c# - 从 C# 读取 XML 配置数据文件

标签 c# xml

我有一个名为 config.xml 的独立 XML 文件，它与我的应用程序一起使用，该文件基本上包含两个部分:

1) 全局设置 2) 服务器列表，包括设置

基本上，全局设置将包含我的程序将用于每个服务器列表的数据库用户名和数据库密码。

服务器列表条目包含服务器列表以及一些文件名以及数据库用户名和数据库密码。这里唯一重要的是，如果我在服务器列表中指定用户名/密码，那么它将使用它而不是全局数据库用户名和密码。或者，换句话说，如果服务器列表条目中未定义数据库用户名和密码，它将使用全局数据库用户名密码。

我的程序基本上循环遍历 xml 配置文件，并对每个 DB2 服务器执行一些数据库查询，处理信息并创建报告。今天可以使用，但我确实有一些问题......

1) 每次向 XML 配置文件中添加新元素时，都必须为创建的每个节点添加它，否则会出现 XML 解析错误。

2) 我想对我的配置 XML 文件进行分类，而不是将所有内容集中在同一个节点中并包含空元素。

示例 XML 如下:

<?xml version="1.0" encoding="utf-8" ?>
<Config>
    <Global>
    <OutputFolder>C:\DATA\Configs\DB2\</OutputFolder>
    <DBUser>DB2ADMIN</DBUser>
    <DBPassword>%SecretPassword%</DBPassword>
    <FTPFiles>false</FTPFiles>
    <FTPTcpIp>127.0.0.1</FTPTcpIp>
    <FTPUser>FTPLogin1</FTPUser>
    <FTPPassword>P@ssw0rd</FTPPassword>
    <FTPRemoteFolder>/configs</FTPRemoteFolder>
    </Global>
    <Servers>
        <Server enabled="true">
        <Category>Report1</Category>
        <TcpIp>192.168.26.107</TcpIp>
        <Database>SampleData</Database>
        <User></User>
        <Password></Password>
        <Report1FileNameList>List1.txt</Report1FileNameList>
        <Report1FileNameRoutes>Routes1.txt</Report1FileNameRoutes>
        <Report1FileNameRouteTimeouts>Timeouts1.txt</Report1FileNameRouteTimeouts>
        <Report1FileNameEndpoints></Report1FileNameEndpoints>
        <Report2FilenameServers></Report2FilenameServers>
        <Report2FilenameRoutingGroup></Report2FilenameRoutingGroup>
     </Server>
     <Server enabled="true">
         <Category>Report1</Category>
         <TcpIp>192.168.26.107</TcpIp>
         <Database>SampleDataB</Database>
         <User></User>
         <Password></Password>
         <Report1FileNameList>List1.txt</Report1FileNameList>
         <Report1FileNameRoutes>Routes1.txt</Report1FileNameRoutes>
         <Report1FileNameRouteTimeouts>Timeouts1.txt</Report1FileNameRouteTimeouts>
         <Report1FileNameEndpoints></Report1FileNameEndpoints>
         <Report2FilenameServers></Report2FilenameServers>
         <Report2FilenameRoutingGroup></Report2FilenameRoutingGroup>
      </Server>
      <Server enabled="true">
          <Category>Report2</Category>
          <TcpIp>192.168.26.107</TcpIp>
          <Database>SampleDataE</Database>
          <User></User>
          <Password></Password>
          <Report1FileNameList></Report1FileNameList>
          <Report1FileNameRoutes></Report1FileNameRoutes>
          <Report1FileNameRouteTimeouts></Report1FileNameRouteTimeouts>
          <Report1FileNameEndpoints>Endpoints2.txt</Report1FileNameEndpoints>
          <Report2FilenameServers>Servers2.txt</Report2FilenameServers>
          <Report2FilenameRoutingGroup>Groups2.txt</Report2FilenameRoutingGroup>
      </Server>
      <Server enabled="true">
          <Category>Report2</Category>
          <TcpIp>192.168.26.108</TcpIp>
          <Database>SampleDatabase1_D</Database>
          <User></User>
          <Password></Password>
          <Report1FileNameList></Report1FileNameList>
          <Report1FileNameRoutes></Report1FileNameRoutes>
          <Report1FileNameRouteTimeouts></Report1FileNameRouteTimeouts>
          <Report1FileNameEndpoints>Endpoints2.txt</Report1FileNameEndpoints>
          <Report2FilenameServers>Servers2.txt</Report2FilenameServers>
          <Report2FilenameRoutingGroup>Groups1.txt</Report2FilenameRoutingGroup>
       </Server>
    </Servers>

