Question

我正在尝试将一些数据写入XML文件。实际上，我可以这样做，但在每次运行中，XML文件都会被覆盖，而我希望它添加另一行。这是我到目前为止所做的：

  public static void StoreCustomerIntoXML(string Id)
    {

        string pth = System.Reflection.Assembly.GetCallingAssembly().CodeBase;
        string actualPath = pth.Substring(0, pth.LastIndexOf("bin"));
        string projectPath = new Uri(actualPath).LocalPath;
        string reportPath = projectPath + "Customers\\CustomersListCreated.xml";


        XmlDocument xmlDoc = new XmlDocument();
        XmlNode rootNode = xmlDoc.CreateElement("Customers");
        xmlDoc.AppendChild(rootNode);

        XmlNode userNode = xmlDoc.CreateElement("Id");
        userNode.InnerText = Id;
        rootNode.AppendChild(userNode);

       xmlDoc.Save(reportPath);

    }

因此，首次调用该方法将包括Id = 1234 第二轮将包括Id = 6543 XML文件将始终包含上次运行的ID，仅包含此Id。

Answer 1

试试这个

public static void StoreCustomerIntoXML(string Id)
    {

        string pth = System.Reflection.Assembly.GetCallingAssembly().CodeBase;
        string actualPath = pth.Substring(0, pth.LastIndexOf("bin"));
        string projectPath = new Uri(actualPath).LocalPath;
        string reportPath = projectPath + "CustomersListCreated.xml";

        XmlDocument xmlDoc = new XmlDocument();
        if (File.Exists(reportPath))
        {
            xmlDoc.Load(reportPath);
            XmlNode rootNode = xmlDoc.DocumentElement;
            xmlDoc.AppendChild(rootNode);
            XmlElement elem = xmlDoc.CreateElement("Id");
            elem.InnerText = Id;
            rootNode.AppendChild(elem);
        }
        else
        {                
            XmlNode rootNode = xmlDoc.CreateElement("Customers");
            xmlDoc.AppendChild(rootNode);
            XmlNode userNode = xmlDoc.CreateElement("Id");
            userNode.InnerText = Id;
            rootNode.AppendChild(userNode);
        }   
        xmlDoc.Save(reportPath);
    }

Answer 2

您可以检查文件是否存在并使用方法Load加载它，而不是每次调用方法时都创建一个新文件。

public static void StoreCustomerIntoXML(string Id)
{    
        string pth = System.Reflection.Assembly.GetCallingAssembly().CodeBase;
        string actualPath = pth.Substring(0, pth.LastIndexOf("bin"));
        string projectPath = new Uri(actualPath).LocalPath;
        string reportPath = projectPath + "Customers\\CustomersListCreated.xml";


        XmlDocument xmlDoc;
        if (File.Exists(reportPath))             
             xmlDoc = XDocument.Load(reportPath); 
        else
             xmlDoc = new XmlDocument();
        XmlNode rootNode = xmlDoc.CreateElement("Customers");
        xmlDoc.AppendChild(rootNode);

        XmlNode userNode = xmlDoc.CreateElement("Id");
        userNode.InnerText = Id;
        rootNode.AppendChild(userNode);

       xmlDoc.Save(reportPath);

}

Answer 3

 public static void StoreCustomerIntoXML(string Id)
 { 
     string pth = System.Reflection.Assembly.GetCallingAssembly().CodeBase;
     string actualPath = pth.Substring(0, pth.LastIndexOf("bin"));
     string projectPath = new Uri(actualPath).LocalPath;
     string reportPath = projectPath + "Customers\\CustomersListCreated.xml";

     XmlDocument xmlDoc = new XmlDocument();
     XmlNode rootNode;

     if (File.Exists(reportPath)) 
     {
         xmlDoc.Load(reportPath);
         rootNode = xmlDoc.DocumentElement;
     }
     else
     {
         rootNode = xmlDoc.CreateElement("Customers");
         xmlDoc.AppendChild(rootNode);
     }


     XmlNode userNode = xmlDoc.CreateElement("Id");
     userNode.InnerText = Id;
     rootNode.AppendChild(userNode);

     xmlDoc.Save(reportPath);

 }

每次运行都会覆盖XML文件

3 个答案: