简单的XML问题，希望大家能帮解决

Question

现在有一个XML文件把它当作模板可向它里面添加节点，但当我点击保存按钮把文件存进数据库后，该怎样还原回模板？（即没有添加节点之前的样子）,新手,请说详细点.谢谢 
模板为：    
<root>    
      <element Name="F2" Description="记实测评" Score="5">    
        <element2 Name="F21" DesCription="必修项" Score="5">    
          <element3 Name="F211" Description="上课出勤情况" Score="0">    
          </element3>    
          <element3 Name="F212" Description="班集体活动参与情况" Score="0">    
          </element3>    
　　    <element2 Name="F22" DesCription="选修与附加项" Score="0">    
现在要添加节点：    
<root>    
      <element Name="F2" Description="记实测评" Score="10">    
        <element2 Name="F21" DesCription="必修项" Score="0">    
          <element3 Name="F211" Description="上课出勤情况" Score="0">    
          </element3>    
          <element3 Name="F212" Description="班集体活动参与情况" Score="0">    
          </element3>    
　　    <element2 Name="F22" DesCription="选修与附加项" Score="10">    
　　　    <element3 Name="F221" Description="全国三好学生" ContentID="1" Score="6" />  
         <element3 Name="F221" Description="省级三好学生" ContentID="1" Score="4" />   
       </element2>    
      </element>    
</root>   

Answer 1

       XmlDataDocument XD = new XmlDataDocument();
        XD.Load(Server.MapPath("模板.xml"));
        //....XML操作。
        //然后保存的时候
        XD.Save(Server.MapPath("结果.xml"));

Answer 2

我的意思不是这样的,是怎样将"结果.xml"还原为没有添加节点之前的模板?

Answer 3

DiffGram格式有回滚功能，楼主查查相关资料

Answer 4

具体能不能代码写一下哦，备份是用Clone吗？我怎么试了不成功

Answer 5

直接用clone不行 须通过加载复制节点的xml方式复制文件
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load("model.xml");
        XmlDocument tempXml = new XmlDocument();
        XmlNode node = xmlDoc.CloneNode(true);
        tempXml.LoadXml(node.InnerXml);        
        //……对tempXml的操作
        //……
        //tempXml.Save("C:\\tempModel.xml"); //可以保存来看看

Answer 6

刚才试了，报错路径中具有非法字符
XmlDocument BackUpXml = new XmlDocument();//BackUpXml备份文件
        BackUpXml.Load(Server.MapPath("~/XML/BackUp.xml"));
        XmlDocument xmlDoc = new XmlDocument();
        XmlNode node = BackUpXml.CloneNode(true);
        xmlDoc.Load(node.InnerXml);  //这里提示System.ArgumentException: 路径中具有非法字符 

Answer 7

那应该是你的BackUpXml.Load(Server.MapPath("~/XML/BackUp.xml")); 这句的问题
可以直接写BackUpXml.Load(@"~/XML/BackUp.xml"); 

Answer 8

BackUpXml.Load(Server.MapPath("~/XML/BackUp.xml")); 没有错的，因为之前在相同路径下我做过没错．
是不是（node.InnerXml）这里有问题呢？

