How to display null values in xml using dataset

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I'm having an issue relating a xml document, i want to show null values ( they dont show up on xml structure ) as an empty string or something,

Example:

XML

<?xml version="1.0" standalone="yes"?>
<SerialisedData>
  <xs:schema id="SerialisedData" 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:element name="SerialisedData" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="Table1" msprop:BaseTable.0="TABLE_NAME" msprop:BaseSchema="SCHEMA_NAME">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="FILE" msprop:OraDbType="126" msprop:BaseColumn="FILE" type="xs:string" minOccurs="0" />
                <xs:element name="BBid" msprop:OraDbType="113" msprop:BaseColumn="BBid" type="xs:long" minOccurs="0" />
                <xs:element name="trnid" msprop:OraDbType="113" msprop:BaseColumn="trnid" type="xs:long" minOccurs="0" />
                <xs:element name="stnid" msprop:OraDbType="113" msprop:BaseColumn="stnid" type="xs:long" minOccurs="0" />
                <xs:element name="PIGGYBACK" msprop:OraDbType="126" msprop:BaseColumn="PIGGYBACK" type="xs:string" minOccurs="0" />
                <xs:element name="PAY_TYPE" msprop:OraDbType="126" msprop:BaseColumn="PAY_TYPE" type="xs:string" minOccurs="0" />
                <xs:element name="AMT" msprop:OraDbType="107" msprop:BaseColumn="AMT" type="xs:decimal" minOccurs="0" />
                <xs:element name="POSNUMBER" msprop:OraDbType="126" msprop:BaseColumn="POSNUMBER" type="xs:string" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>

<Table1>
  <BBid>503101</BBid>
    <trnid>1377982613101</trnid>
    <stnid>13100</stnid>
    <PAY_TYPE>01</PAY_TYPE>
    <AMT>10000</AMT>
    <POSNUMBER>CCT001</POSNUMBER>
  </Table1>
  <Table1>
  <BBid>573101</BBid>
    <trnid>1377982723101</trnid>
    <stnid>13100</stnid>
    <PAY_TYPE>01</PAY_TYPE>
    <AMT>1000</AMT>
    <POSNUMBER>CCT001</POSNUMBER>
  </Table1>

I want to display like this (including the PIGGYBACK column):

<Table1>
 <BBid>573101</BBid>
    <trnid>1377982763101</trnid>
    <stnid>13100</stnid>
    <PAY_TYPE>01</PAY_TYPE>
    <AMT>9000</AMT>
    <POSNUMBER>CCT001</POSNUMBER>
    <PIGGYBACK></PIGGYBACK>
  </Table1>

<Table1>
 <BBid>573101</BBid>
    <trnid>1377982763101</trnid>
    <stnid>13100</stnid>
    <PAY_TYPE>01</PAY_TYPE>
    <AMT>9000</AMT>
    <POSNUMBER>CCT001</POSNUMBER>
    <PIGGYBACK></PIGGYBACK>
  </Table1>

My PIGGYBACK column contains/returns null from the view/table (DataSet) and I am referencing this column in my code further down.

I use the following to Write the XML file:

ASM

DataSet ds = new DataSet("SerialisedData");
        ds.WriteXml(@"C:\FileName.XML", XmlWriteMode.WriteSchema);

To Read the file:

ASM

DataSet ds = new DataSet("SerialisedData");
            ds.ReadXml(@"C:\FileName.XML", XmlReadMode.ReadSchema);

How can I do this?

Thank you in advance for your help.

Thanks!

Posted 6-Apr-11 5:46am

Obopeng

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#realJSOP · Accepted Answer · 2011-04-06T05:55:00

I would create a class that represents the record (with all of the columns as properties, and provide an additional property that looks something like this):

C#

public XElement AsXElement
{
    get
    {
        XElement value = new XElement("BBid",
                                      new XElement("trnid", this.TrnID.ToString()),
                                      new XElement("stnid", this.StnID.ToString()),
                                      ...
                                      new XElement("PIGGYBACK", (this.PiggyBack == null)?"", this.PiggyBack.ToString())
                                     );
        return value;
    }
}

I do it this way all the time.

There may be a better way...

I also have some extension functions that allow me to set the properties in the object from XML and they're used to handle null values and provide exception handling during the setting process.

Using Extension Methods To Avoid XML Problems[^]