Why is DataSet loaded in C # with ReadXml empty?

Question

Why is DataSet loaded in C # with ReadXml empty?

I am using C # 4.5 / Visual Studio 2012 to try to load an XML file into a DataSet. I read the instructions here:

http://msdn.microsoft.com/en-us/library/fx29c3yd.aspx

I am loading an XML file that looks like this:

<?xml version="1.0" encoding="utf-8" ?> <UnitTestDataSet xmlns="https://rebuildinghomes.codeplex.com/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://rebuildinghomes.codeplex.com/ UnitTestLoadData.xsd"> <Person> <PersonId>1111</PersonId> <FirstName>Unit</FirstName> <LastName>Tester</LastName> </Person> </UnitTestDataSet>

With such a scheme:

 <?xml version="1.0" encoding="utf-8" ?> <xs:schema id="RebuildingUnitTestData" targetNamespace="https://rebuildinghomes.codeplex.com/" xmlns:u="https://rebuildinghomes.codeplex.com/" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:complexType name="PersonType"> <xs:sequence> <xs:element name="PersonId" type="xs:int" minOccurs="1" maxOccurs="1" /> <xs:element name="FirstName" type="xs:string" minOccurs="1" maxOccurs="1" /> <xs:element name="LastName" type="xs:string" minOccurs="1" maxOccurs="1" /> </xs:sequence> </xs:complexType> </xs:schema>

Using the following C # code:

  //Load init/expected DataSet init = new DataSet(); init.ReadXmlSchema("RebuildingModel/Data/UnitTestLoadData.xsd"); init.ReadXml("RebuildingModel/Data/PersonUnitTest.xml", XmlReadMode.ReadSchema);

However, when I look at "init" in the debugger, the DataSet is empty. What am I doing wrong?

+4

c # xml dataset

Brad 25 sept. '13 at 19:10

source share

3 answers

Unfortunately, your code snippet seems to work on my machine. Are you sure you will check init AFTER by running init.ReadXml ()?

See my output from my immediate Visual Studio window below:

 ds.Tables[0] {Person} base {System.ComponentModel.MarshalByValueComponent}: {Person} CaseSensitive: false ChildRelations: {System.Data.DataRelationCollection.DataTableRelationCollection} Columns: {System.Data.DataColumnCollection} Constraints: {System.Data.ConstraintCollection} DataSet: {System.Data.DataSet} DefaultView: {System.Data.DataView} DisplayExpression: "" ExtendedProperties: Count = 0 HasErrors: false IsInitialized: true Locale: {en-US} MinimumCapacity: 50 Namespace: "https://rebuildinghomes.codeplex.com/" ParentRelations: {System.Data.DataRelationCollection.DataTableRelationCollection} Prefix: "" PrimaryKey: {System.Data.DataColumn[0]} RemotingFormat: Xml Rows: {System.Data.DataRowCollection} Site: null TableName: "Person" ds.Tables[0].Rows {System.Data.DataRowCollection} base {System.Data.InternalDataCollectionBase}: {System.Data.DataRowCollection} Count: 1

My DataSet is populated with a single table containing one row according to your XML.

+1

Ravb 25 sept. '13 at 19:27

source share

Could this be the following:

 xsi:schemaLocation="https://rebuildinghomes.codeplex.com/ UnitTestLoadData.xsd">

from your xml file?

0

JustMeToo 25 sept. '13 at 19:24

source share

Brad · Accepted Answer · 2014-01-20T19:13:19+0000

I finally figured it out.

