Read XML in C# [Answered]RSS

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  psm_8210

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  Read XML in C#

  Dec 20, 2013 12:42 AM|psm_8210|LINK

  Hello All

  I am new to XML. I have a task where I need to get the value of EmpID using either XML query or Linq in C#. Could anyone help on this.

  <DataChange>
      <Commands>
          <Command>
              <Tables>
                  <Table name="EMPLOYEE">
                      <Fields>
                          <Field name="ID" recordIdentifier="True">61</Field>
                          <Field name="EmpID" recordIdentifier="True">34</Field>
                          <Field name="BirthPlace">US</Field>
                      </Fields>
                  </Table>
              </Tables>
          </Command>
      </Commands>
  </DataChange>

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  A2H

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  Re: Read XML in C#

  Dec 20, 2013 12:52 AM|A2H|LINK

  first covert your string to xml using XMLDocument  LoadXML method and You can use XNodeList to read the values from XML 

  Try with below code

  Ensure that you have added below space to your page before using below code

  using System.Xml;

  //Create XMLDocument Object
              XmlDocument xml = new XmlDocument();
              //Convert your String to XMl
              xml.LoadXml(@"<DataChange>
      <Commands>
          <Command>
              <Tables>
                  <Table name='EMPLOYEE'>
                      <Fields>
                          <Field name='ID' recordIdentifier='True'>61</Field>
                          <Field name='EmpID' recordIdentifier='True'>34</Field>
                          <Field name='BirthPlace'>US</Field>
                      </Fields>
                  </Table>
              </Tables>
          </Command>
      </Commands>
  </DataChange>");
              //Read the values into XML Node list
              XmlNodeList xnList = xml.SelectNodes("/DataChange/Commands/Command/Tables/Table/Fields");
              foreach (XmlNode xn in xnList)
              {
                  //Get the ID Element Value
                  var ID = xn.ChildNodes[0].InnerText;
              }

  • Working Demo
  Thanks,
  Aje
  My Blog | Dotnet Funda
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  kaushalparik...

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  Re: Read XML in C#

  Dec 20, 2013 12:56 AM|kaushalparik27|LINK

  You can accomplish that with a single line of code with XPath as:

  protected void Page_Load(object sender, EventArgs e)
      {
          string strXML = "<DataChange><Commands><Command><Tables><Table name=\"EMPLOYEE\"><Fields><Field name=\"ID\" recordIdentifier=\"True\">61</Field><Field name=\"EmpID\" recordIdentifier=\"True\">34</Field><Field name=\"BirthPlace\">US</Field></Fields></Table></Tables></Command></Commands></DataChange>";
          XElement xElem = XElement.Parse(strXML);
          string empID = xElem.XPathSelectElement("Commands/Command/Tables/Table/Fields/Field[@name = 'EmpID']").Value;
      }

  You will require to add this namespace:

  using System.Xml.Linq;
  using System.Xml.XPath;

  And if you have multiple tables in the xml then you can add that condition as well for table name as:

  string empID = xElem.XPathSelectElement("Commands/Command/Tables/Table[@name='EMPLOYEE']/Fields/Field[@name = 'EmpID']").Value;

  It is important to note here that Xml is Case Sensitive.. so, it will require to write the xpath in exact case that we have in xml

  hope it helps./.

  नमस्ते,
  [KaushaL] Blog Twitter [MS MVP 2008 & 2009] [MCC 2011] [MVP Reconnect 2017]
  Don't forget to click "Mark as Answer" on the post that helped you
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  psm_8210

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  Re: Read XML in C#

  Dec 20, 2013 01:09 AM|psm_8210|LINK

  Thanks Kaushal,

  One question. the XML content is in the XML file. Do I need to load the XML into the string (strXML). What is XML is huge.

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  kaushalparik...

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  Re: Read XML in C#

  Dec 20, 2013 01:20 AM|kaushalparik27|LINK

  You can definately read the XML from XML file. If the XML is huge then it should be in file only. Here is the way you can read it from XML file:

  XElement xElem =  XElement.Parse(System.IO.File.ReadAllText(Server.MapPath("~/Your_File_Path.xml")));

  hope it helps./.

  नमस्ते,
  [KaushaL] Blog Twitter [MS MVP 2008 & 2009] [MCC 2011] [MVP Reconnect 2017]
  Don't forget to click "Mark as Answer" on the post that helped you
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  psm_8210

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  Re: Read XML in C#

  Dec 20, 2013 01:52 AM|psm_8210|LINK

  Thanks Kaushal,

  one last query. Is it possible to overwrite xml data at the path Commands/Command/Tables/Table/Fields/Field[@name = 'EmplId'] and create a new xml file ?

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  kaushalparik...

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  Re: Read XML in C#

  Dec 20, 2013 01:57 AM|kaushalparik27|LINK

  psm_8210

  Is it possible to overwrite xml data at the path Commands/Command/Tables/Table/Fields/Field[@name = 'EmplId'] and create a new xml file ?

  Sure. Below is example where I have changed the value of EmpID and writing it back/overwriting to xml file:

  XElement xElem =  XElement.Parse(System.IO.File.ReadAllText(Server.MapPath("~/Your_File_Path.xml")));
          xElem.XPathSelectElement("Commands/Command/Tables/Table[@name='EMPLOYEE']/Fields/Field[@name = 'EmpID']").Value = "999";
          System.IO.File.WriteAllText(Server.MapPath("~/Your_File_Path.xml"),xElem.ToString());

  hope it helps./.

  नमस्ते,
  [KaushaL] Blog Twitter [MS MVP 2008 & 2009] [MCC 2011] [MVP Reconnect 2017]
  Don't forget to click "Mark as Answer" on the post that helped you
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  psm_8210

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  Re: Read XML in C#

  Dec 20, 2013 02:05 AM|psm_8210|LINK

  Many Thanks,

  Everthing seems to be working as you said. I will do the analysis of your solution and make the code changes accordingly. :)