一个简单的配置管理器(SettingManager)

在很多.net开发的项目中，我们几乎都会使用到一些自定义的参数，比如说第三方的配置参数之类的.

他们的特点是:1.系统全局 2,可以做成键值对(Dictionary).

我们可以将这些参数放到Web.config,xml或者数据库表中,当然部分不常变的可以直接写在程序中.

为了方便我通常喜欢将他们统放在一个配置管理器中,然后希望别人使用时, 可以像使用AppSetings中的参数一样

初看起来还是比较容易实现，在ConfiguratonManager中定义一个公开属性AppSettings就好了.

实现如下:

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConfigManager
{
    public class ConfigurationContainer
    {
        private static ConfigurationContainer m_Instance = null;

        public static ConfigurationContainer Instance
        {
            get
            {
                if (m_Instance == null)
                    m_Instance = new ConfigurationContainer();
                return m_Instance;
            }
        }

        private ConfigurationContainer()
        {

        }

        private ReadOnlyDictionary<string, string> _configuration;
        private Dictionary<string, string> _mutableConfiguration;

        public ReadOnlyDictionary<string, string> Configuration
        {
            get
            {
                //TODO:check is newest or not in database??
                if (_mutableConfiguration == null)
                    Init();

                _configuration =
                    new ReadOnlyDictionary<string, string>(_mutableConfiguration);
                return _configuration;
            }
        }

        public bool Add(string key, string value)
        {
            bool bRet = false;
            if (!_mutableConfiguration.ContainsKey(key))
            {
                _mutableConfiguration.Add(key, value);
                bRet = true;
            }
            return bRet;
        }

        public bool Update(string key, string value)
        {
            bool bRet = false;
            if (_mutableConfiguration.ContainsKey(key))
            {
                _mutableConfiguration[key] = value;
                bRet = true;
            }
            return bRet;
        }

        public bool Remove(string key)
        {
            bool bRet = false;
            if (_mutableConfiguration.ContainsKey(key))
            {
                _mutableConfiguration.Remove(key);
                bRet = true;
            }
            return bRet;
        }

        //private bool ConfigurationAllowed(string key, string value)
        //{
        //    // Put in your checks and balances
        //    // here and return the appropriate result
        //    return true;
        //}

        private void Init()
        {
            _mutableConfiguration = new Dictionary<string, string>();
            _mutableConfiguration.Add("key", "value");
            _mutableConfiguration.Add("key1", "value1");
            _mutableConfiguration["key2"] = "value2";
        }
    }
}

View Code

ConfigurationContainer:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConfigManager
{
    public class ConfigManager
    {
        private static IReadOnlyDictionary<string, string> _AppSettings = null;
        public static IReadOnlyDictionary<string, string> Appettings
        {
            get
            {
                //initial ensurer the newest
                _AppSettings = ConfigurationContainer.Instance.Configuration;
                return _AppSettings;
            }
        }

        //Exception:Violence to  Add
        public static void BeNaughtyWithConfiguration()
        {
            IDictionary<string, string> convertToReadWrite
                = (IDictionary<string, string>)_AppSettings;
            //ConfigElement element = convertToReadWrite["key"];
            //element.Value = "Haa Haa";
            //Console.WriteLine(element.Value);
            //Console.WriteLine(convertToReadWrite["key"]);
            //Console.ReadLine();

            convertToReadWrite.Add("Key12345", "xsds");
        }

        public static bool Add(string key, string value)
        {
            return ConfigurationContainer.Instance.Add(key, value);
        }

        public static bool Update(string key, string value)
        {
            return ConfigurationContainer.Instance.Update(key, value);
        }

        public static bool Remove(string key)
        {
            return ConfigurationContainer.Instance.Remove(key);
        }
    }
}

View Code

最底层是一个单例模式,并封装了字典的CRUD操作。

客户端测试一下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConfigManager
{
    class Program
    {
        static void Main(string[] args)
        {
            var settings = ConfigManager.Appettings;
            
            foreach(var item in settings)
            {
                Console.WriteLine("key:{0},value:{1}",item.Key,item.Value);
            }

            var t1 = ConfigManager.Appettings["key1"];

            //test add
            ConfigManager.Add("t","test");
            //var t2 = ConfigManager.Appettings;
            //update
            ConfigManager.Update("t","test123");

            //remove
            ConfigManager.Remove("t");

            Console.ReadKey();
        }
    }
}

View Code

好像也能运行。

那么，问题来了!测试代码改一改,

//test not item in Dictionary
 var t2 = ConfigManager.Appettings["luckyhu"];

代码崩溃了，老兄!

其实上面的代码能够满足一般的需求，但是对使用着来说，仍然不太方便.所以我和同事进一步优化了上述代码.

现在变得更加简洁了.

public class SettingManager : Dictionary<string, string>
    {
        private static SettingManager _Settings = null;
        public static SettingManager Settings
        {
            get
            {
                if (_Settings == null)
                    _Settings = new SettingManager();
                return _Settings;
            }
        }

        private SettingManager()
        {
            //Init Data
            //DataSoure:truely data here...
            for (int i = 0; i < 10; i++)
            {
                var key = String.Format("key{0}", i);
                var value = String.Format("value{0}", i);
                if (!this.Keys.Contains(key))
                    this.Add(key, value);
            }
        }

        public string this[string key]
        {
            get
            {
                if (!this.ContainsKey(key))
                    return String.Empty;
                return base[key];
            }
            set
            {
                base[key] = value;
            }
        }

        public static bool GetBoolValue(string key)
        {
            bool value = false;
            bool.TryParse(Settings[key], out value);
            return value;
        }

        public static int GetIntValue(string key)
        {
            int value = 0;
            int.TryParse(Settings[key], out value);
            return value;
        }
    }