关于解决WinRiver项目动态XmlElement的序列化与反序列化的问题

一、WinRiver项目流量汇总XML内容

WinRiver项目流量汇总的XML内容，由断面测回次数决定，其 Index_0-Index_N为动态的，N为可变数。
以如下底跟踪流量汇总数据XML内容为例（只展示了 Index_N 内的精简内容）。

1.1、索引可变，索引下 XmlElement 元素内容固定

断面测回次数为 6，底跟踪流量汇总索引为 Index_0-5。

<Discharge_Summary><None>结构和 BottomTrack 一致，限于篇幅省略，以下类似</None><BottomTrack><Index_0><UseInSummary>0</UseInSummary><BeginLeft>0</BeginLeft><IsSubSectioned>0</IsSubSectioned><FileName>NX20250605000</FileName><TransectNmb>000</TransectNmb><TotalNmbEnsembles>13</TotalNmbEnsembles><TotalBadEnsembles>0</TotalBadEnsembles><TotalLostEnsembles>0</TotalLostEnsembles></Index_0><Index_1><UseInSummary>0</UseInSummary><BeginLeft>1</BeginLeft><IsSubSectioned>0</IsSubSectioned><FileName>NX20250605001</FileName><TransectNmb>001</TransectNmb><TotalNmbEnsembles>14</TotalNmbEnsembles><TotalBadEnsembles>0</TotalBadEnsembles><TotalLostEnsembles>0</TotalLostEnsembles></Index_1><Index_2><UseInSummary>1</UseInSummary><BeginLeft>0</BeginLeft><IsSubSectioned>0</IsSubSectioned><FileName>NX20250605002</FileName><TransectNmb>002</TransectNmb><TotalNmbEnsembles>18</TotalNmbEnsembles><TotalBadEnsembles>0</TotalBadEnsembles><TotalLostEnsembles>0</TotalLostEnsembles></Index_2><Index_3><UseInSummary>1</UseInSummary><BeginLeft>1</BeginLeft><IsSubSectioned>0</IsSubSectioned><FileName>NX20250605003</FileName><TransectNmb>003</TransectNmb><TotalNmbEnsembles>12</TotalNmbEnsembles><TotalBadEnsembles>0</TotalBadEnsembles><TotalLostEnsembles>0</TotalLostEnsembles></Index_3><Index_4><UseInSummary>1</UseInSummary><BeginLeft>0</BeginLeft><IsSubSectioned>0</IsSubSectioned><FileName>NX20250605004</FileName><TransectNmb>004</TransectNmb><TotalNmbEnsembles>16</TotalNmbEnsembles><TotalBadEnsembles>0</TotalBadEnsembles><TotalLostEnsembles>0</TotalLostEnsembles></Index_4><Index_5><UseInSummary>1</UseInSummary><BeginLeft>1</BeginLeft><IsSubSectioned>0</IsSubSectioned><FileName>NX20250605005</FileName><TransectNmb>005</TransectNmb><TotalNmbEnsembles>15</TotalNmbEnsembles><TotalBadEnsembles>0</TotalBadEnsembles><TotalLost