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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"; } } }
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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); } } }
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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(); } } }
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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; } }
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大家看到代码简洁了不少,有了以下改进:
1.代码变少了
2.可以控制索引的返回结果了
3.更多的利用了Dictionary自身的特性,如CRUD
4.增加了自定义类型转换方法
总之,这些努力都是为了方便别人使用.
好吧,看看客户端测试吧
测试结果是OK的
好了,这样一个通用的配置管理器完成了, 当然有更多的需求,还可以对其进行扩展。欢迎大家不吝赐教 .
祝大家新年快乐,万事如意! 2015,一起任性!
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