Xml与DataTable相互转换方法

最新推荐文章于 2025-08-08 22:07:46 发布

sam1012

最新推荐文章于 2025-08-08 22:07:46 发布

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分类专栏： WPF 文章标签： xml dataset string schema exception null

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本文介绍了一种将XML文件转换为DataTable的方法，并提供了详细的代码实现。通过分析XML结构，文章展示了如何创建DataTable并填充数据，同时涉及了XML验证和转换为XML架构的过程。

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Xml文件：xmlsample.xml

代码

<music>
  <song>
    <artist>The Chi-lites</artist>
    <genre>Soul</genre>
    <album>A lonely man</album>
    <year>1972</year>
  </song>
  <song>
    <artist>Babyface</artist>
    <genre>R&amp;B</genre>
    <album>unknown</album>
    <year></year>
  </song>
  <song>
    <artist>Babyface</artist>
    <genre>R&amp;B</genre>
    <album>The essential babyface</album>
    <year>2001</year>
  </song>
  <song>
    <artist>Babyface</artist>
    <genre>R&amp;B</genre>
    <album>Grown and sexy</album>
    <year>2005</year>
  </song>
  <song>
    <artist>Maria Arredondo</artist>
    <genre>Pop</genre>
    <album>Not going under</album>
    <year>2004</year>
  </song>
  <song>
    <artist>Leona Lewis</artist>
    <genre>Pop</genre>
    <album>Unknown</album>
    <year>2008</year>
  </song>
  <song>
    <artist>Usher</artist>
    <genre>R&amp;B</genre>
    <album>Usher</album>
    <year>2008</year>
  </song>
  <song>
    <artist>Christina Aguilera</artist>
    <genre>Blues</genre>
    <album>Back to basics</album>
    <year>2004</year>
  </song>
  <song>
    <artist>Sting</artist>
    <genre>Pop</genre>
    <album>Shape of my heart</album>
    <year></year>
  </song>
</music>

代码文件：

代码

class Program
    {
        static void Main(string[] args)
        {
            VaildationXmlSchema();
        }

        // Xml结构的文件读到DataTable中
        static DataTable XmlToDataTableByFile()
        {
            string fileName = "E://xmlsample.xml";
            XmlDocument doc = new XmlDocument();
            doc.Load(fileName);

            DataTable dt = new DataTable("song");
            //以第一个元素song的子元素建立表结构
            XmlNode songNode = doc.SelectSingleNode("/music/song[1]");
            string colName;
            if (songNode != null)
            {
                for (int i = 0; i < songNode.ChildNodes.Count; i++)
                {
                    colName = songNode.ChildNodes.Item(i).Name;
                    dt.Columns.Add(colName);
                }
            }
            DataSet ds = new DataSet("music");
            ds.Tables.Add(dt);
            
            //Xml所有song元素的子元素读到表song中,当然用dt也可以读。
            ds.ReadXml(fileName);
            return dt;
        }
       
        // Xml结构的字符中读到DataTable中
        static void XmlToDataTableByString()
        {
            string fileName = "E://xmlsample.xml";
            XmlDocument doc = new XmlDocument();
            doc.Load(fileName);

            DataTable dt = new DataTable("song");
            //以第一个元素song的子元素建立表结构
            XmlNode songNode = doc.SelectSingleNode("/music/song[1]");
            string colName;
            if (songNode != null)
            {
                for (int i = 0; i < songNode.ChildNodes.Count; i++)
                {
                    colName = songNode.ChildNodes.Item(i).Name;
                    dt.Columns.Add(colName);
                }
            }
            DataSet ds = new DataSet();
            ds.Tables.Add(dt);

            //获取Xml字串
            string xmlString = doc.InnerXml;
            StringReader sr = new StringReader(xmlString);
            XmlTextReader xr = new XmlTextReader(sr);
            //Xml所有song元素的子元素读到表song中,当然用dt也可以读。
            ds.ReadXml(xr);
        }
        
        // DataTable转换成Xml结构的文本
        static void DataTableToXml()
        {
            //dt的名为song,ds的名为music
            DataTable dt = XmlToDataTableByFile();

            //保存Xml验证架构
            dt.WriteXmlSchema("E://xmlsample.xsd");

            //dt写成Xml结构
            System.IO.TextWriter tw = new System.IO.StringWriter();
            dt.WriteXml(tw);
            string xml = tw.ToString();
        }

        //验证Xml结构
        static void VaildationXmlSchema()
        {
            XmlSchemaSet set = new XmlSchemaSet();
            set.Add("", "E://xmlsample.xsd");

            XmlDocument doc = new XmlDocument();
            doc.Schemas = set;

            try
            {
                doc.Load("E://xmlsample.xml");
                doc.Validate(new ValidationEventHandler(Vaildation));
            }
            catch (Exception e)
            {
                Console.Write(e.Message);
            }
        }
        static void Vaildation(object sender, ValidationEventArgs e)
        {
            switch (e.Severity)
            {
                case XmlSeverityType.Error:
                    throw e.Exception;
                case XmlSeverityType.Warning:
                    throw e.Exception;
            }
        }
    }

生成的验证Xml文件：xmlsample.xsd

代码

<?xml version="1.0" standalone="yes"?>
<xs:schema id="music" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
  <xs:element name="music" msdata:IsDataSet="true" msdata:MainDataTable="song" msdata:UseCurrentLocale="true">
    <xs:complexType>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element name="song">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="artist" type="xs:string" minOccurs="0" />
              <xs:element name="genre" type="xs:string" minOccurs="0" />
              <xs:element name="album" type="xs:string" minOccurs="0" />
              <xs:element name="year" type="xs:string" minOccurs="0" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>