c# – LINQ to XML：查询主体必须以select子句或group子句结束

发布时间：2020-12-16 00:21:58 所属栏目：百科来源：网络整理

导读：有人可以指导我修复此查询的错误： var objApps = from item in xDoc.Descendants("VHost") where(from x in item.Descendants("Application")) select new clsApplication { ConnectionsTotal = item.Element("ConnectionsTotal").Value }; 它显示编译器错

有人可以指导我修复此查询的错误：

var objApps = from item in xDoc.Descendants("VHost") 
                          where(from x in item.Descendants("Application"))
                          select new clsApplication
                       {
                           ConnectionsTotal = item.Element("ConnectionsTotal").Value
                       };

它显示编译器错误“查询主体必须以select子句或组子句结束”.我哪里错了？

将不胜感激任何帮助..

谢谢.

编辑：这是我的XML(这里没有关闭标签)…我需要Application中的connectioncount值..

- <Server>
  <ConnectionsCurrent>67</ConnectionsCurrent> 
  <ConnectionsTotal>1424182</ConnectionsTotal> 
  <ConnectionsTotalAccepted>1385091</ConnectionsTotalAccepted> 
  <ConnectionsTotalRejected>39091</ConnectionsTotalRejected> 
  <MessagesInBytesRate>410455.0</MessagesInBytesRate> 
  <MessagesOutBytesRate>540146.0</MessagesOutBytesRate> 
- <VHost>
  <Name>_defaultVHost_</Name> 
  <TimeRunning>5129615.178</TimeRunning> 
  <ConnectionsLimit>0</ConnectionsLimit> 
  <ConnectionsCurrent>67</ConnectionsCurrent> 
  <ConnectionsTotal>1424182</ConnectionsTotal> 
  <ConnectionsTotalAccepted>1385091</ConnectionsTotalAccepted> 
  <ConnectionsTotalRejected>39091</ConnectionsTotalRejected> 
  <MessagesInBytesRate>410455.0</MessagesInBytesRate> 
  <MessagesOutBytesRate>540146.0</MessagesOutBytesRate> 
- <Application>
  <Name>TestApp</Name> 
  <Status>loaded</Status> 
  <TimeRunning>411642.953</TimeRunning> 
  <ConnectionsCurrent>11</ConnectionsCurrent> 
  <ConnectionsTotal>43777</ConnectionsTotal> 
  <ConnectionsTotalAccepted>43135</ConnectionsTotalAccepted> 
  <ConnectionsTotalRejected>642</ConnectionsTotalRejected> 
  <MessagesInBytesRate>27876.0</MessagesInBytesRate> 
  <MessagesOutBytesRate>175053.0</MessagesOutBytesRate>

解决方法

编译器抱怨这一部分

from x in item.Descendants("Application")

在你的Where子句中.你应该改变它

>最后有一个select子句,并且
>它构成了一个表达式,对于您希望保留的项目对象,该表达式的计算结果为true.

这是我对你想要做的最好的猜测(编辑：尝试第二)

var objApps = from item in xDoc.Descendants("VHost").Descendants("Application") 
              select new clsApplication {
                  ConnectionsTotal = item.Element("ConnectionsTotal").Value
              };

（编辑：李大同）

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