dataset中有多個表，返回XML字串設定主從關係

<?xml version="1.0" encoding="utf-8" ?><string xmlns="http://tempuri.org/">  <Getstore>    <Goods>      <product_no>FB22S58613</product_no>      <product_class>女鞋</product_class>      <SKU>        <product_no>FB22S58613</product_no>        <color>46</color>        <product_size>39</product_size>        <color1>46</color1>        <product_class>女鞋</product_class>        <number3>3</number3>        <number7>0</number7>        <number8>0</number8>        <number>50</number>        <number9>0</number9>      </SKU>      <SKU>        <product_no>FB22S58613</product_no>        <color>36</color>        <product_size>39</product_size>        <color1>36</color1>        <product_class>女鞋</product_class>        <number3>2</number3>        <number7>0</number7>        <number8>0</number8>        <number>50</number>        <number9>0</number9>      </SKU>    </Goods>  </Getstore></string>

 

DataSet ds = api.get_xmlstore(productno,color,productsize,users,user_key);             ds.Tables[0].TableName = "Goods";             ds.Tables[1].TableName = "SKU";             DataRelation relation = new DataRelation("SKU",             ds.Tables [0].Columns["product_no"],             ds.Tables[1].Columns["product_no"]);             relation.Nested = true;              ds.Relations.Add(relation);             ds.DataSetName = "Getstore";             XmlDataDocument xda = new XmlDataDocument(ds);