ASP.NET把DataTable转成XML文件的函数

下面我将用ASP.NET把DataTable的数据转成XML格式，并输出生成XML文件。

数据库表position有三个字段：

字段名 字段类型
position_id int
position_name varchar
position_desc varchar

下面是Datatable转XML的生成源码：

C# Code [http://www.xueit.com]

protected void Page_Load(object sender, EventArgs e)
{
//通过数据访问层把position读取到Datatable
BizRules.PersonnelDAL pl = new PersonnelDAL();
DataTable dt = pl.Getposition();
StringBuilder str = new StringBuilder();
str.Append(DataTableToXml(dt));
this.CreateXml(str.ToString(), "test.xml");
Response.Write("生成test.xml成功");
}

/// <summary>
/// 生成文件
/// </summary>
/// <param name="val"></param>
/// <param name="filename"></param>
public void CreateXml(string val, string filename)
{
UnicodeEncoding ucode = new UnicodeEncoding();
StreamWriter sw = new StreamWriter(Server.MapPath(filename));
sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
sw.WriteLine(val);
sw.Close();
sw.Dispose();
}

/// <summary>
/// 转换成XML格式字符串
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public string DataTableToXml(DataTable dt)
{
StringBuilder strXml = new StringBuilder();
strXml.AppendLine("<XmlTable>");
for (int i = 0; i < dt.Rows.Count; i )
{
strXml.AppendLine(" <rows>");
for (int j = 0; j < dt.Columns.Count; j )
{
strXml.AppendLine(" <" dt.Columns[j].ColumnName ">" dt.Rows[i][j] "</" dt.Columns[j].ColumnName ">");
}
strXml.AppendLine(" </rows>");
}
strXml.AppendLine("</XmlTable>");
return strXml.ToString();
}
下面看下生成XML文件的效果：

<?xml version="1.0" encoding="utf-8"?>
<XmlTable>
<rows>
<position_id>29</position_id>
<position_name>业务员</position_name>
<position_desc></position_desc>
</rows>
<rows>
<position_id>30</position_id>
<position_name>业务经理</position_name>
<position_desc></position_desc>
</rows>
<rows>
<position_id>31</position_id>
<position_name>业务总监</position_name>
<position_desc></position_desc>
</rows>
</XmlTable>