在InfoPath里弹出窗口，可以用Notify(message)就可以实现，不过要修改layouts文件夹里面一个FormServer文件
修改后的代码为
<%@ Page
inherits="Microsoft.Office.InfoPath.Server.Controls.FormServerPage,Microsoft.Office.InfoPath.Server, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"
EnableSessionState="true"
AutoEventWireup="false"
EnableViewState="false"
LinePragmas="false"
Language="C#"
ValidateRequest="true"
%>
<%@ Register Tagprefix="InfoPath" Namespace="Microsoft.Office.InfoPath.Server.Controls" Assembly="Microsoft.Office.InfoPath.Server, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<script runat="server">
protected void XmlFormView1_NotifyHost(object sender, NotifyHostEventArgs e)
{
string jsCode = String.Format("alert(\"{0}\");", e.Notification);
ClientScript.RegisterStartupScript(typeof(string), "AlertScript",jsCode, true);
}
</script>
<html>
<head runat="server">
</head>
<body style="margin: 0px;overflow:auto;">
<form runat="server" id="HostingForm" method="post" enctype="multipart/form-data" style="100%;">
<InfoPath:XmlFormView id="FormControl" OnNotifyHost="XmlFormView1_NotifyHost" Style="100%;" runat="server"/>
</form>
</body>
</html>