IEnumerable <object []>没有返回缺少的或空的XML元素</object []>

时间：2014-06-04 14:27:56

标签： c# xml linq-to-xml ienumerable

通过这个当前项目，我正在阅读1000-1700个XML文件并提取信息。我目前面临的问题是并非所有的XML都是干净的。有些缺少IEnumerable正在寻找的关键元素，或者数据只是空值。我的问题是我无法解释这些丢失或NULL值。我尝试过string.Empty和string.IsNullOrEmpty但智能感知并不喜欢它。我的思考过程如果元素缺失或返回null，则将这些值等于＆＃34; NA＆＃34;。我是不是以我的思维方式离开了基地？

private static IEnumerable<object[]> GetDocumentsData(string folderPath = @"filepath")
{

return Directory.GetFiles(folderPath, "*.xml")
.Select(XDocument.Load)
.SelectMany(file => file.Descendants().Where(e => e.Name.LocalName == "FilingLeadDocument")
.Concat(file.Descendants().Where(e => e.Name.LocalName == "FilingConnectedDocument")))
.Select(documentNode =>
{
try
{
var receivedDateNode = documentNode.Elements().FirstOrDefault(e => e.Name.LocalName == "DocumentReceivedDate");
var SequenceNode = documentNode.Elements().FirstOrDefault(e => e.Name.LocalName == "DocumentSequenceID");
var descriptionNode = documentNode.Elements().FirstOrDefault(e => e.Name.LocalName == "DocumentDescriptionText");
var metadataNode = documentNode.Elements().FirstOrDefault(e => e.Name.LocalName == "DocumentMetadata");
var registerActionNode = metadataNode.Elements().FirstOrDefault(e => e.Name.LocalName == "RegisterActionDescriptionText");

return new object[]
{
(string)documentNode.Parent.Parent.Elements().FirstOrDefault(e => e.Name.LocalName == "DocumentIdentification"),
SequenceNode != null ? SequenceNode.Value.Trim() : string.Empty,
(DateTime?)receivedDateNode.Elements().FirstOrDefault(e => e.Name.LocalName == "DateTime"),
descriptionNode != null ? descriptionNode.Value.Trim() : string.Empty,
registerActionNode != null ? registerActionNode.Value.Trim() : string.Empty
};
}
catch (Exception e)
{
//Log.error("");
return new object[] { };
}
}).ToArray();
}