Now the circuit is as follows:

 <?xml version="1.0" encoding="utf-8"?> <xs:schema id="UnitTestDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop"> <xs:annotation> <xs:appinfo source="urn:schemas-microsoft-com:xml-msdatasource"> <DataSource DefaultConnectionIndex="0" FunctionsComponentName="QueriesTableAdapter" Modifier="AutoLayout, AnsiClass, Class, Public" SchemaSerializationMode="IncludeSchema" xmlns="urn:schemas-microsoft-com:xml-msdatasource"> <Connections /> <Tables /> <Sources /> </DataSource> </xs:appinfo> </xs:annotation> <xs:element name="UnitTestDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true" msprop:Generator_DataSetName="UnitTestDataSet" msprop:Generator_UserDSName="UnitTestDataSet"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="Person" msprop:Generator_TableClassName="PersonDataTable" msprop:Generator_TableVarName="tablePerson" msprop:Generator_TablePropName="Person" msprop:Generator_RowDeletingName="PersonRowDeleting" msprop:Generator_RowChangingName="PersonRowChanging" msprop:Generator_RowEvHandlerName="PersonRowChangeEventHandler" msprop:Generator_RowDeletedName="PersonRowDeleted" msprop:Generator_UserTableName="Person" msprop:Generator_RowChangedName="PersonRowChanged" msprop:Generator_RowEvArgName="PersonRowChangeEvent" msprop:Generator_RowClassName="PersonRow"> <xs:complexType> <xs:sequence> <xs:element name="PersonId" msprop:Generator_ColumnVarNameInTable="columnPersonId" msprop:Generator_ColumnPropNameInRow="PersonId" msprop:Generator_ColumnPropNameInTable="PersonIdColumn" msprop:Generator_UserColumnName="PersonId" type="xs:int" /> <xs:element name="FirstName" msprop:Generator_ColumnVarNameInTable="columnFirstName" msprop:Generator_ColumnPropNameInRow="FirstName" msprop:Generator_ColumnPropNameInTable="FirstNameColumn" msprop:Generator_UserColumnName="FirstName" type="xs:string" /> <xs:element name="LastName" msprop:Generator_ColumnVarNameInTable="columnLastName" msprop:Generator_ColumnPropNameInRow="LastName" msprop:Generator_ColumnPropNameInTable="LastNameColumn" msprop:Generator_UserColumnName="LastName" type="xs:string" /> <xs:element name="HomePhoneNbr" msprop:Generator_ColumnVarNameInTable="columnHomePhoneNbr" msprop:Generator_ColumnPropNameInRow="HomePhoneNbr" msprop:Generator_ColumnPropNameInTable="HomePhoneNbrColumn" msprop:Generator_UserColumnName="HomePhoneNbr" type="xs:string" minOccurs="0" /> <xs:element name="CellPhoneNbr" msprop:Generator_ColumnVarNameInTable="columnCellPhoneNbr" msprop:Generator_ColumnPropNameInRow="CellPhoneNbr" msprop:Generator_ColumnPropNameInTable="CellPhoneNbrColumn" msprop:Generator_UserColumnName="CellPhoneNbr" type="xs:string" minOccurs="0" /> <xs:element name="StreetAddress" msprop:Generator_ColumnVarNameInTable="columnStreetAddress" msprop:Generator_ColumnPropNameInRow="StreetAddress" msprop:Generator_ColumnPropNameInTable="StreetAddressColumn" msprop:Generator_UserColumnName="StreetAddress" type="xs:string" minOccurs="0" /> <xs:element name="AptNbr" msprop:Generator_ColumnVarNameInTable="columnAptNbr" msprop:Generator_ColumnPropNameInRow="AptNbr" msprop:Generator_ColumnPropNameInTable="AptNbrColumn" msprop:Generator_UserColumnName="AptNbr" type="xs:string" minOccurs="0" /> <xs:element name="City" msprop:Generator_ColumnVarNameInTable="columnCity" msprop:Generator_ColumnPropNameInRow="City" msprop:Generator_ColumnPropNameInTable="CityColumn" msprop:Generator_UserColumnName="City" type="xs:string" minOccurs="0" /> <xs:element