C#讀寫取配置文件XML、Properties

我們在部署消息中間件的時候，可能需要對配置文件進行一些修改，正常情況下我們會直接到config路徑下手動修改，但是這種做法並不適用於一鍵安裝部署服務。所以我們需要實現一個接口供運營人員方便操作、修改配置信息。我實現了兩個版本的修改配置文件的接口（Java和C#），這裏先分享C#版的實現代碼。 

1. 配置修改XML（ActiveMQ的通信端口和服務器控制檯端口）

  public class ReadAndWriteXML
    {
        #region 屬性
        /// <summary>
        /// 存放xml內容的文件夾下的文件名
        /// </summary>
        private string JettyXML = "jetty.xml";
        private string ActiveMQXML = "activemq.xml";

        #endregion

        #region 寫入xml
        /// <summary>
        ///
        /// </summary>
        /// <param name="file">文件名</param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public int WriteDoc(string path, string file, string value)
        {
            string SavePath = Path.Combine(path, "config");

            //判斷是否存在文件夾
            var DirectoryPath = Path.GetDirectoryName(SavePath);  //獲取文件夾所在的路徑
            if (!Directory.Exists(SavePath))
            {
                return 3;  //文件夾不存在返回3
            }
            XmlDocument doc = new XmlDocument();
            try
            {
                if (File.Exists(Path.Combine(SavePath, file)))
                {
                    //如果文件存在 加載XML
                    doc.Load(Path.Combine(SavePath, file));
                    //分支判斷是jetty還是activemq
                    if (file.Equals(JettyXML))
                    {
                        XmlNode xmlnode = doc.SelectSingleNode(@"//bean[@id='jettyPort']");
                        xmlnode.LastChild.Attributes["value"].Value = value;
                    }
                    if (file.Equals("ActiveMQXML"))
                    {
                        XmlNode xmlnode = doc.SelectSingleNode("/beans/broker/transportConnectors/transportConnector[@name='openwire']");
                        xmlnode.Attributes["uri"].Value = "tcp://0.0.0.0:" + value + "?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600";
                    }

                    doc.Save(file);
                }
                return 0;
            }
            catch (Exception e)
            {
                return 10;
            }
        }
}

2. 配置修改properties文件（ActiveMQ的管理員信息）

/// <summary>
///ReadProperties 的摘要說明
/// </summary>
public class ReadProperties : System.Collections.Hashtable
{
    private ArrayList list = new ArrayList();
    public ArrayList List
    {
        get { return list; }
        set { list = value; }
    }
    /// <summary>
    /// 構造函數
    /// </summary>
    /// <param name="fileName">要讀寫的properties文件名</param>
    public ReadProperties(string path)
    {
        string filepath = Path.Combine(path, "config/users.properties");
        Load(filepath);
    }
    /// <summary>
    /// 重寫父類的方法,key值相當於用戶ID，Value值相當於Password
    /// </summary>
    /// <param name="key">鍵</param>
    /// <param name="value">值</param>
    public override void Add(object key, object value)
    {
        base.Add(key, value);
        list.Add(key);
    }
    public override ICollection Keys
    {
        get
        {
            return list;
        }
    }
    /// <summary>
    /// 加載文件
    /// </summary>
    /// <param name="filePath">文件路徑</param>
    public void Load(string filePath)
    {
        char[] convertBuf = new char[1024];
        int limit;
        int keyLen;
        int valueStart;
        char c;
        string bufLine = string.Empty;
        bool hasSep;
        bool precedingBackslash;
        using (StreamReader sr = new StreamReader(filePath))
        {
            while (sr.Peek() >= 0)
            {
                bufLine = sr.ReadLine();
                limit = bufLine.Length;
                keyLen = 0;
                valueStart = limit;
                hasSep = false;
                precedingBackslash = false;
                if (bufLine.StartsWith("#"))
                    keyLen = bufLine.Length;
                while (keyLen < limit)
                {
                    c = bufLine[keyLen];
                    if ((c == '=' || c == ':') & !precedingBackslash)
                    {
                        valueStart = keyLen + 1;
                        hasSep = true;
                        break;
                    }
                    else if ((c == ' ' || c == '\t' || c == '\f') & !precedingBackslash)
                    {
                        valueStart = keyLen + 1;
                        break;
                    }
                    if (c == '\\')
                    {
                        precedingBackslash = !precedingBackslash;
                    }
                    else
                    {
                        precedingBackslash = false;
                    }
                    keyLen++;
                }
                while (valueStart < limit)
                {
                    c = bufLine[valueStart];
                    if (c != ' ' && c != '\t' && c != '\f')
                    {
                        if (!hasSep && (c == '=' || c == ':'))
                        {
                            hasSep = true;
                        }
                        else
                        {
                            break;
                        }
                    }
                    valueStart++;
                }
                string key = bufLine.Substring(0, keyLen);
                string values = bufLine.Substring(valueStart, limit - valueStart);
                if (key == "")
                    key += "#";
                while (key.StartsWith("#") & this.Contains(key))
                {
                    key += "#";
                }
                this.Add(key, values);
            }
        }
    }
    /// <summary>
    /// 保存文件
    /// </summary>
    /// <param name="filePath">要保存的文件的路徑</param>
    public void save(string filePath)
    {
        if (File.Exists(filePath))
        {
            File.Delete(filePath);
        }
        FileStream fileStream = File.Create(filePath);
        StreamWriter sw = new StreamWriter(fileStream);
        foreach (object item in list)
        {
            String key = (String)item;
            String val = (String)this[key];
            if (key.StartsWith("#"))
            {
                if (val == "")
                {
                    sw.WriteLine(key);
                }
                else
                {
                    sw.WriteLine(val);
                }
            }
            else
            {
                sw.WriteLine(key + "=" + val);
            }
        }
        sw.Close();
        fileStream.Close();
    }
}

調用的時候我們先調用構造方法實例化，然後調用Add方法即可。