为XMl文档添加子节点，依据淘宝

protected void Page_Load(object sender, EventArgs e)
{
str_product();
}

conn co = new conn();
public void str_product()
{
//用SQL语句查询数据并转换成XML文档，保存起来
string str_pro = "select distinct(product_no),brand,product_type,product_class,price,price2,price4,memo from tbl_product_store where brand='KILLAH'";
DataSet ds = co.storenumshop(str_pro );
XmlDataDocument xmlDoc = new XmlDataDocument(ds);
xmlDoc.Save( Server.MapPath("data.xml") );//保存。
}

/// <summary>
/// 根据XML文档的货号添加对应的色质码，颜色，库存信息，
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button1_Click(object sender, EventArgs e)
{

//string product_no = "YIBT749085";//要查询的id值

//读取到XML文档
XmlDocument xml = new XmlDocument();
xml.Load(Server .MapPath ("data.xml"));
XmlNodeList xmlTable = xml.SelectNodes("NewDataSet/Table");
foreach (XmlNode table in xmlTable)
{
//取出货号，并根据货号来查询SKU值，每一个颜色，色质码，尺码对应一个SKU
string product_no = table.SelectSingleNode("product_no").InnerText;
//当节点是product_no的值是为上面值时，就可以去数据库查询信息
if (table.SelectSingleNode("product_no").InnerText == product_no)
{
//查询数据库信息
string str_sku = "select color,product_size,color2,number2,number from tbl_product_store where product_no='" + product_no + "'";
DataSet dr_sku = co.storenumshop (str_sku);
XmlNode skus = table.SelectSingleNode("skus");

if (skus == null)//如果没有，是新创建
{
skus = xml.CreateElement("skus");
}

int row_count = dr_sku.Tables[0].Rows.Count;

//以行数进行循环读取每一行每一个SKU值
for (int i = 0; i < row_count; i++)
{
//生成SKU节点，并插入到XMl文档里面
string color =dr_sku.Tables [0].Rows [i]["color"].ToString ();//绑定第一个字段
string product_size = dr_sku.Tables[0].Rows[i]["product_size"].ToString();
string color2 = dr_sku.Tables[0].Rows[i]["color2"].ToString();
string number = dr_sku.Tables[0].Rows[i]["number"].ToString();
string number2 = dr_sku.Tables[0].Rows[i]["number2"].ToString();

XmlElement sku = xml.CreateElement("sku");

XmlElement sku_created = xml.CreateElement("color");
sku_created.InnerText = color;
sku.AppendChild(sku_created);

XmlElement sku_created2 = xml.CreateElement("product_size");
sku_created2.InnerText = product_size;
sku.AppendChild(sku_created2);

XmlElement sku_created3 = xml.CreateElement("color2");
sku_created3.InnerText = color2;
sku.AppendChild(sku_created3);

XmlElement sku_created4 = xml.CreateElement("number");
sku_created4.InnerText = number.ToString();
sku.AppendChild(sku_created4);

XmlElement sku_created5 = xml.CreateElement("number2");
sku_created5.InnerText = number2.ToString();
sku.AppendChild(sku_created5);
skus.AppendChild(sku);

}

//根节点添加SKU节点
table.AppendChild(skus);

}

}
//保存XML文档
xml.Save(Server .MapPath ("data2.xml"));
}