序列化对象到XML和XML

Question

删除不需要的文本我有我想要序列化到XML的对象，我使用下面的代码进行了这一点：

public static string Serialize(object obj) 
    { 
     using (var memoryStream = new MemoryStream()) 
     using (var reader = new StreamReader(memoryStream)) 
     { 
      var serializer = new DataContractSerializer(obj.GetType()); 
      serializer.WriteObject(memoryStream, obj); 
      memoryStream.Position = 0; 
      return reader.ReadToEnd(); 
     } 
    } 

，当我这样做，我得到以下XML：

<TestRequestPOCO xmlns=\"http://schemas.datacontract.org/2004/07/GPTR.Model.POCOs\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"> 
    <AdditionalInformation>Additional Information</AdditionalInformation> 
    <AddressLine1>6 MOUNT PLEASANT ROAD</AddressLine1> 
    <AddressLine2>LEEDS</AddressLine2> 
    <AddressLine3 i:nil=\"true\"/> 
    <AddressLine4 i:nil=\"true\"/> 
    <AntibioticTherapy i:nil=\"true\"/> 
    <ClinicalInformation>Clinical Information</ClinicalInformation> 
    <ClinicalInformationXml i:nil=\"true\"/> 
    <Clinician>Dr NM BRYAN</Clinician> 
    <ClinicianCode>4203845</ClinicianCode> 
    <ClinicianShortCode :nil=\"true\"/> 
    <Destination>1</Destination> 
    <Dob>1992-02-29T00:00:00</Dob> 
    <ExpectedDate>2011-10-06T10:22:57.096+01:00</ExpectedDate> 
    <FirstName>ALISON</FirstName> 
    <GenerateOrder>true</GenerateOrder> 
    <HospitalNumber i:nil=\"true\"/> 
    <IsFasting>false</IsFasting> 
    <IsPrivatePatient>false</IsPrivatePatient> 
    <IsSensitive>false</IsSensitive> 
    <IsUrgent>false</IsUrgent> 
    <Items> 
     <RequestDataItem> 
      <AdditionalInfo i:nil=\"true\"/> 
      <Container i:nil=\"true\"/> 
      <Description>Ferritin [Serum]</Description> 
      <LIMSDeptName>CHM</LIMSDeptName> 
      <ProfileNumber>1293</ProfileNumber> 
      <QualifierCode i:nil=\"true\"/> 
      <SiteCode i:nil=\"true\"/> 
      <SpecimenType>Serum</SpecimenType> 
      <UniqueTest>False</UniqueTest> 
     </RequestDataItem> 
    </Items> 
    <Location>0</Location> 
    <LocationName>The INPS Practice</LocationName> 
    <LocationShortCode>W97046</LocationShortCode> 
    <LocationTelephone>01792602898</LocationTelephone> 
    <MiddleName i:nil=\"true\"/> 
    <NhsNumber>5240022631</NhsNumber> 
    <OrgCode>RRS</OrgCode> 
    <Placer>Dr Sarah Saturn</Placer> 
    <PostCode>CF31 5EP</PostCode> 
    <Sex>Male</Sex> 
    <Source>GPTR</Source> 
    <SurName>WILLIAMS</SurName> 
    <TelephoneNumber>01792776776</TelephoneNumber> 
</TestRequestPOCO>" 

