正在阅读：asp.net上传图片并同时生成缩略图asp.net上传图片并同时生成缩略图

　　<script language="VB" runat="server">
　　Sub UploadFile(sender As Object, e As EventArgs)

　　If FileUp.PostedFile.ContentLength = 0 Then
　　FileInfo.Visible = False
　　Exit Sub
　　Else
　　FileInfo.Visible = True
　　FDisplay1.Visible = True
　　End If

　　FSize.Text ="上传文件大小"+ CStr(FileUp.PostedFile.ContentLength/1024)+"KB"
　　FName.Text = "已上传文件名:"+FileUp.PostedFile.FileName+"<br>"+FName.Text

　　'写入数据库
　　on error resume next
　　dim myconn as sqlconnection
　　dim mycomm as sqlcommand
　　dim sql as string
　　dim id as integer
　　Dim image,anewimage As System.Drawing.Image
　　dim width,height,newwidth,newheight as integer
　　Dim callb As System.Drawing.Image.GetThumbnailImageAbort
　　myConn=New sqlconnection(ConfigurationSettings.AppSettings("数据库"))
　　myconn.open()
　　sql="insert into picture (姓名,班级,介绍,属性) values ('"&request.cookies("dgxyl").values("dgxylname")&"','"&request.cookies("dgxyl").values("dgxylbj")&"','"&trim(request("TextBox1"))&"','"&request("r1")&"')"
　　Mycomm=New sqlcommand(sql,myconn)
　　mycomm.executenonquery()
　　myconn.close()

　　Dim myCommand As New SqlCommand("select top 1 id from picture order by id desc", myConn)
　　myCommand.Connection.Open()
　　Dim myReader As SqlDataReader=mycommand.executereader()
　　if myReader.Read() then
　　id=myReader("id")
　　end if
　　myconn.close()
　　'保存图片
　　FileUp.PostedFile.SaveAs( Server.MapPath("\classpic\")&cstr(id)&".jpg" )
　　'生成缩略图
　　image=System.Drawing.Image.FromFile(Server.MapPath("/classpic/"+cstr(id)+".jpg"))
　　width=image.Width
　　height=image.height
　　if width>height then
　　newwidth=250
　　newheight=image.height/image.Width*newwidth
　　else
　　newheight=250
　　newwidth=image.Width/image.height*newheight
　　end if
　　response.write("id="+cstr(id)+"width="+cstr(Width)+";height="+cstr(height)+" ")
　　response.write("newwidth="+cstr(newwidth)+";newheight="+cstr(newheight)+"<br>")

　　aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr())
　　aNewImage.Save(Server.MapPath("/smallpic/"+cstr(id)+".jpg"))
　　image.Dispose()

　　Dim FileSplit() As String = Split( FileUp.PostedFile.FileName, "\" )
　　Dim FileName As String = FileSplit(FileSplit.Length-1)
　　Dim Exts() As String = Split( FileName, "." )
　　Dim Ext As String = LCase(Exts(Exts.Length-1))

　　FDisplay.Text = "<A Target='_blank' HREF='/classpic/"&cstr(id)&".jpg"& "'>查看上传文件</A>"
　　FDisplay1.text="<a href='/picture/default.asp?bj="&cstr(request.cookies("dgxyl").values("dgxylbj"))&"'>返回</a>"
　　End Sub
　　</script>
　　<SCRIPT language=JavaScript>
　　<!--
　　var requestsubmitted=false;
　　function guestbook_Validator(theForm)
　　{
　　//检查是否从新提交
　　if (requestsubmitted==true){
　　alert("你已经提交了留言，请等待服务器应答！");
　　return(false);
　　}
　　requestsubmitted=true;

　　return (true);
　　}
　　//-->
　　</SCRIPT>