C# リフレクションまとめ4 (メンバを実行する)

ConstructorInfoを実行して、型のインスタンスを生成する

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace ReflectionTest
{
    class ClassA
    {
        public ClassA()
        {
            Console.WriteLine("Constructor is called.");
        }

        public void Method()
        {
            Console.WriteLine("Method is called.");
        }

        private Int32 i = 0;
        public Int32 Property
        {
            get { return i; }
            set { i = value; }
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            Type t = typeof(ClassA);
            ConstructorInfo ci = t.GetConstructor(new Type[0]);
            ClassA ca = (ClassA)ci.Invoke(new Object[0]);
            ca.Method();
        }
    }
}

---

MethodInfoを実行して、型のメソッドを呼び出す

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace ReflectionTest
{
    class ClassA
    {
        public ClassA()
        {
            Console.WriteLine("Constructor is called.");
        }

        public void Method()
        {
            Console.WriteLine("Method is called.");
        }

        private Int32 i = 0;
        public Int32 Property
        {
            get { return i; }
            set { i = value; }
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            Type t = typeof(ClassA);
            Object o = Activator.CreateInstance(t);
            MethodInfo mi = t.GetMethod("Method");
            mi.Invoke(o, null);
        }
    }
}

---

PropertyInfoを実行して、getアクセサ、setアクセサを呼び出す

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace ReflectionTest
{
    class ClassA
    {
        public ClassA()
        {
            Console.WriteLine("Constructor is called.");
        }

        public void Method()
        {
            Console.WriteLine("Method is called.");
        }

        private Int32 i = 0;
        public Int32 Property
        {
            get { return i; }
            set { i = value; }
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            Type t = typeof(ClassA);
            Object o = Activator.CreateInstance(t);
            PropertyInfo pi = t.GetProperty("Property");

            //Set
            MethodInfo setMethod = pi.GetSetMethod();
            setMethod.Invoke(o, new Object[1] { 100 });
            Console.WriteLine(((ClassA)o).Property);

            //Get
            MethodInfo getMethod = pi.GetGetMethod();
            Int32 ret = (Int32)getMethod.Invoke(o, null);
            Console.WriteLine(ret);
        }
    }
}

---

publicなフィールドの値を設定、取得する

FieldInfoのGetValue、SetValueを使う。

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace ReflectionTest
{
    class ClassA
    {
        public ClassA()
        {
            Console.WriteLine("Constructor is called.");
        }

        public void Method()
        {
            Console.WriteLine("Method is called.");
        }

        private Int32 i = 0;
        public Int32 Property
        {
            get { return i; }
            set { i = value; }
        }
        public String s = null;
    }


    class Program
    {
        static void Main(string[] args)
        {
            Type t = typeof(ClassA);
            Object o = Activator.CreateInstance(t);
            FieldInfo fi = t.GetField("s");
            
            fi.SetValue(o, "Reflection");
            ClassA ca = (ClassA)o;
            Console.WriteLine(ca.s);

            String s = (String)fi.GetValue(o);
            Console.WriteLine(s);
        }
    }
}