正如你所看到的，它不处理空标签很好，我也想这样我结束了这样的事情剔除根标签的文本：

<TestRequestPOCO> 
    <AdditionalInformation>Additional Information</AdditionalInformation> 
    <AddressLine1>6 MOUNT PLEASANT ROAD</AddressLine1> 
    <AddressLine2>LEEDS</AddressLine2> 
    <AddressLine3/> 
    <AddressLine4/> 
    <AntibioticTherapy> 
    <ClinicalInformation>Clinical Information</ClinicalInformation> 
    <ClinicalInformationXml/> 
    <Clinician>Dr NM BRYAN</Clinician> 
    <ClinicianCode>4203845</ClinicianCode> 
    <ClinicianShortCode/> 
    <Destination>1</Destination> 
    <Dob>1992-02-29T00:00:00</Dob> 
    <ExpectedDate>2011-10-06T10:22:57.096+01:00</ExpectedDate> 
    <FirstName>ALISON</FirstName> 
    <GenerateOrder>true</GenerateOrder> 
    <HospitalNumber/> 
    <IsFasting>false</IsFasting> 
    <IsPrivatePatient>false</IsPrivatePatient> 
    <IsSensitive>false</IsSensitive> 
    <IsUrgent>false</IsUrgent> 
    <Items> 
     <RequestDataItem> 
      <AdditionalInfo/> 
      <Container/> 
      <Description>Ferritin [Serum]</Description> 
      <LIMSDeptName>CHM</LIMSDeptName> 
      <ProfileNumber>1293</ProfileNumber> 
      <QualifierCode/> 
      <SiteCode/> 
      <SpecimenType>Serum</SpecimenType> 
      <UniqueTest>False</UniqueTest> 
     </RequestDataItem> 
    </Items> 
    <Location>0</Location> 
    <LocationName>The INPS Practice</LocationName> 
    <LocationShortCode>W97046</LocationShortCode> 
    <LocationTelephone>01792602898</LocationTelephone> 
    <MiddleName /> 
    <NhsNumber>5240022631</NhsNumber> 
    <OrgCode>RRS</OrgCode> 
    <Placer>Dr Sarah Saturn</Placer> 
    <PostCode>CF31 5EP</PostCode> 
    <Sex>Male</Sex> 
    <Source>GPTR</Source> 
    <SurName>WILLIAMS</SurName> 
    <TelephoneNumber>01792776776</TelephoneNumber> 
</TestRequestPOCO>" 

有没有人有任何想法，我可以去掉这些，并拿出一串XML像上面。

在此先感谢。

Answer 1

要删除'null'值（即i：nil设置为true的值），您需要将这些数据成员的DataMemberAttribute上的“EmitDefaultValue”设置为false。在.NET Framework中，类型具有默认值的概念。例如，对于任何引用类型的默认值是零，而对于整数类型为0。

下面是一个例子：

[DataContract] 
public class Employee 
{ 
    // The CLR default for as string is a null value. 
    // This will be written as <employeeName xsi:nill="true" /> 
    [DataMember] 
    public string EmployeeName = null; 

    // This will be written as <employeeID>0</employeeID> 
    [DataMember] 
    public int employeeID = 0; 

    // The next three will not be written because the EmitDefaultValue = false. 
    [DataMember(EmitDefaultValue = false)] 
    public string position = null; 
    [DataMember(EmitDefaultValue = false)] 
    public int salary = 0; 
    [DataMember(EmitDefaultValue = false)] 
    public int? bonus = null; 

    // This will be written as <targetSalary>57800</targetSalary> 
    [DataMember(EmitDefaultValue = false)] 
    public int targetSalary = 57800; 
} 

我会确保你仔细想想，你这样做之前。原因是当EmitDefaultValue设置为false时，它在架构中表示为特定于Windows Communication Foundation（WCF）的注释。没有可互操作的方式来表示这些信息。特别是，模式中的“default”属性不用于此目的，minOccurs属性仅受IsRequired设置的影响，而nillable属性仅受数据成员类型的影响。

作为去除各种其他外来XML属性，你永远无法完全删除它，而是要像下面的代码可以帮助您确保这是在顶层发射只有一次：

注意如何突出显示的名称空间被定义了五次，当它只能在顶层定义一次时，会产生很多膨胀。要解决此问题，您可以使用以下代码：

ser.WriteStartObject(writer, o);  
writer.WriteAttributeString("xmlns", "p", null, "some-reaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaally-long-namespace.com/");  
ser.WriteObjectContent(writer, o);  
ser.WriteEndObject(writer);