Answer 9

为了方便大家给我找原因，我把代码帖出来，这问题捆扰我好多天了，希望能在大家帮助下早点解决   
 protected void Button1_Click(object sender, EventArgs e)
    {
        XmlDocument BackUpXml = new XmlDocument();//BackUpXml备份文件
        BackUpXml.Load(Server.MapPath("~/XML/BackUp.xml"));
        XmlDocument xmlDoc = new XmlDocument();
        XmlNode node = BackUpXml.CloneNode(true);
        xmlDoc.Load(node.InnerXml);  //这里提示System.ArgumentException: 路径中具有非法字符   
        XmlNodeList xnl = xmlDoc.SelectSingleNode("root").ChildNodes;
        int attr = 0;
        int attr2 = 0;
        int f1 = 0;
        string sum;
        int allvalue = 0;
        foreach (XmlNode xn in xnl)//遍历XML中属于root的每个节点
        {
            XmlElement xe = (XmlElement)xn;
            XmlNodeList xnl1 = xe.ChildNodes;
            foreach (XmlNode xn1 in xnl1)//遍历XML中属于F2的每个节点　
            {
                XmlElement xe2 = (XmlElement)xn1;
                XmlNodeList xnl2 = xe2.ChildNodes;
                if (xe2.Attributes["Name"].Value != "F22")
                {
                    continue;
                }
                else
                {
                    DropDownList aDropdown1 = (DropDownList)GridView2.Rows[0].Cells[1].FindControl("DropDownList1");
                    DropDownList aDropdown2 = (DropDownList)GridView2.Rows[0].Cells[2].FindControl("DropDownList2");
                    int f = 0;
                    string aRank = aDropdown1.SelectedItem.ToString();
                    string aContent = aDropdown2.SelectedItem.ToString();
                    int aRankID;
                    int aContentID;
                    aRankID = Convert.ToInt32(aDropdown1.SelectedValue);
                    aContentID = Convert.ToInt32(aDropdown2.SelectedValue);
                    XmlElement xe3 = xmlDoc.CreateElement("element3");
                    xe3.SetAttribute("Name", "F221");
                    xe3.SetAttribute("Description", (aRank + aContent));
                    xe3.SetAttribute("ContentID", aContentID.ToString());
                    SqlConnection con = new SqlConnection("Data Source=DONG;Initial Catalog=eSchool_SynthesisEvaluation;User ID=sa;Password=123456");                    SqlCommand cmd = new SqlCommand("select Mark From ContentRank where RankID=@aRankID and ContentID=@aContentID", con);
                    con.Open();
                    cmd.Parameters.AddWithValue("@aRankID", aRankID);
                    cmd.Parameters.AddWithValue("@aContentID", aContentID);
                    cmd.ExecuteNonQuery();
                    xe3.SetAttribute("Score", cmd.ExecuteScalar().ToString());
                    if (xn1.ChildNodes.Count != 0)
                    {
                        bool flag = false;
                        foreach (XmlNode xn2 in xnl2)
                        {
                            XmlElement xe4 = (XmlElement)xn2;
                            string aDescription = xe4.Attributes["Description"].Value;
                            if (aDescription == (aRank + aContent))
                            {
                                //在这里提示｛不能重复添加该项｝
                                flag = true;
                                break;                            }                            //else
                            //{
                            //    ((XmlElement)xn1).AppendChild(xe3);
                            //    TextBox1.Text += (aRank + aContent);
                            //}
                        }
                        if (flag == false)
                        {
                            ((XmlElement)xn1).AppendChild(xe3);
                            TextBox1.Text += (aRank + aContent);
                        }
                    }
                    else
                    {
                        ((XmlElement)xn1).AppendChild(xe3);
                        TextBox1.Text += (aRank + aContent);
                    }
                }
            }
            foreach (XmlNode xn1 in xnl1)
            {
                //定义一个字典类
                IDictionary<string, int> dictionary = new Dictionary<string, int>();
                int avalue = 0;
                XmlElement xe2 = (XmlElement)xn1;
                XmlNodeList xnl2 = xe2.ChildNodes;
                foreach (XmlNode xn2 in xnl2)
                {
                    XmlElement xe3 = (XmlElement)xn2;
                    //int aContentID = Convert.ToInt32(xn2.Attributes["ContentID"].Value);
                    int score = int.Parse(xe3.GetAttribute("Score"));
                    string id = xe3.GetAttribute("ContentID");
                    if (dictionary.ContainsKey(id))
                    {
                        if (dictionary[id] < score)
                        {
                            dictionary[id] = score;
                        }
                    }
                    else
                    {
                        dictionary[id] = score;                    }
                    //avalue += dictionary[id];                    //int score = int.Parse(element.GetAttribute("Score"));
                    //avalue += Convert.ToInt32(xn2.Attributes["Score"].Value);                }
                foreach (string key in dictionary.Keys)
                {
                    avalue += dictionary[key];
                }
                xe2.Attributes["Score"].Value = avalue.ToString();
                allvalue += Convert.ToInt32(xn1.Attributes["Score"].Value);
            }
            xe.Attributes["Score"].Value = allvalue.ToString();
        }        xmlDoc.Save(Server.MapPath("~/XML/NewXML.xml"));
    }

Answer 10

和具体工作流程无关 我这里只是说复制xml文件的方法 应该没有问题的（在我这里运行正常） 
或许是你的xml数据的原因

Answer 11

你的XML文件格式有问题，你确定你那文件能正确打开为XML格式吗？

Answer 12

xml没有问题的，我没有用副本之前一切是正常的，就是添加节点后不能恢复为XML模板