name="County" msprop:Generator_ColumnVarNameInTable="columnCounty" msprop:Generator_ColumnPropNameInRow="County" msprop:Generator_ColumnPropNameInTable="CountyColumn" msprop:Generator_UserColumnName="County" type="xs:string" minOccurs="0" /> <xs:element name="StateProvCd" msprop:Generator_ColumnVarNameInTable="columnStateProvCd" msprop:Generator_ColumnPropNameInRow="StateProvCd" msprop:Generator_ColumnPropNameInTable="StateProvCdColumn" msprop:Generator_UserColumnName="StateProvCd" type="xs:string" minOccurs="0" /> <xs:element name="PostalCode" msprop:Generator_ColumnVarNameInTable="columnPostalCode" msprop:Generator_ColumnPropNameInRow="PostalCode" msprop:Generator_ColumnPropNameInTable="PostalCodeColumn" msprop:Generator_UserColumnName="PostalCode" type="xs:string" minOccurs="0" /> <xs:element name="CountryCode" msprop:Generator_ColumnVarNameInTable="columnCountryCode" msprop:Generator_ColumnPropNameInRow="CountryCode" msprop:Generator_ColumnPropNameInTable="CountryCodeColumn" msprop:Generator_UserColumnName="CountryCode" type="xs:string" minOccurs="0" /> <xs:element name="NumberOfYearsAtAddr" msprop:Generator_ColumnVarNameInTable="columnNumberOfYearsAtAddr" msprop:Generator_ColumnPropNameInRow="NumberOfYearsAtAddr" msprop:Generator_ColumnPropNameInTable="NumberOfYearsAtAddrColumn" msprop:Generator_UserColumnName="NumberOfYearsAtAddr" type="xs:int" minOccurs="0" /> <xs:element name="EmailAddress" msprop:Generator_ColumnVarNameInTable="columnEmailAddress" msprop:Generator_ColumnPropNameInRow="EmailAddress" msprop:Generator_ColumnPropNameInTable="EmailAddressColumn" msprop:Generator_UserColumnName="EmailAddress" type="xs:string" minOccurs="0" /> <xs:element name="GenderCode" msprop:Generator_ColumnVarNameInTable="columnGenderCode" msprop:Generator_ColumnPropNameInRow="GenderCode" msprop:Generator_ColumnPropNameInTable="GenderCodeColumn" msprop:Generator_UserColumnName="GenderCode" type="xs:string" minOccurs="0" /> <xs:element name="EthnicityCode" msprop:Generator_ColumnVarNameInTable="columnEthnicityCode" msprop:Generator_ColumnPropNameInRow="EthnicityCode" msprop:Generator_ColumnPropNameInTable="EthnicityCodeColumn" msprop:Generator_UserColumnName="EthnicityCode" type="xs:int" minOccurs="0" /> <xs:element name="BirthDate" msprop:Generator_ColumnVarNameInTable="columnBirthDate" msprop:Generator_ColumnPropNameInRow="BirthDate" msprop:Generator_ColumnPropNameInTable="BirthDateColumn" msprop:Generator_UserColumnName="BirthDate" type="xs:date" minOccurs="0" /> <xs:element name="ResidentStatus" msprop:Generator_ColumnVarNameInTable="columnResidentStatus" msprop:Generator_ColumnPropNameInRow="ResidentStatus" msprop:Generator_ColumnPropNameInTable="ResidentStatusColumn" msprop:Generator_UserColumnName="ResidentStatus" type="xs:int" minOccurs="0" /> </xs:sequence> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> <xs:unique name="Constraint1" msdata:PrimaryKey="true"> <xs:selector xpath=".//Person" /> <xs:field xpath="PersonId" /> </xs:unique> </xs:element> </xs:schema> " msprop: Generator_ColumnVarNameInTable = "columnNumberOfYearsAtAddr" msprop: Generator_ColumnPropNameInRow = "NumberOfYearsAtAddr" msprop: Generator_ColumnPropNameInTable = "NumberOfYearsAtAddrColumn" msprop: Generator_UserColumnName = "NumberOfYearsAtAddr" type = "xs: int" minOccurs = " <?xml version="1.0" encoding="utf-8"?