Read and Write XML file! Help!

[kleptos]

I am writing a small application, it has 4 text boxes and a button. On press of the button, i would like to be able to write the 4 values to an XML file. Tomorrow i would like to do it again, and again the next day. I know the structure of an XML file. I can write them in my sleep (well, basic ones anyway). I would like to have my application write to an XML file. Any real good examples floating around? I prefer any C# examples if possible. Thank you in advance for any and all help on this issue.

[iebidan]

Here is an example I found on how to read a XML File

 

namespace HowTo.Samples.XML
{

using System;
using System.IO;
using System.Xml;

public class ReadXmlFileSample
{
   private const string document = "books.xml";

   public static void Main()
   {
       ReadXmlFileSample myReadXmlFileSample = new ReadXmlFileSample();
       myReadXmlFileSample.Run(document);
   }

   public void Run(String args)
   {
       XmlTextReader reader = null;

       try
       {
           // Load the file with an XmlTextReader
           Console.WriteLine ("Reading file {0} ...", args);
           reader = new XmlTextReader (args);
           Console.WriteLine ("File {0} read sucessfully ...", args);

           // Process the supplied XML file
           Console.WriteLine ("Processing ...");
           Console.WriteLine ();
           FormatXml(reader, args);
       }
       catch (Exception e)
       {
           Console.WriteLine ("Failed to read the file {0}", args);
           Console.WriteLine ("Exception: {0}", e.ToString());
       }

       finally
       {
           Console.WriteLine();
           Console.WriteLine("Processing of the file {0} complete.", args);
           // Finished with XmlTextReader
           if (reader != null)
               reader.Close();
       }
   }

   private static void FormatXml (XmlReader reader, String filename)
   {
       int declarationCount=0, piCount=0, docCount=0, commentCount=0, elementCount=0, attributeCount=0, textCount=0, whitespaceCount=0;

       while (reader.Read())
       {
           switch (reader.NodeType)
           {
           case XmlNodeType.XmlDeclaration:
               Format (reader, "XmlDeclaration");
               declarationCount++;
               break;
           case XmlNodeType.ProcessingInstruction:
               Format (reader, "ProcessingInstruction");
               piCount++;
               break;
           case XmlNodeType.DocumentType:
               Format (reader, "DocumentType");
               docCount++;
               break;
           case XmlNodeType.Comment:
               Format (reader, "Comment");
               commentCount++;
               break;
           case XmlNodeType.Element:
               Format (reader, "Element");
               elementCount++;
               if (reader.HasAttributes)
                   attributeCount += reader.AttributeCount;
               break;
           case XmlNodeType.Text:
               Format (reader, "Text");
               textCount++;
               break;
           case XmlNodeType.Whitespace:
               whitespaceCount++;
               break;
           }
       }

       // Display the Statistics for the file.
       Console.WriteLine ();
       Console.WriteLine("Statistics for {0} file", filename);
       Console.WriteLine ();
       Console.WriteLine("XmlDeclaration: {0}",declarationCount++);
       Console.WriteLine("ProcessingInstruction: {0}",piCount++);
       Console.WriteLine("DocumentType: {0}",docCount++);
       Console.WriteLine("Comment: {0}",commentCount++);
       Console.WriteLine("Element: {0}",elementCount++);
       Console.WriteLine("Attribute: {0}",attributeCount++);
       Console.WriteLine("Text: {0}",textCount++);
       Console.WriteLine("Whitespace: {0}",whitespaceCount++);
   }

   private static void Format(XmlReader reader, String nodeType)
   {
       // Format the output
       Console.Write(reader.Depth + " ");
       Console.Write(reader.AttributeCount + " ");
       for (int i=0; i < reader.Depth; i++)
       {
           Console.Write('\t');
       }

       Console.Write(reader.Prefix + nodeType + "<" + reader.Name + ">" + reader.Value);

       // Display the attributes values for the current node
       if (reader.HasAttributes)
       {
           Console.Write(" Attributes:");

           for (int j=0; j < reader.AttributeCount; j++)
           {
               Console.Write(" [{0}] " + reader[j], j);
           }
       }
       Console.WriteLine();
   }

} // End class ReadXmlFileSample
} // End namespace HowTo.Samples.XML

[iebidan]

