C#保存与读取DataTable信息到XML格式的方法

本文实例讲述了C#保存与读取DataTable信息到XML格式的方法。分享给大家供大家参考。具体如下：

这里主要实现：

1.将DataTable中的信息保存到XML中

2.将以上述格式在XML中保存的信息读取到DataTable内

一、将DataTable的内容写入到XML文件中

/// <summary>
/// 将DataTable的内容写入到XML文件中
/// </summary>
/// <param name="dt">数据源</param>
/// <param name="address">XML文件地址</param>
public static bool WriteToXml(DataTable dt, string address)
{
 try
 {
  //如果文件DataTable.xml存在则直接删除
  if (File.Exists(address))
  {
   File.Delete(address);
  }
  XmlTextWriter writer = 
   new XmlTextWriter(address, Encoding.GetEncoding("GBK"));
  writer.Formatting = Formatting.Indented;
  //XML文档创建开始
  writer.WriteStartDocument();
  writer.WriteComment("DataTable: " + dt.TableName);
  writer.WriteStartElement("DataTable"); //DataTable开始
  writer.WriteAttributeString("TableName", dt.TableName);
  writer.WriteAttributeString("CountOfRows", dt.Rows.Count.ToString());
  writer.WriteAttributeString("CountOfColumns", dt.Columns.Count.ToString());
  writer.WriteStartElement("ClomunName", ""); //ColumnName开始
  for (int i = 0; i < dt.Columns.Count; i++)
  {
   writer.WriteAttributeString(
    "Column" + i.ToString(), dt.Columns[i].ColumnName);
  }
  writer.WriteEndElement(); //ColumnName结束
  //按行各行
  for (int j = 0; j < dt.Rows.Count; j++)
  {
   writer.WriteStartElement("Row" + j.ToString(), "");
   //打印各列
   for (int k = 0; k < dt.Columns.Count; k++)
   {
    writer.WriteAttributeString(
     "Column" + k.ToString(), dt.Rows[j][k].ToString());
   }
   writer.WriteEndElement();
  }
  writer.WriteEndElement(); //DataTable结束
  writer.WriteEndDocument();
  writer.Close();
  //XML文档创建结束
 }
 catch (Exception ex)
 {
  Console.WriteLine(ex.Message);
  return false;
 }
 return true;
}

二、将以上述格式在XML中保存的信息读取到DataTable内

/// <summary>
/// 从XML文件中读取一个DataTable
/// </summary>
/// <param name="dt">数据源</param>
/// <param name="address">XML文件地址</param>
/// <returns></returns>
public static DataTable ReadFromXml(string address)
{
 DataTable dt = new DataTable();
 try
 {
  if (!File.Exists(address))
  {
   throw new Exception("文件不存在!");
  }
  XmlDocument xmlDoc = new XmlDocument();
  xmlDoc.Load(address);
  XmlNode root = xmlDoc.SelectSingleNode("DataTable");
  //读取表名
  dt.TableName = ((XmlElement)root).GetAttribute("TableName");
  //Console.WriteLine("读取表名： {0}", dt.TableName);
  //读取行数
  int CountOfRows = 0;
  if (!int.TryParse(((XmlElement)root).
   GetAttribute("CountOfRows").ToString(), out CountOfRows))
  {
   throw new Exception("行数转换失败");
  }
  //读取列数
  int CountOfColumns = 0;
  if (!int.TryParse(((XmlElement)root).
   GetAttribute("CountOfColumns").ToString(), out CountOfColumns)) 
  {
   throw new Exception("列数转换失败");
  }
  //从第一行中读取记录的列名
  foreach (XmlAttribute xa in root.ChildNodes[0].Attributes)
  {
   dt.Columns.Add(xa.Value);
   //Console.WriteLine("建立列： {0}", xa.Value);
  }
  //从后面的行中读取行信息
  for (int i = 1; i < root.ChildNodes.Count; i++)
  {
   string[] array = new string[root.ChildNodes[0].Attributes.Count];
   for (int j = 0; j < array.Length; j++)
   {
    array[j] = root.ChildNodes[i].Attributes[j].Value.ToString();
   }
   dt.Rows.Add(array);
   //Console.WriteLine("行插入成功");
  }
 }
 catch (Exception ex)
 {
  Console.WriteLine(ex.Message);
  return new DataTable();
 }
 return dt;
}

三、Main函数调用

static void Main(string[] args)
{
 //1.将DataTable内容写入到XML文件
 //建立DataTable取名Table4Test
 DataTable dt1 = new DataTable("Table4Test");
 //生成四列，列名为Column0-3
 dt1.Columns.Add("Column0");
 dt1.Columns.Add("Column1");
 dt1.Columns.Add("Column2");
 dt1.Columns.Add("Column3");
 //生成四行
 dt1.Rows.Add("A0", "A1", "A2", "A3");
 dt1.Rows.Add("B0", "B1", "B2", "B3");
 dt1.Rows.Add("C0", "C1", "C2", "C3");
 //写入到XML
 if (WriteToXml(dt1, "DataTable.xml"))
 {
  Console.WriteLine("写入成功");
 }
 //================================
 //2.从XML文件中读取内容到DataTable
 //读取信息
 DataTable dt2 = ReadFromXml("DataTable.xml");
 //输出读取的信息
 Console.WriteLine("读取到的信息：");
 for (int i = 0; i < dt2.Rows.Count; i++)
 {
  for (int j = 0; j < dt2.Columns.Count; j++)
  {
   Console.Write(dt2.Rows[i][j].ToString() + "\t");
  }
  Console.WriteLine();
 }
 Console.ReadLine();
}

四、程序运行结果

程序运行结果

写入后的XML文件

希望本文所述对大家的C#程序设计有所帮助。