> <xs:schema id="UnitTestDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop"> <xs:annotation> <xs:appinfo source="urn:schemas-microsoft-com:xml-msdatasource"> <DataSource DefaultConnectionIndex="0" FunctionsComponentName="QueriesTableAdapter" Modifier="AutoLayout, AnsiClass, Class, Public" SchemaSerializationMode="IncludeSchema" xmlns="urn:schemas-microsoft-com:xml-msdatasource"> <Connections /> <Tables /> <Sources /> </DataSource> </xs:appinfo> </xs:annotation> <xs:element name="UnitTestDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true" msprop:Generator_DataSetName="UnitTestDataSet" msprop:Generator_UserDSName="UnitTestDataSet"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="Person" msprop:Generator_TableClassName="PersonDataTable" msprop:Generator_TableVarName="tablePerson" msprop:Generator_TablePropName="Person" msprop:Generator_RowDeletingName="PersonRowDeleting" msprop:Generator_RowChangingName="PersonRowChanging" msprop:Generator_RowEvHandlerName="PersonRowChangeEventHandler" msprop:Generator_RowDeletedName="PersonRowDeleted" msprop:Generator_UserTableName="Person" msprop:Generator_RowChangedName="PersonRowChanged" msprop:Generator_RowEvArgName="PersonRowChangeEvent" msprop:Generator_RowClassName="PersonRow"> <xs:complexType> <xs:sequence> <xs:element name="PersonId" msprop:Generator_ColumnVarNameInTable="columnPersonId" msprop:Generator_ColumnPropNameInRow="PersonId" msprop:Generator_ColumnPropNameInTable="PersonIdColumn" msprop:Generator_UserColumnName="PersonId" type="xs:int" /> <xs:element name="FirstName" msprop:Generator_ColumnVarNameInTable="columnFirstName" msprop:Generator_ColumnPropNameInRow="FirstName" msprop:Generator_ColumnPropNameInTable="FirstNameColumn" msprop:Generator_UserColumnName="FirstName" type="xs:string" /> <xs:element name="LastName" msprop:Generator_ColumnVarNameInTable="columnLastName" msprop:Generator_ColumnPropNameInRow="LastName" msprop:Generator_ColumnPropNameInTable="LastNameColumn" msprop:Generator_UserColumnName="LastName" type="xs:string" /> <xs:element name="HomePhoneNbr" msprop:Generator_ColumnVarNameInTable="columnHomePhoneNbr" msprop:Generator_ColumnPropNameInRow="HomePhoneNbr" msprop:Generator_ColumnPropNameInTable="HomePhoneNbrColumn" msprop:Generator_UserColumnName="HomePhoneNbr" type="xs:string" minOccurs="0" /> <xs:element name="CellPhoneNbr" msprop:Generator_ColumnVarNameInTable="columnCellPhoneNbr" msprop:Generator_ColumnPropNameInRow="CellPhoneNbr" msprop:Generator_ColumnPropNameInTable="CellPhoneNbrColumn" msprop:Generator_UserColumnName="CellPhoneNbr" type="xs:string" minOccurs="0" /> <xs:element name="StreetAddress" msprop:Generator_ColumnVarNameInTable="columnStreetAddress" msprop:Generator_ColumnPropNameInRow="StreetAddress" msprop:Generator_ColumnPropNameInTable="StreetAddressColumn" msprop:Generator_UserColumnName="StreetAddress" type="xs:string" minOccurs="0" /> <xs:element name="AptNbr" msprop:Generator_ColumnVarNameInTable="columnAptNbr" msprop:Generator_ColumnPropNameInRow="AptNbr" msprop:Generator_ColumnPropNameInTable="AptNbrColumn" msprop:Generator_UserColumnName="AptNbr" type="xs:string" minOccurs="0" /> <xs:element name="City" msprop:Generator_ColumnVarNameInTable="columnCity" msprop:Generator_ColumnPropNameInRow="City" msprop:Generator_ColumnPropNameInTable="CityColumn" msprop:Generator_UserColumnName="City" type="xs:string" minOccurs="0" /> <xs:element