C#：如何在xml文件的多条记录中的特定位置添加xml元素

我有一个包含多个表的大型xml文件。我想在特定位置添加一个元素。我试过了，但在我的例子中，元素终于被添加了，这对于我的场景来说是不可取的

我的表是xml格式的<代码>TickerBroker、Broker、BrokerTab和TickerBrokerDateFormatMap

我有多个Broker元素，当我添加一个新的Broker时，它会被添加到xml文件的末尾TickerBrokerDateFormatMap元素之后。我想在xml文件中最后一个代理元素的末尾添加代理元素

如果xml文件中不存在代理元素，那么我的代理元素应该添加到最后一个TickerBroker元素的末尾

这里我给出了示例xml数据，有点长

<?xml version="1.0" standalone="yes"?>
<TickerBrokerDateMap>
  <TickerBroker>
    <Ticker_Id>ADBE</Ticker_Id>
    <Ticker_Id_auto>ADBE</Ticker_Id_auto>
  </TickerBroker>

  <Broker ID="MV-P1" Ticker_Id="ADBE" BrokerCategory="Cascade" Client="">
    <Broker_Id>25</Broker_Id>
    <ALLTabsUnderBroker>
      <Broker>MV-P1</Broker>
      <TAB>QIS</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>25</Broker_Id>
      <ReviewedEarnings>3Q 2019</ReviewedEarnings>
      <Pre-Post>Post</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>MV-P1</Broker>
      <TAB>BS</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>25</Broker_Id>
      <ReviewedEarnings>3Q 2019</ReviewedEarnings>
      <Pre-Post>Post</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>MV-P1</Broker>
      <TAB>METRICS</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>25</Broker_Id>
      <ReviewedEarnings>3Q 2019</ReviewedEarnings>
      <Pre-Post>Post</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>MV-P1</Broker>
      <TAB>ESTIMATE</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>25</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>MV-P1</Broker>
      <TAB>EPS</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>25</Broker_Id>
      <ReviewedEarnings>3Q 2019</ReviewedEarnings>
      <Pre-Post>Post</Pre-Post>
    </ALLTabsUnderBroker>
  </Broker>
  <Broker ID="UN" Ticker_Id="ADBE" BrokerCategory="Contributing" Client="">
    <Broker_Id>27</Broker_Id>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>ModelCover</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Assumptions</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Revenue Build</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings>4Q2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Segment Breakout</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Geographic Breakout</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings>4Q2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Calcs</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Debt</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>GAAP Income Statement</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings>4Q2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Non-GAAP Income Statement</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings>4Q2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Balance Sheet</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings>4Q2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Cash Flow</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings>4Q2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>UN</Broker>
      <TAB>Disclosures</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>27</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
  </Broker>
  <Broker ID="BW" Ticker_Id="ADBE" BrokerCategory="NonContributing" Client="">
    <Broker_Id>28</Broker_Id>
    <ALLTabsUnderBroker>
      <Broker>BW</Broker>
      <TAB>Adobe Model_Stifel</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>28</Broker_Id>
      <ReviewedEarnings>4Q 2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>BW</Broker>
      <TAB>Disclaimer (Read first)</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>28</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>BW</Broker>
      <TAB>Sources</TAB>
      <Commnet1 />
      <Commnet2 />
      <Broker_Id>28</Broker_Id>
      <ReviewedEarnings />
    </ALLTabsUnderBroker>
  </Broker>
  <Broker ID="PJ-C1" Ticker_Id="ADBE" BrokerCategory="Contributing" Client="">
    <Broker_Id>29</Broker_Id>
    <ALLTabsUnderBroker>
      <Broker>PJ-C1</Broker>
      <TAB>IS</TAB>
      <Commnet1>Use Custom</Commnet1>
      <Commnet2>Use Custom</Commnet2>
      <Broker_Id>29</Broker_Id>
      <ReviewedEarnings>4Q 2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>PJ-C1</Broker>
      <TAB>BS</TAB>
      <Commnet1>Use Custom</Commnet1>
      <Commnet2>Use Custom</Commnet2>
      <Broker_Id>29</Broker_Id>
      <ReviewedEarnings>4Q 2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>PJ-C1</Broker>
      <TAB>CF</TAB>
      <Commnet1>Use Custom</Commnet1>
      <Commnet2>Use Custom</Commnet2>
      <Broker_Id>29</Broker_Id>
      <ReviewedEarnings>4Q 2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
    <ALLTabsUnderBroker>
      <Broker>PJ-C1</Broker>
      <TAB>Segment Breakout</TAB>
      <Commnet1>Use Custom</Commnet1>
      <Commnet2>Use Custom</Commnet2>
      <Broker_Id>29</Broker_Id>
      <ReviewedEarnings>4Q 2019</ReviewedEarnings>
      <Pre-Post>Pre</Pre-Post>
    </ALLTabsUnderBroker>
  </Broker>
  <BrokerTab name="IS" Broker_Id="0" Ticker_Id="ADBE" Revise_Date="11-19-2019">
    <BrokerTab_Id>0</BrokerTab_Id>
    <Tab_index>0</Tab_index>
    <save_flag>true</save_flag>
    <isUSed>true</isUSed>
  </BrokerTab>
  <BrokerTab name="Drivers" Broker_Id="0" Ticker_Id="ADBE" Revise_Date="11-19-2019">
    <BrokerTab_Id>1</BrokerTab_Id>
    <Tab_index>1</Tab_index>
    <save_flag>true</save_flag>
    <isUSed>true</isUSed>
  </BrokerTab>
  <BrokerTab name="BS" Broker_Id="0" Ticker_Id="ADBE" Revise_Date="11-19-2019">
    <BrokerTab_Id>2</BrokerTab_Id>
    <Tab_index>2</Tab_index>
    <save_flag>true</save_flag>
    <isUSed>true</isUSed>
  </BrokerTab>
  <BrokerTab name="CF" Broker_Id="0" Ticker_Id="ADBE" Revise_Date="11-19-2019">
    <BrokerTab_Id>3</BrokerTab_Id>
    <Tab_index>3</Tab_index>
    <save_flag>true</save_flag>
    <isUSed>true</isUSed>
  </BrokerTab>
  <TickerBrokerDateFormatMap BrokerTab_Id="154" Broker_Id="29" Ticker_Id="ADBE">
    <StandardDate>2021 FYE</StandardDate>
    <ColumnCoordinate>AQ</ColumnCoordinate>
    <TickerBrokerDateFormatMaps_Id>168</TickerBrokerDateFormatMaps_Id>
    <BrokerDate StandardDate="2021 FYE" Broker_Id="29" BrokerTab_Id="154">
      <year>2021 FYE</year>
      <Quater>2021 FYE</Quater>
    </BrokerDate>
  </TickerBrokerDateFormatMap>
</TickerBrokerDateMap>

