Infopath FileQueryConnection.Execute(XpathNavigator) throws System.Net.WebException: Attempted to read or write protected memory答案

【问题标题】：Infopath FileQueryConnection.Execute(XpathNavigator) throws System.Net.WebException: Attempted to read or write protected memoryInfopath FileQueryConnection.Execute(XpathNavigator) throws System.Net.WebException: Attempted to read or write protected memory
【发布时间】：2011-04-19 06:11:25
【问题描述】：

我在 2007 年启用浏览器的 infopath 表单的字段更改事件中有此代码 -

 try
        {

        XmlDocument outputFile = new XmlDocument();
FileQueryConnection con = (FileQueryConnection)DataConnections["connection1"];
con.FileLocation = @"http://server_name/_vti_bin/owssvr.dll"
         + "?Cmd=Display&List={List_ID}"
         + "&XMLDATA=TRUE&View={View_ID}&Query=*"
            + "&FilterField1=Country_x0020_Name&FilterValue1="
            + country.Replace("&","%26");
            outputFile.LoadXml("<?xml version=\"1.0\" encoding=\"utf-8\" ?><outputRoot></outputRoot>");

            XmlNamespaceManager outputFileNamespaceManager = new XmlNamespaceManager(outputFile.NameTable);

            // XmlDocument output file created above.
            XPathNavigator outputFileNavigator = outputFile.CreateNavigator();
            XPathNavigator outputRootNavigator = 
            outputFileNavigator.SelectSingleNode("/outputRoot",outputFileNamespaceManager);
            con.Execute(outputRootNavigator);
            File.AppendAllText(@"E:\log.txt", outputRootNavigator.ToString());
        }
        catch (Exception exp)
        {
            File.AppendAllText(@"E:\exp.txt", exp.ToString());
        }

我得到了这个异常 -

System.Net.WebException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.at Microsoft.Office.InfoPath.Internal.MomExceptionHelper.ExecuteDataConnectionAction(OMCall d) at Microsoft.Office.InfoPath.Internal.FileQueryConnectionHost.Execute(XPathNavigator output) at cascadeTemplate.FormCode.field1_Changed(Object sender, XmlEventArgs e)

为什么会抛出这样的异常？我的代码中是否缺少某些内容？

感谢您的帮助！

【问题讨论】：

标签： c# asp.net xml sharepoint infopath

【解决方案1】：

con.Execute(outputRootNavigator); 在写入日志文件之前，您应该在此处关闭连接“con”。 File.AppendAllText(@"E:\log.txt", outputRootNavigator.ToString());

【讨论】：

【解决方案2】：

它很可能是由 FileQueryConnection 引起的。由于从未使用过 con 变量，因此删除以下行：

     FileQueryConnection con = (FileQueryConnection)DataConnections["connection1"];
     con.FileLocation = ...

【讨论】：

对不起！我不明白！如果我删除这些行，我将无法使用将内容写入 xml 文档的 con.Execute() 方法。