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。
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