值不能为空。参数名称:元素
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我正在尝试从XML信用报告中提取数据。我需要清除某些条目的功能。
这是我用来尝试获取值列表的代码。
var trades = from x in xmlStr.Descendants("USTrade")
where (int) x.Element("BalanceAmount") > 0
select (int)x.Element("ScheduledPaymentAmount");
样本数据如下:
<USTrade>
<ExpandedDataDimensionsReturned code="T" description="Enhanced Trade with All 6.0 Trade Fields" />
<CreditorId>
<CustomerNumber>801ON00630</CustomerNumber>
<Name>BK OF AMER</Name>
<Industry code="ON" description="National Credit Card Cos." />
</CreditorId>
<DateReported format="MM/CCYY">07/2019</DateReported>
<DateOpened format="MM/CCYY">12/2007</DateOpened>
<AccountNumber>4509128960678</AccountNumber>
<HighCreditAmount>0020500</HighCreditAmount>
<BalanceAmount>0000076</BalanceAmount>
<PortfolioType code="R" description="Revolving or Option (open-end account)" />
<Status code="1" description="Pays Acct As Agreed" />
<MonthsReviewed>21</MonthsReviewed>
<AccountDesignator code="I" description="Individual" />
<DateOfLastActivity format="MM/CCYY">07/2019</DateOfLastActivity>
<ScheduledPaymentAmount>0000015</ScheduledPaymentAmount>
<UpdateIndicator code="*" description="Tape" />
<Narratives>
<Narrative code="FE" description="Credit Card" />
<Narrative code="AZ" description="Amount In H/C Column Is Credit Limit" />
</Narratives>
<ExpandedCreditorId>
<Name>BANK OF AMERICA</Name>
</ExpandedCreditorId>
<ExpandedDateReported format="MM/CCYY">07/2019</ExpandedDateReported>
<ExpandedDateOpened format="MM/CCYY">12/2007</ExpandedDateOpened>
<ExpandedCreditLimit>000020500</ExpandedCreditLimit>
<ExpandedBalanceAmount>000000076</ExpandedBalanceAmount>
<ExpandedPortfolioType code="R" description="Revolving or Option (open-end account)" />
<ExpandedStatus code="1" description="Pays Acct As Agreed" />
<ExpandedNarratives>
<Narrative code="FE" description="Credit Card" />
</ExpandedNarratives>
<ExpandedScheduledPaymentAmount>000000015</ExpandedScheduledPaymentAmount>
</USTrade>
<USTrade>
<ExpandedDataDimensionsReturned code="T" description="Enhanced Trade with All 6.0 Trade Fields" />
<CreditorId>
<CustomerNumber>801ON00630</CustomerNumber>
<Name>BK OF AMER</Name>
<Industry code="ON" description="National Credit Card Cos." />
</CreditorId>
<DateReported format="MM/CCYY">10/2018</DateReported>
<DateOpened format="MM/CCYY">12/2007</DateOpened>
<AccountNumber>4509128960565</AccountNumber>
<Status code="B" description="Lost or Stolen Card" />
<DateOfLastActivity format="MM/CCYY">10/2018</DateOfLastActivity>
<UpdateIndicator code="*" description="Tape" />
<Narratives>
<Narrative code="FE" description="Credit Card" />
</Narratives>
<ExpandedCreditorId>
<Name>BANK OF AMERICA</Name>
</ExpandedCreditorId>
<ExpandedDateReported format="MM/CCYY">10/2018</ExpandedDateReported>
<ExpandedDateOpened format="MM/CCYY">12/2007</ExpandedDateOpened>
<ExpandedStatus code="B" description="Lost or Stolen Card" />
<ExpandedNarratives>
<Narrative code="FE" description="Credit Card" />
</ExpandedNarratives>
</USTrade>
我不断收到“值不能为空。参数名称:元素”错误。
[当我通过数据进行挖掘时,我看到一些USTrades没有我要搜索的元素-会导致此问题吗?如果是这样,我该如何处理? (即A UsTrade没有ScheduledPaymentAmount元素)
谢谢
答案
您可以修改查询以仅搜索具有ScheduledPaymentAmount
元素的对象。例如
var trades = from x in xmlStr.Descendants("USTrade")
where (int) x.Element("BalanceAmount") > 0
and x.Element("ScheduledPaymentAmount") != null
select (int)x.Element("ScheduledPaymentAmount");
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