And this example on how to write a XML

 

namespace HowTo.Samples.XML
{

using System;
using System.IO;
using System.Xml;

public class WriteXmlFileSample
{
   private const string document = "newbooks.xml";

   public static void Main()
   {
       WriteXmlFileSample myWriteXmlFileSample = new WriteXmlFileSample();
       myWriteXmlFileSample.Run(document);
   }

   public void Run(String args)
   {
       XmlTextWriter myXmlTextWriter = null;
       XmlTextReader myXmlTextReader = null;

       try
       {
           myXmlTextWriter = new XmlTextWriter (args, null);

           myXmlTextWriter.Formatting = Formatting.Indented;
           myXmlTextWriter.WriteStartDocument(false);
           myXmlTextWriter.WriteDocType("bookstore", null, "books.dtd", null);
           myXmlTextWriter.WriteComment("This file represents another fragment of a book store inventory database");
           myXmlTextWriter.WriteStartElement("bookstore");
           myXmlTextWriter.WriteStartElement("book", null);
           myXmlTextWriter.WriteAttributeString("genre","autobiography");
           myXmlTextWriter.WriteAttributeString("publicationdate","1979");
           myXmlTextWriter.WriteAttributeString("ISBN","0-7356-0562-9");
           myXmlTextWriter.WriteElementString("title", null, "The Autobiography of Mark Twain");
           myXmlTextWriter.WriteStartElement("Author", null);
           myXmlTextWriter.WriteElementString("first-name", "Mark");
           myXmlTextWriter.WriteElementString("last-name", "Twain");
           myXmlTextWriter.WriteEndElement();
           myXmlTextWriter.WriteElementString("price", "7.99");
           myXmlTextWriter.WriteEndElement();
           myXmlTextWriter.WriteEndElement();

           //Write the XML to file and close the writer
           myXmlTextWriter.Flush();
           myXmlTextWriter.Close();

           // Read the file back in and parse to ensure well formed XML
           myXmlTextReader = new XmlTextReader (args);
           FormatXml (myXmlTextReader, args);
       }
       catch (Exception e)
       {
           Console.WriteLine ("Exception: {0}", e.ToString());
       }

       finally
       {
           Console.WriteLine();
           Console.WriteLine("Processing of the file {0} complete.", args);
           if (myXmlTextReader != null)
               myXmlTextReader.Close();
           //Close the writer
           if (myXmlTextWriter != null)
               myXmlTextWriter.Close();
       }
   }

   private static void FormatXml (XmlTextReader reader, String filename)
   {
       int piCount=0, docCount=0, commentCount=0, elementCount=0, attributeCount=0, textCount=0, whitespaceCount=0;

       while (reader.Read())
       {
           switch (reader.NodeType)
           {
           case XmlNodeType.ProcessingInstruction:
               Format (reader, "ProcessingInstruction");
               piCount++;
               break;
           case XmlNodeType.DocumentType:
               Format (reader, "DocumentType");
               docCount++;
               break;
           case XmlNodeType.Comment:
               Format (reader, "Comment");
               commentCount++;
               break;
           case XmlNodeType.Element:
               Format (reader, "Element");
               while(reader.MoveToNextAttribute())
               {
                   Format (reader, "Attribute");
               }
               elementCount++;
               
               if (reader.HasAttributes)
                   attributeCount += reader.AttributeCount;
               break;
           case XmlNodeType.Text:
               Format (reader, "Text");
               textCount++;
               break;
           case XmlNodeType.Whitespace:
               whitespaceCount++;
               break;
           }
       }

       // Display the Statistics for the file
       Console.WriteLine ();
       Console.WriteLine("Statistics for {0} file", filename);
       Console.WriteLine ();
       Console.WriteLine("ProcessingInstruction: {0}",piCount++);
       Console.WriteLine("DocumentType: {0}",docCount++);
       Console.WriteLine("Comment: {0}",commentCount++);
       Console.WriteLine("Element: {0}",elementCount++);
       Console.WriteLine("Attribute: {0}",attributeCount++);
       Console.WriteLine("Text: {0}",textCount++);
       Console.WriteLine("Whitespace: {0}",whitespaceCount++);
   }

   // Format the output
   private static void Format(XmlReader reader, String NodeType)
   {
       // Format the output
       Console.Write(reader.Depth + " ");
       Console.Write(reader.AttributeCount + " ");

       for (int i=0; i < reader.Depth; i++)
       {
           Console.Write('\t');
       }

       Console.Write(reader.Prefix + NodeType + "<" + reader.Name + ">" + reader.Value);
       Console.WriteLine();
   }

} // End class WriteXmlFileSample
} // End namespace HowTo.Samples.XML

[kleptos]

Thank you very much! This should help me out in my quest!