示例代码如下:

        // load XML file
        try
        {
            // Config/Global
            System.Xml.XPath.XPathDocument doc = new System.Xml.XPath.XPathDocument(@"config.xml");

            foreach (System.Xml.XPath.XPathNavigator child in doc.CreateNavigator().Select("Config/Global"))
            {
                xml_global_outputFolder = child.SelectSingleNode("OutputFolder").Value;
                xml_global_DBuser = child.SelectSingleNode("DBUser").Value;
                xml_global_DBpassword = child.SelectSingleNode("DBPassword").Value;
                xml_global_FTPFiles = bool.Parse(child.SelectSingleNode("FTPFiles").Value);
                xml_global_FTPTcpIp = child.SelectSingleNode("FTPTcpIp").Value;
                xml_global_FTPUser = child.SelectSingleNode("FTPUser").Value;
                xml_global_FTPPassword = child.SelectSingleNode("FTPPassword").Value;
                xml_global_FTPRemoteFolder = child.SelectSingleNode("FTPRemoteFolder").Value;
            }

            // Config/Servers
            //System.Xml.XPath.XPathDocument doc = new System.Xml.XPath.XPathDocument(@"config.xml");
            foreach (System.Xml.XPath.XPathNavigator child in doc.CreateNavigator().Select("Config/Servers/*"))
            {

                //string xml_enabled = child.GetAttribute("Enabled", "");
                string xml_category = child.SelectSingleNode("Category").Value;
                string xml_tcpip = child.SelectSingleNode("TcpIp").Value;
                string xml_database = child.SelectSingleNode("Database").Value;
                string xml_user = child.SelectSingleNode("User").Value;
                string xml_password = child.SelectSingleNode("Password").Value;

                Console.WriteLine("Connecting to {0} using database {1} for {2} information...", xml_tcpip, xml_database, xml_category);

                // if node user value is empty, use global
                if (xml_user == string.Empty)
                {
                    DB2_user = xml_global_DBuser;
                }
                else
                {
                    DB2_user = xml_user;
                }

                // if node password value is empty, use global
                if (xml_password == string.Empty)
                {
                    DB2_password = xml_global_DBpassword;
                }
                else
                {
                    DB2_password = xml_password;
                }

                string txtFilename = string.Empty;
                string csvFilename = string.Empty;

                switch (xml_category.ToUpper())
                {
                    case "SAMPLE":
                        txtFilename = Path.Combine(xml_global_outputFolder, @"EMPLOYEE.csv");
                        csvFilename = Path.Combine(xml_global_outputFolder, Path.GetFileNameWithoutExtension(@"EMPLOYEE.csv"));
                        ExecuteQuery(xml_category, "SAMPLE", xml_tcpip, DB2_user, DB2_password, xml_database, csvFilename, txtFilename, option_debug);
                        break;
                }
                Console.WriteLine("");

            }
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception: {0}", e.Message);
            Environment.Exit(1);
        }

        Environment.Exit(0);
    }

我想理想情况下，我想创建特定于节点的配置，如果元素为空，则代码应该能够处理丢失的元素或空元素。也许可以使用类别的属性来代替？像这样的东西:

