DataTable 与XML 交互
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(); } |