请看，我使用的是XDocument类，因此请使用XDocument发布任何示例代码。谢谢

你应该调查一下

这些方法完全符合您的要求：

在此节点之后立即添加指定的内容

例如：

xmlDocZip.Root.Descendants("Broker").LastOrDefault()?.AddAfterSelf(brokerelement);

验证LastOrDefault在调用AddAfterSelf之前是否不会返回null非常重要，否则它将抛出NullReferenceException

// If xml has any Broker tag
if(xmlDocZip.Root.Descendants("Broker").Any())
{
    xmlDocZip.Root.Descendants("Broker").LastOrDefault().AddAfterSelf(brokerelement);
}
else if (xmlDocZip.Root.Descendants("TickerBroker").Any())
{
    xmlDocZip.Root.Descendants("TickerBroker").LastOrDefault().AddAfterSelf(brokerelement);
}

---

你把它弄得太复杂了：XElement dataMap=xmlDocZip.Root；添加（代理关系）；

// If xml has any Broker tag
if(xmlDocZip.Root.Descendants("Broker").Any())
{
    xmlDocZip.Root.Descendants("Broker").LastOrDefault().AddAfterSelf(brokerelement);
}
else if (xmlDocZip.Root.Descendants("TickerBroker").Any())
{
    xmlDocZip.Root.Descendants("TickerBroker").LastOrDefault().AddAfterSelf(brokerelement);
}