代碼如下：

1.?

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;namespace ConfigurationLibrary {public class ConfigElement{public int Id { get; set; }public string Value { get; set; }} }

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2.

using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Linq; using System.Text; using System.Threading.Tasks;namespace ConfigurationLibrary {public class ConfigurationContainer{private ReadOnlyDictionary<string, ConfigElement> _configuration;private Dictionary<string, ConfigElement> _mutableConfiguration;public ReadOnlyDictionary<string, ConfigElement> Configuration{get{_configuration =new ReadOnlyDictionary<string, ConfigElement>(_mutableConfiguration);return _configuration;}}public ConfigurationContainer(){_mutableConfiguration = new Dictionary<string, ConfigElement>();_mutableConfiguration.Add("key", new ConfigElement { Id=1, Value="value1"});_mutableConfiguration.Add("key1", new ConfigElement { Id = 1, Value = "value1" });_mutableConfiguration["key2"] = new ConfigElement { Id = 1, Value = "value1" };}public bool AddToConfiguration(string key, ConfigElement value){if (ConfigurationAllowed(key, value)){_mutableConfiguration.Add(key, value);return true;}return false;}private bool ConfigurationAllowed(string key, ConfigElement value){// Put in your checks and balances// here and return the appropriate resultreturn true;}} }

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3.

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using ConfigurationLibrary;namespace ConfigurationUser {public class ConfigurationConsumer{IReadOnlyDictionary<string, ConfigurationLibrary.ConfigElement> _config;public ConfigurationConsumer(){_config = new ConfigurationLibrary.ConfigurationContainer().Configuration;}public void DoSomething(){if (_config.ContainsKey("key")){// Do Something Console.WriteLine(string.Format("Did Something, Got - {0}",_config["key"].Value));}else{// Do Something Else.Console.WriteLine("Did Something Else");}}public void BeNaughtyWithConfiguration(){IDictionary<string, ConfigElement> convertToReadWrite= (IDictionary<string, ConfigElement>)_config;ConfigElement element = convertToReadWrite["key"];element.Value = "Haa Haa";Console.WriteLine(element.Value);Console.WriteLine(convertToReadWrite["key"].Value);Console.ReadLine();// 上面的代碼都能運行通過，下面這行代碼將拋出異常。convertToReadWrite.Add("Key12345", new ConfigElement { Id = 100, Value = "Haa Haa" });}} }

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4.

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;namespace ReadOnlyCollectionSample {class Program{static void Main(string[] args){ConfigurationUser.ConfigurationConsumer consumer =new ConfigurationUser.ConfigurationConsumer();consumer.DoSomething();Console.ReadLine();consumer.BeNaughtyWithConfiguration();}} }

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謝謝瀏覽！

轉載于:https://www.cnblogs.com/Music/p/readonly-collection-in-dotnet4_5.html

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