"></asp:image> </p> <!-- insert content here --> </form> </body> </html>
以上就是asp.net上传图片并生成可带版权信息的缩略图的详细内容。