c#中DynamicObject类型的测试

来源：互联网发布：纵横家知大局编辑：程序博客网时间：2024/06/07 19:20

using System;using System.Collections.Generic;using System.Dynamic;public class MyExpandoObject : DynamicObject{    private Dictionary<string, object> _dict = new Dictionary<string, object>();    public override bool TryGetMember(GetMemberBinder binder, out object result)    {        result = null;        if (_dict.ContainsKey(binder.Name.ToUpper()))        {            result = _dict[binder.Name.ToUpper()];            return true;        }        return false;    }    public override bool TrySetMember(SetMemberBinder binder, object value)    {        if (_dict.ContainsKey(binder.Name.ToUpper()))            _dict[binder.Name.ToUpper()] = value;        else            _dict.Add(binder.Name.ToUpper(), value);        return true;    }    public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)    {        result = new Action(() => { });        if (_dict.ContainsKey(binder.Name.ToUpper()))        {            Type dictType = _dict.GetType();            try            {                result = dictType.InvokeMember(                            binder.Name,                            System.Reflection.BindingFlags.InvokeMethod,                            null,                            this,                            args                        );                return true;            }            catch            {                return false;            }        }        return false;    }    //public static void aa(string str)    public void aa(string str)    {        Console.WriteLine("input {0}", str);    }    //public static void bb()    public void bb()    {        Console.WriteLine("i loving coding!!!");    }    public static void ComeFrom(string country)    {        Console.WriteLine("I'm from {0}", country);    }}class TestMyExpandoObject{    class gg : DynamicObject    {        public static void TestComeFrom(string country)        {            Console.WriteLine("I'm from {0}", country);        }        Dictionary<string, object> dictionary = new Dictionary<string, object>();        public override bool TrySetMember(SetMemberBinder binder, object value)        {            dictionary[binder.Name] = value;            return true;        }        public override bool TryGetMember(GetMemberBinder binder, out object result)        {            return dictionary.TryGetValue(binder.Name, out result);        }    }    static void Main()    {        dynamic t = new gg();        t.fn = new Action<string>(s => gg.TestComeFrom(s));        t.fn("t");        Console.WriteLine("========================================");        dynamic vessel = new MyExpandoObject();        vessel.Name = "Little Miss Understood";        vessel.Age = 12;        vessel.KeelLengthInFeet = 32;        vessel.Longitude = 37.55f;        vessel.Latitude = -76.34f;        //vessel.aa("China");        //vessel.bb();        //Console.WriteLine("========================================");        vessel.fn = new Action<string>(s => MyExpandoObject.ComeFrom(s));        vessel.fn("t");        Console.WriteLine("========================================");        //vessel.fb = new Action(MyExpandoObject.bb);        Console.WriteLine("The {0} year old vessel " +                          "named {1} has a keel length of {2} feet " +                          "and is currently located at {3} / {4}.",                          vessel.AGE, vessel.name,                          vessel.keelLengthINfeet,                          vessel.Longitude, vessel.Latitude);        Console.ReadLine();    }}

实际的时候，建议用ConcurrentDictionary替换Dictionary，eg:

class Person : System.Dynamic.DynamicObject        {            //Dictionary<string, object> properties = new Dictionary<string, object>();            ConcurrentDictionary<string, object> properties = new ConcurrentDictionary<string, object>();            public override bool TryGetMember(System.Dynamic.GetMemberBinder binder, out object result)            {                return properties.TryGetValue(binder.Name, out result);            }            public override bool TrySetMember(System.Dynamic.SetMemberBinder binder, object value)            {                properties[binder.Name] = value;                return true;            }            public ConcurrentDictionary<string, object> GetProperties()            {                return properties;            }            public override string ToString()            {                StringBuilder sb = new StringBuilder();                sb.AppendLine("--- Person attributes ---");                foreach (var key in properties.Keys)                {                    //We use the chaining property of the StringBuilder methods                    sb.Append(key).Append(": ").AppendLine(properties[key].ToString());                }                return sb.ToString();            }        }        static void Main(string[] args)        {            dynamic person = new Person();            person.Name = "Florian";            person.Age = 28;            Console.WriteLine(person);            person.Country = "Germany";            Console.WriteLine(person);            Console.ReadKey();        }

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