DataSet与Xml之间的转换

DataSet与Xml之间的转换

                                         
     DataSet转化为Xml，Xml转化为DataSet，Ado.net中使用方法DataSet.WriteXml()和DataSet.ReadXml()，由于有多个重载方法，所以这里有多条路径可以实现，可谓条条大道通罗马。这里我就把所有的用法来尝试下，希望给大家有个借鉴作用。
     因为DataSet.ReadXml()和DataSet.WriteXml()共8种重载方法，前四种是不带架构的，后四种带架构。这里举出带架构的4种方法。
      /// <summary>
        /// DataSet和Xml之间的转换
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DsAndXml_Click(object sender, EventArgs e)
        {
            //自定义一个DataSet，里面有一列a，一行值为"hello world!"，Xml数据从这个数据集中来读取
            DataSet dsWrite = new DataSet();
            DataTable dt = new DataTable();
            dt.Columns.Add("a", typeof(string));
            DataRow dr = dt.NewRow();
            dr[0] = "hello world!";
            dt.Rows.Add(dr);
            dsWrite.Tables.Add(dt);
            //自定义一个DataSet用来从xml中读取数据
            DataSet dsRead = new DataSet();
            int k = Convert.ToInt32(this.textBox1.Text.ToString());//第几种重载
            switch(k)
            {
                //第一种使用stream
                case 1:
                    //创建文件流，将DataSet中的数据写入文件流中
                    Stream stream = new FileStream(@System.AppDomain.CurrentDomain.BaseDirectory.ToString()+"Test.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);
                    //dsWrite.WriteXml(stream);//不带架构
                    dsWrite.WriteXml(stream, XmlWriteMode.WriteSchema);//将架构一起写入文件流
                    stream.Close();
                    //从文件里读取
                    dsRead.ReadXml(@System.AppDomain.CurrentDomain.BaseDirectory.ToString() + "Test.txt");
                    break;
                //第二种使用FileName
                case 2:
                    //写出
                    dsWrite.WriteXml(@System.AppDomain.CurrentDomain.BaseDirectory.ToString() + "Test.txt");
                    //读入
                    dsRead.ReadXml(@System.AppDomain.CurrentDomain.BaseDirectory.ToString() + "Test.txt");
                    break;
               //第三种使用XmlTextWriter
                case 3:
                    //写出
                    StringBuilder s1 = new StringBuilder();
                    TextWriter tw1 = new StringWriter(s1);
                    System.Xml.XmlTextWriter xtw1= new System.Xml.XmlTextWriter(tw1);
                    dsWrite.WriteXml(xtw1,XmlWriteMode.WriteSchema);
                    string xml1 = s1.ToString();
                    //读入
                    TextReader tr1 = new StringReader(xml1);
                    dsRead.ReadXml(tr1,XmlReadMode.ReadSchema);
                    //System.Xml.XmlReader xr = System.Xml.XmlReader.Create(tr1);
                    //dsRead.ReadXml(xr);
                  
                    break;
                //第四种使用TextReader、TextWriter
                case 4:
                    //DataSet转化为xml
                    StringBuilder s = new StringBuilder();
                    TextWriter tw = new StringWriter(s);
                    dsWrite.WriteXml(tw, XmlWriteMode.WriteSchema);
                    string xml = s.ToString();
                    //xml转化为DataSet
                    TextReader tr = new StringReader(xml);
                    dsRead.ReadXml(tr,XmlReadMode.ReadSchema);
                    break;
                default:
                    break;
 
            }
        }