ConcurrentDictionary的ToDictionary

如果Value是引用，那么在使用Value.Clear()的时候。会清空Value的所有元素，但是不会改变Value的引用

 private static void Main(){try{var concurrentDictionary = new ConcurrentDictionary<string, List<int>>();concurrentDictionary.TryAdd("chuck", new List<int>() {1, 2, 3});concurrentDictionary.TryAdd("lihu", new List<int>() {4, 5, 6});var dictionary = concurrentDictionary.ToDictionary(x => x.Key, x => x.Value);foreach (var list in concurrentDictionary.Values){list.Clear();}foreach (var name in dictionary.Keys){Console.WriteLine(name);var list = dictionary[name];foreach (var number in list){Console.Write("\t{0}",number);}Console.WriteLine();}}catch (Exception ex){while (ex != null){Console.WriteLine(ex.Message);ex = ex.InnerException;}}Console.ReadLine();}

还需要测试下Value是List<Student>的情况 

 

 

internal class Student{internal int Id { get; set; }internal string Name { get; set; }}internal class Program{private static void Main(){try{var concurrentDictionary = new ConcurrentDictionary<string, Student>();concurrentDictionary.TryAdd("chuck", new Student() {Id = 1, Name = "chuck"});concurrentDictionary.TryAdd("lihu", new Student() {Id = 2, Name = "lihu"});var dictionary = concurrentDictionary.ToDictionary(x => x.Key, x => x.Value);foreach (var key in concurrentDictionary.Keys){concurrentDictionary[key].Id = 0;concurrentDictionary[key].Name = "hello world";}foreach (var name in dictionary.Keys){Console.Write(name);Console.Write("\tid={0}\tname={1}", dictionary[name].Id, dictionary[name].Name);Console.WriteLine();}}catch (Exception ex){while (ex != null){Console.WriteLine(ex.Message);ex = ex.InnerException;}}Console.ReadLine();}}

 

 

 

 

 

 Value是值类型的

 private static void Main(){try{var concurrentDictionary = new ConcurrentDictionary<string, int>();concurrentDictionary.TryAdd("chuck", 1);concurrentDictionary.TryAdd("lihu",4);var dictionary = concurrentDictionary.ToDictionary(x => x.Key, x => x.Value);foreach (var key in concurrentDictionary.Keys){concurrentDictionary[key] = 0;}foreach (var name in dictionary.Keys){Console.Write(name);Console.Write("\t{0}", dictionary[name]);Console.WriteLine();}}catch (Exception ex){while (ex != null){Console.WriteLine(ex.Message);ex = ex.InnerException;}}Console.ReadLine();}