C# Advanced Programming Kapitel 12 Dynamische Spracherweiterung

dynamic person = "人";string firstName = person.FirstName;

class Program
{
    static void Main(string[] args)
    {
        Func<string, string, string> getFullName = (f, l) => { return f + " " + l; };
        dynamic byexobj = new ExpandoObject();
        byexobj.FirstName = "李";
        byexobj.LastName = "四";
        byexobj.GetFullName = getFullName;
        Console.WriteLine(byexobj.GetType());
        Console.WriteLine(byexobj.GetFullName(byexobj.FirstName, byexobj.LastName));
        Console.WriteLine("=====================");
        dynamic dyobj = new MyDynamicObject();
        dyobj.FirstName = "张";
        dyobj.LastName = "三";
        dyobj.GetFullName = getFullName;
        Console.WriteLine(dyobj.GetType());
        Console.WriteLine(dyobj.GetFullName(dyobj.FirstName, dyobj.LastName));
        Console.ReadKey();
    }
}

public class MyDynamicObject : DynamicObject
{
    Dictionary<string, object> dynamicData = new Dictionary<string, object>();
    public override bool TrySetMember(SetMemberBinder binder, object value)
    {
        dynamicData[binder.Name] = value;
        return true;
    }
    public override bool TryGetMember(GetMemberBinder binder, out object result)
    {
        bool success = false;
        result = null;
        if (dynamicData.ContainsKey(binder.Name))
        {
            result = dynamicData[binder.Name];
            success = true;
        }
        else
        {
            result = "未找到该属性的值";
            success = false;
        }
        return success;
    }
    public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
    {
        dynamic method = dynamicData[binder.Name];
        result = method((string)args[0],(string)args[1]);
        return result != null;
    }
}