name="County" msprop:Generator_ColumnVarNameInTable="columnCounty" msprop:Generator_ColumnPropNameInRow="County" msprop:Generator_ColumnPropNameInTable="CountyColumn" msprop:Generator_UserColumnName="County" type="xs:string" minOccurs="0" /> <xs:element name="StateProvCd" msprop:Generator_ColumnVarNameInTable="columnStateProvCd" msprop:Generator_ColumnPropNameInRow="StateProvCd" msprop:Generator_ColumnPropNameInTable="StateProvCdColumn" msprop:Generator_UserColumnName="StateProvCd" type="xs:string" minOccurs="0" /> <xs:element name="PostalCode" msprop:Generator_ColumnVarNameInTable="columnPostalCode" msprop:Generator_ColumnPropNameInRow="PostalCode" msprop:Generator_ColumnPropNameInTable="PostalCodeColumn" msprop:Generator_UserColumnName="PostalCode" type="xs:string" minOccurs="0" /> <xs:element name="CountryCode" msprop:Generator_ColumnVarNameInTable="columnCountryCode" msprop:Generator_ColumnPropNameInRow="CountryCode" msprop:Generator_ColumnPropNameInTable="CountryCodeColumn" msprop:Generator_UserColumnName="CountryCode" type="xs:string" minOccurs="0" /> <xs:element name="NumberOfYearsAtAddr" msprop:Generator_ColumnVarNameInTable="columnNumberOfYearsAtAddr" msprop:Generator_ColumnPropNameInRow="NumberOfYearsAtAddr" msprop:Generator_ColumnPropNameInTable="NumberOfYearsAtAddrColumn" msprop:Generator_UserColumnName="NumberOfYearsAtAddr" type="xs:int" minOccurs="0" /> <xs:element name="EmailAddress" msprop:Generator_ColumnVarNameInTable="columnEmailAddress" msprop:Generator_ColumnPropNameInRow="EmailAddress" msprop:Generator_ColumnPropNameInTable="EmailAddressColumn" msprop:Generator_UserColumnName="EmailAddress" type="xs:string" minOccurs="0" /> <xs:element name="GenderCode" msprop:Generator_ColumnVarNameInTable="columnGenderCode" msprop:Generator_ColumnPropNameInRow="GenderCode" msprop:Generator_ColumnPropNameInTable="GenderCodeColumn" msprop:Generator_UserColumnName="GenderCode" type="xs:string" minOccurs="0" /> <xs:element name="EthnicityCode" msprop:Generator_ColumnVarNameInTable="columnEthnicityCode" msprop:Generator_ColumnPropNameInRow="EthnicityCode" msprop:Generator_ColumnPropNameInTable="EthnicityCodeColumn" msprop:Generator_UserColumnName="EthnicityCode" type="xs:int" minOccurs="0" /> <xs:element name="BirthDate" msprop:Generator_ColumnVarNameInTable="columnBirthDate" msprop:Generator_ColumnPropNameInRow="BirthDate" msprop:Generator_ColumnPropNameInTable="BirthDateColumn" msprop:Generator_UserColumnName="BirthDate" type="xs:date" minOccurs="0" /> <xs:element name="ResidentStatus" msprop:Generator_ColumnVarNameInTable="columnResidentStatus" msprop:Generator_ColumnPropNameInRow="ResidentStatus" msprop:Generator_ColumnPropNameInTable="ResidentStatusColumn" msprop:Generator_UserColumnName="ResidentStatus" type="xs:int" minOccurs="0" /> </xs:sequence> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> <xs:unique name="Constraint1" msdata:PrimaryKey="true"> <xs:selector xpath=".//Person" /> <xs:field xpath="PersonId" /> </xs:unique> </xs:element> </xs:schema>

The big thing that has changed, as you noticed, is all the unwantedness that Visual Studio adds. .NET seems to need some of this to load the data correctly, primarily annotating the primary key. So, the moral of this story is: if you are going to load a DataSet from XML, create a schema through Visual Studio or be prepared to run it through XSLT to add all this, or the results will be unpredictable at best.

Why is DataSet loaded in C # with ReadXml empty?

More articles: