根据数据库生成xml二法

SqlConnection conn = new SqlConnection();

conn.ConnectionString = "Server=127.0.0.1;User ID=sa;Password=fdahgdrethj31313210212121;Database=northwind;Persist Security Info=True";

conn.Open();

SqlDataAdapter da = new SqlDataAdapter("select * from 表", conn);

SqlCommandBuilder thisBulder = new SqlCommandBuilder(da);

DataSet ds = new DataSet();

da.Fill(ds);

ds.WriteXml(@"C:\temp.xml");

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private void WriteXmlToFile(DataSet thisDataSet) {

if (thisDataSet == null) { return; }

// Create a file name to write to.

string filename = "myXmlDoc.xml";

// Create the FileStream to write with.

System.IO.FileStream myFileStream = new System.IO.FileStream

(filename, System.IO.FileMode.Create);

// Create an XmlTextWriter with the fileStream.

System.Xml.XmlTextWriter myXmlWriter =

new System.Xml.XmlTextWriter(myFileStream, System.Text.Encoding.Unicode);

// Write to the file with the WriteXml method.

thisDataSet.WriteXml(myXmlWriter);

myXmlWriter.Close();

}