C#中GetType().GetField() 未将对象引用设置到对象的实例

Question

问题遇到的现象和发生背景

GetType().GetField()运行时提示"未将对象引用设置到对象的实例"
GetType().GetField("Comp1") 监视窗口显示是空值

问题相关代码，请勿粘贴截图

        double Comp1 = 10; double Comp2 = 30; double Comp3 = 100;

        for (int i = 0; i < 3; i++)
        {
            double val = (double)this.GetType().GetField("Comp" + (i + 1).ToString()).GetValue(this);
        }

Answer 1

GetField加上BindingFlags，没传递测试了下私有的属性获取不到。示例代码如下

using System;
using System.Reflection;
namespace ConsoleApp2
{
    class A
    {
        double Comp1 = 10;
        double Comp2 = 30;
        double Comp3 = 100;
        public void GetValue()
        {

            for (int i = 0; i < 3; i++)
            {
                double val = (double)this.GetType().GetField("Comp" + (i + 1).ToString(), BindingFlags.NonPublic | BindingFlags.Instance).GetValue(this);
                Console.WriteLine(val);
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var a = new A { };
            a.GetValue();

            Console.ReadKey();
        }
    }
}