[C#] ExpandoObject

同事介紹 ExpandoObject 認識，就 MSDN 文章 - ExpandoObject Class，簡易記錄一下

MSDN 說明

The ExpandoObject class enables you to add and delete members of its instances at run time and also to set and get values of these members. This class supports dynamic binding, which enables you to use standard syntax like sampleObject.sampleMember instead of more complex syntax like sampleObject.GetAttribute("sampleMember")

C# Code

using System.Dynamic;
using System.ComponentModel;

namespace Basic
{
    class Program
    {
        static void Main(string[] args)
        {
            dynamic sampleObject = new ExpandoObject();

            // 動態新增 Property
            sampleObject.Property = "Dynamic Property";
            Console.WriteLine("----- 動態新增 Property -----");
            Console.WriteLine($"Type：{sampleObject.Property.GetType()} - Property Value：{sampleObject.Property}");

            // 動態新增 Method
            sampleObject.number = 10;
            sampleObject.Increment = (Action)(() => { sampleObject.number++; });

            Console.WriteLine("----- 動態新增 Method -----");
            Console.WriteLine($"原值：{sampleObject.number}");
            sampleObject.Increment();
            Console.WriteLine($"增值：{sampleObject.number}");

            // 動態新增 Event
            sampleObject.sampleEvent = null;
            Console.WriteLine("----- 動態新增 Event -----");
            sampleObject.sampleEvent += new Action<object, EventArgs>((sender, e) =>
            {
                Console.WriteLine($"SampleHandler for {sender} event");
            });
            sampleObject.sampleEvent(sampleObject, new EventArgs());

            // 參數傳遞
            dynamic employee, manager;

            employee = new ExpandoObject();
            employee.Name = "John Smith";
            employee.Age = 33;

            manager = new ExpandoObject();
            manager.Name = "Allison Brown";
            manager.Age = 42;
            manager.TeamSize = 10;

            WritePerson(manager);
            WritePerson(employee);

            // 移除 Name Property
            ((IDictionary<String, Object>)employee).Remove("Name");
            Console.WriteLine("----- 移除 Name Property -----");
            foreach (var property in (IDictionary<String, Object>)employee)
            {
                Console.WriteLine($"{property.Key} : {property.Value}");
            }

            // PropertyChanged Event
            ((INotifyPropertyChanged)employee).PropertyChanged += ((sender, e) =>
            {
                Console.WriteLine($"{e.PropertyName} has changed.");
            });
            Console.WriteLine("----- PropertyChanged Event -----");
            employee.Name = "John Smith";
        }

        static void WritePerson(dynamic person)
        {
            try
            {
                Console.WriteLine($"{person.Name} is {person.Age} years old in Team {person.TeamSize}.");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"{person.Name}：{ex.Message}");
            }
        }
    }
}

參考資料
• [.NET] 動態語言能力：自製 dynamic 物件 (1): ExpandoObject 物件
• 既然要動態就動個痛快 - ExpandoObject
• [C#]簡介ExpandoObject
• C# 如何動態生成dynamic物件-ExpandoObject