Gmail式的上传

原理参见
http://www.cnblogs.com/xbf321/archive/2007/11/09/954317.html

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>File Upload</title>
    <script type="text/javascript" src="js/jquery-1.2.6.js"></script>
    <script type="text/javascript">
    $(document).ready(function(){
        if(window.top == window)
        {
            var $div = $(document.createElement("div"));
            $div.html("<iframe src='"+document.URL+"' name='uploadiframe' id='uploadiframe'></iframe>");
            $div.css({display:"none"})
            $("body").append($div);
            $("form").attr("target","uploadiframe");
            $("form").submit();


            $(".myupload").empty();
            var $a = $(document.createElement("a"));
            $($a).html("upload");


            $($a).click(function(){
                $("#uploadiframe").contents().find(":file").click();
                $("#uploadiframe").contents().find(":submit").click();
                return false;
            });

            $(".myupload").append($a);
        }
    });
    </script>
    <script type="text/C#" runat="server">
        protected void File_Upload(object sender, EventArgs e)
        {
            if (FileUploadControl.HasFile == true)
            {
                FileUploadControl.SaveAs(@"D:\upload\" + FileUploadControl.FileName);
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div class="myupload">
    <asp:FileUpload ID="FileUploadControl" runat="server" />
    <asp:Button runat="server" OnClick="File_Upload" Text="Upload It" />
    </div>
    </form>
</body>
</html>