XML示例（XML中缺少RegisterActionDescriptionText元素）

<?xml version="1.0"?>
<RecordFilingRequest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="urn:oasis:names:tc:legalxml-courtfiling:wsdl:WebServiceMessagingProfile-Definitions-4.0">
  <RecordFilingRequestMessage xmlns:fsrsp="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:FilingStatusResponseMessage-4.0" xmlns:ecf="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CommonTypes-4.0" xmlns:j="http://niem.gov/niem/domains/jxdm/4.0" xmlns:juvenile="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:JuvenileCase-4.0" xmlns:niem-xsd="http://niem.gov/niem/proxy/xsd/2.0" xmlns:domestic="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:DomesticCase-4.0" xmlns:s="http://niem.gov/niem/structures/2.0" xmlns:criminal="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CriminalCase-4.0" xmlns:amcadext="http://www.amcad.com/NiemEcf/extensions/1.0" xmlns:i="http://niem.gov/niem/appinfo/2.0" xmlns:appellate="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:AppellateCase-4.0" xmlns:nc="http://niem.gov/niem/niem-core/2.0" xmlns:citation="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CitationCase-4.0" xmlns:reviewcb="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:ReviewFilingCallbackMessage-4.0" xmlns:civil="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CivilCase-4.0">
    <nc:DocumentDescriptionText s:id="ReviewWorkQueueId">484</nc:DocumentDescriptionText>
    <nc:DocumentDescriptionText s:id="ReviewWorkQueue">Criminal Traffic Existing Cases</nc:DocumentDescriptionText>
    <nc:DocumentIdentification>
      <nc:IdentificationID>14115049</nc:IdentificationID>
    </nc:DocumentIdentification>
    <nc:DocumentPostDate>
      <nc:DateTime>2014-05-28T10:17:05.229345-04:00</nc:DateTime>
    </nc:DocumentPostDate>
    <nc:DocumentSubmitter>
      <ecf:EntityPerson s:id="REVIEWER">
        <nc:PersonName>
          <nc:PersonGivenName>re</nc:PersonGivenName>
          <nc:PersonSurName>re</nc:PersonSurName>
          <nc:PersonFullName>re</nc:PersonFullName>
        </nc:PersonName>
        <nc:PersonOtherIdentification>
          <nc:IdentificationID>51201</nc:IdentificationID>
          <nc:IdentificationCategoryText>FLEPORTAL</nc:IdentificationCategoryText>
        </nc:PersonOtherIdentification>
        <nc:PersonOtherIdentification>
          <nc:IdentificationID>re</nc:IdentificationID>
          <nc:IdentificationCategoryText>FLEPORTAL_LOGONNAME</nc:IdentificationCategoryText>
        </nc:PersonOtherIdentification>
        <ecf:PersonAugmentation>
          <nc:ContactInformation>
            <nc:ContactEmailID>re</nc:ContactEmailID>
            <nc:ContactMailingAddress>
              <nc:StructuredAddress>
                <nc:AddressDeliveryPointText>re</nc:AddressDeliveryPointText>
                <nc:LocationCityName>re</nc:LocationCityName>
                <nc:LocationStateUSPostalServiceCode>FL</nc:LocationStateUSPostalServiceCode>
                <nc:LocationStateName>FL</nc:LocationStateName>
              </nc:StructuredAddress>
              <nc:AddressFullText>re</nc:AddressFullText>
            </nc:ContactMailingAddress>
          </nc:ContactInformation>
        </ecf:PersonAugmentation>
      </ecf:EntityPerson>
    </nc:DocumentSubmitter>
    <ecf:SendingMDELocationID>
      <nc:IdentificationID>Filing Review MDE</nc:IdentificationID>
    </ecf:SendingMDELocationID>
    <ecf:SendingMDEProfileCode>urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:WebServicesMessaging-2.0</ecf:SendingMDEProfileCode>
    <CoreFilingMessage xmlns="urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CoreFilingMessage-4.0">
      <nc:DocumentEffectiveDate>
        <nc:DateTime>2014-05-28T08:00:00-04:00</nc:DateTime>
      </nc:DocumentEffectiveDate>
      <nc:DocumentIdentification>
        <nc:IdentificationID>14115049</nc:IdentificationID>
        <nc:IdentificationCategoryText>FLEPORTAL_FILING_ID</nc:IdentificationCategoryText>
      </nc:DocumentIdentification>
      <nc:DocumentInformationCutOffDate>
        <nc:DateTime>2014-05-27T17:50:51.297-04:00</nc:DateTime>
      </nc:DocumentInformationCutOffDate>
      <nc:DocumentPostDate>
        <nc:DateTime>2014-05-27T18:45:13.8464904-04:00</nc:DateTime>
      </nc:DocumentPostDate>
      <nc:DocumentReceivedDate>
        <nc:DateTime>2014-05-27T17:50:51.297-04:00</nc:DateTime>
      </nc:DocumentReceivedDate>
      <ecf:SendingMDELocationID>
        <nc:IdentificationID>URL/UNIQUE IDENTIFIER OF APPLICATION SENDING THIS REQUEST</nc:IdentificationID>
        <nc:IdentificationCategoryText>FLEPORTAL</nc:IdentificationCategoryText>
      </ecf:SendingMDELocationID>
      <ecf:SendingMDEProfileCode>urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:WebServicesMessaging-2.0</ecf:SendingMDEProfileCode>
      <criminal:Case>
        <nc:ActivityDescriptionText s:id="Criminal Traffic">re</nc:ActivityDescriptionText>
        <nc:CaseTitleText>re</nc:CaseTitleText>
        <nc:CaseCategoryText s:id="40781916535">831</nc:CaseCategoryText>
        <nc:CaseTrackingID>052014CT</nc:CaseTrackingID>
        <nc:CaseTrackingID s:id="ucn">052014CT</nc:CaseTrackingID>
        <j:CaseAugmentation>
          <j:CaseCourt>
            <nc:OrganizationIdentification>
              <nc:IdentificationID>05</nc:IdentificationID>
              <nc:IdentificationCategoryText>FLEPORTAL_ORGANIZATION</nc:IdentificationCategoryText>
            </nc:OrganizationIdentification>
            <nc:OrganizationIdentification>
              <nc:IdentificationID>28</nc:IdentificationID>
              <nc:IdentificationCategoryText>FLEPORTAL_ORGANIZATION_UNIT</nc:IdentificationCategoryText>
            </nc:OrganizationIdentification>
            <nc:OrganizationIdentification>
              <nc:IdentificationID>Trial</nc:IdentificationID>
              <nc:IdentificationCategoryText>COURT_TYPE</nc:IdentificationCategoryText>
            </nc:OrganizationIdentification>
            <nc:OrganizationIdentification>
              <nc:IdentificationID>Eighteenth Circuit</nc:IdentificationID>
              <nc:IdentificationCategoryText>JUDICIAL_CIRCUIT_ID</nc:IdentificationCategoryText>
            </nc:OrganizationIdentification>
            <nc:OrganizationName>re</nc:OrganizationName>
            <nc:OrganizationUnitName>Criminal Traffic</nc:OrganizationUnitName>
            <j:CourtName>Criminal Traffic</j:CourtName>
          </j:CaseCourt>
        </j:CaseAugmentation>
      </criminal:Case>
      <FilingLeadDocument s:id="DOC00001">
        <nc:DocumentApplicationName>application/pdf</nc:DocumentApplicationName>
        <nc:DocumentDescriptionText>CLASS EMPTY-CS-AAADH6K-CE- 1AAADH6K</nc:DocumentDescriptionText>
        <nc:DocumentDescriptionText s:id="DocumentGroup">MOTIONS</nc:DocumentDescriptionText>
        <nc:DocumentDescriptionText s:id="DocumentType">MOTION TO SUPRESS                                                                         </nc:DocumentDescriptionText>
        <nc:DocumentFileControlID s:id="FileInputId">101</nc:DocumentFileControlID>
        <nc:DocumentFileControlID s:id="Rule6PublicAnswer">-1</nc:DocumentFileControlID>
        <nc:DocumentFileControlID s:id="Rule6ConfidentialAnswer">-1</nc:DocumentFileControlID>
        <nc:DocumentFileControlID s:id="TypeOfConfidentialDocument">-1</nc:DocumentFileControlID>
        <nc:DocumentPostDate>
          <nc:DateTime>2014-05-27T18:45:13.8464904-04:00</nc:DateTime>
        </nc:DocumentPostDate>
        <nc:DocumentReceivedDate>
          <nc:DateTime>2014-05-27T17:50:51.297-04:00</nc:DateTime>
        </nc:DocumentReceivedDate>
        <nc:DocumentSequenceID>1</nc:DocumentSequenceID>
        <ecf:DocumentRendition>
          <ecf:DocumentRenditionMetadata>
            <nc:DocumentApplicationName>application/pdf</nc:DocumentApplicationName>
            <nc:DocumentFileControlID>Class EMPTY-CS-AAADH6K-CE- 1AAADH6K.PDF</nc:DocumentFileControlID>
            <ecf:DocumentAttachment s:id="ATT00001">
              <nc:BinaryBase64Object>removed by RB </nc:BinaryBase64Object>
              <nc:BinarySizeValue>101864</nc:BinarySizeValue>
              <ecf:AttachmentSequenceID>1</ecf:AttachmentSequenceID>
            </ecf:DocumentAttachment>
          </ecf:DocumentRenditionMetadata>
        </ecf:DocumentRendition>
      </FilingLeadDocument>
    </CoreFilingMessage>
 </RecordFilingRequestMessage>
</RecordFilingRequest>