   <Config>
  <Global>
     <OutputFolder></OutputFolder>
     <DBUser></DBUser>
     <DBPassword><DBPassword>
  </Global>
  <Servers category="Report1">
     <Server>
        <TcpIP>whatever</TcpIP>
        <User>whatever></User>
        <Password>whatever></Password>
     </Server>
     <Server>
        <TcpIP>whatever</TcpIP>
        <User>whatever></User>
        <Password>whatever></Password>
     </Server>
     <Server>
        <TcpIP>whatever</TcpIP>
        <User>whatever></User>
        <Password>whatever></Password>
     </Server>
 </Server>
  <Servers category="Report2">
     <Server>
        <TcpIP>whatever</TcpIP>
        <User>whatever></User>
        <Password>whatever></Password>
     </Server>
     <Server>
        <TcpIP>whatever</TcpIP>
        <User>whatever></User>
        <Password>whatever></Password>
     </Server>
     <Server>
        <TcpIP>whatever</TcpIP>
        <User>whatever></User>
        <Password>whatever></Password>
     </Server>
 </Server>
  <Servers category="AccessList">
     <Server>
        <TcpIP>whatever</TcpIP>
        <Database>whatever></Database>
        <Active>whatever</Active>
     </Server>
     <Server>
        <TcpIP>whatever</TcpIP>
        <Database>whatever></Database>
        <Active>whatever</Active>
     </Server>
     <Server>
        <TcpIP>whatever</TcpIP>
        <Database>whatever></Database>
        <Active>whatever</Active>
     </Server>
 </Server>
</Config>

最佳答案

您需要做的是创建一组类，每个类代表每组节点。如果您想使用these extensions ，他们将帮助您处理空节点和默认值:

在全局中读取和写入OutputFolder:

DirectoryInfo outputFolder = ConfigFile.Read.Global.OutputFolder;
ConfigFile.Write(file => file.Global.OutputFolder = outputFolder);

类(class):

public class ConfigFile : IDisposable
{
    internal XElement self;
    string file = "path to a file";

    public ConfigFile()
    {
        if(File.Exists(file))
            self = XElement.Load(file);
        else
            self = new XElement("Config");
    }

    public void Dispose() { self.Save(file); }

    public static ConfigFile Read { get { return new ConfigFile(); } }

    public static void Write(Action<ConfigFile> action)
    {
        using(ConfigFile file = new ConfigFile())
            action(file);
    }

    public Global Global
    { get { return _Global ?? (_Global = new Global(self.GetElement("Global"))); } }
    Global _Global;

    public Servers Servers
    { get { return _Servers ?? (_Servers = new Servers(self.GetElement("Servers"))); } }
    Servers _Servers

    public class Global
    {
        internal XElement self;
        public Global(XElement self) { this.self = self; }

        public DirectoryInfo OutputFolder
        {
            get { return self.Get<DirectoryInfo>("OutputFolder", null); }
            set { self.Set("OutputFolder", value, false); }
        }
    }

    public class Servers
    {
        internal XElement self;
        public Servers(XElement self) { this.self = self; }

        public void Add(Server server)
        {
            self.Add(server.self);
        }

        public string Category
        {
            get { return self.Get("category", string.Empty); }
            set { self.Set("category", value, true); }
        }

        public Server[] Items
        { get { return self.GetEnumerable("Server", x => new Server(x)).ToArray(); } }

        public class Server
        {
            internal XElement self;

            public Server() { self = new XElement("Server"); }

            public Server(XElement self) { this.self = self; }

            public bool Active
            {
                get { return self.Get("Active", false); }
                set { self.Set("Active", value, true); }
            }
        }
    }
}

GetElement() 优于 Element()，因为它可以处理元素节点不存在的情况。 Get() 采用默认值，因此它始终有一个值。

一旦有了类区分，向文件添加新值就更简单了，因为您可以简单地将另一个属性写入类，并让它在不存在时返回默认值。

关于c# - 从 C# 读取 XML 配置数据文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10323352/

上一篇：c# - InsertFile 的 OpenXML SDK 替代方案是什么？

下一篇：c# - 将值从表单传递到文本框

相关文章：

c# - C# 中的 ComImport，如何找到 shell32.dll 中 IFileDialog 等类的 GUID？

c# - 从 HTML 节点读取值

c++ - 通过属性搜索和提取XML节点

java - 如何从相应的 xsd'S 获取自己的 xml 编辑器的信息？

java - ant "customization is not associated with any schema element"的 xjc 错误

c# - WPF MVVM : Set focus to current selected item in Datagrid on button click

c# - 声明二维数组的问题

c# - 在C#中产生两个列表项的集合差异

xml - Grails 渲染 XML 从同一个 Controller 调用另一个操作

javascript - 如何使用 ExtJs 将 javascript 数据对象(或模型)转换(或序列化)为 xml

©2024 IT工具网  联系我们