Call Class Property/Method use Attribute Name

此法底層仍是透過 call Property/Method 方式取得/設定實際資料, 但其加入中間層(封裝)方式進行呼叫, 好處是當 原始 Class Property/Method 變動名稱時, 原始用到的程式可以不用跟著調整
► Class

public class TestModel
{
    public TestModel(int id, string c1)
    {
        this.id = id;
        this.c1 = c1;
    }
    [CodeName("A1")]
    public int id { get; set; }
    [CodeName("A2")]
    public string c1 { get; set; }
    [CodeName("A3")]
    public DateTime? c2 { get; set; }
    //
    public int getId() {
        return id;
    }
    public class CodeNameAttribute : Attribute
    {
        private readonly string name;
        public CodeNameAttribute(string name) { this.name = name; }
        public string Name { get { return name; } }
    }
    public static TOutput Call<TOutput>(object callByAttribute, string name, object[] args)
    {
        PropertyInfo prop = callByAttribute.GetType().GetProperties()
            .Where(p => p.IsDefined(typeof(CodeNameAttribute), false))
            .SingleOrDefault(p => ((CodeNameAttribute)(p.GetCustomAttributes(typeof(CodeNameAttribute), false)).First()).Name == name);
        if (prop != null)
            return (TOutput)callByAttribute.GetType().InvokeMember(prop.Name, BindingFlags.GetProperty, null, callByAttribute, null);
        MethodInfo method = callByAttribute.GetType().GetMethods()
            .Where(p => p.IsDefined(typeof(CodeNameAttribute), false))
            .SingleOrDefault(p => ((CodeNameAttribute)(p.GetCustomAttributes(typeof(CodeNameAttribute), false)).First()).Name == name);
        if (method != null)
            return (TOutput)callByAttribute.GetType().InvokeMember(method.Name, BindingFlags.InvokeMethod, null, callByAttribute, args);
        throw new Exception("method/getter not found");
    }
    public static TOutput Call<TOutput>(object callByAttribute, string name)
    {
        return Call<TOutput>(callByAttribute, name, null);
    }
}

► Call Attribute

Console.WriteLine("CallByAttribute=" + TestModel.Call<String>(i, "A2"));

from http://stackoverflow.com/questions/3706037/calling-a-property-or-method-...