2 个答案:

答案 0 :(得分：1)

假设你要求这个我错了：

return new object[]
{
(string)documentNode.Parent.Parent.Elements().FirstOrDefault(e => e.Name.LocalName == "DocumentIdentification"),
SequenceNode != null ? SequenceNode.Value.Trim() : "NA",
(DateTime?)receivedDateNode.Elements().FirstOrDefault(e => e.Name.LocalName == "DateTime"),
descriptionNode != null ? descriptionNode.Value.Trim() : "NA",
registerActionNode != null ? registerActionNode.Value.Trim() : "NA"
};

答案 1 :(得分：1)

为了解析这个xml，你必须在按名称搜索元素时处理命名空间。所以，你应该做的第一件事就是获得你需要的命名空间：

var xdoc = XDocument.Load(fileName);
var ns = xdoc.Root.GetDefaultNamespace();
XNamespace ecf = "urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CommonTypes-4.0";
XNamespace nc = "http://niem.gov/niem/niem-core/2.0";
XNamespace s = "http://niem.gov/niem/structures/2.0";
XNamespace cfm = "urn:oasis:names:tc:legalxml-courtfiling:schema:xsd:CoreFilingMessage-4.0";

接下来你需要的是将元素的全名传递给Linq方法而不是按本地名称搜索（记住，Linq方法接受元素的XName而不是简单的字符串）。因此，如果您需要FilingLeadDocument及其内容

var fld = xdoc.Root.Element(ns + "RecordFilingRequestMessage")
              .Element(cfm + "CoreFilingMessage")
              .Element(cfm + "FilingLeadDocument");

接下来会读取可能缺失的元素的值。如果您使用Value属性，那么您将获得NullReferenceException。所以，你应该使用元素的转换。例如。如果找不到元素，则转换为字符串将返回元素值或null。

var fillingLeadDoc = new FillingLeadDoc {
    ReceivedDate = (DateTime?)fld.Elements(nc + "DocumentReceivedDate")
                                 .Elements(nc + "DateTime").FirstOrDefault(),
    SequenceId = (int?)fld.Element(nc + "DocumentSequenceID"),
    DescriptionText = (string)fld.Element(nc + "DocumentDescriptionText")
};

FillingLeadDoc是哪个

public class FillingLeadDoc
{
    public int? SequenceId { get; set; }
    public DateTime? ReceivedDate { get; set; }
    public string DescriptionText { get; set; }
}

对于您的样本，将创建以下实例：

{
  SequenceId: 1,
  ReceivedDate: "2014-05-28T00:50:51.297+03:00",
  DescriptionText: "CLASS EMPTY-CS-AAADH6K-CE- 1AAADH6K"
}

将此代码移至某个GetFillingLeadDoc方法：

private static FillingLeadDoc GetFillingLeadDoc(string fileName)
{
    // code above
    return fillingLeadDoc;
}

并为每个文件调用此方法：

private static IEnumerable<FillingLeadDoc> GetDocumentsData(
   string folderPath = @"filepath")
{
   return Directory.GetFiles(folderPath, "*.xml")
                   .Select(GetFillingLeadDoc);
}

然后将网格绑定到这些文档。

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