通过字符串标识符获取 list<T> 的值

Question

我想通过仅用字符串标识对象来获取 List 中项目的值string A ="some_string";              listobject.Add(fruit[0].A);public class apple    {        public string labbnummer { get; set; }        public string red { get; set; }        public string gren { get; set; }        public string blue { get; set; }        public string purple { get; set; }}public List<apple> fruit = new List<apple>();public List<apple> rutten_fruit = new List<apple>();List<string> myfruitlist = new List<string>();myfruitlist.Add("green");  myfruitlist.Add("red"); public void populate{ while (reader.Read())                {                    apple tasty = new apple();                    tasty.green = (string)reader["green"];                    tasty.red = (string)reader["red"];            if (list_nr == 0) { fruit.Add(tasty); }}public void orange(){  foreach (var items in myfruitlist)            {               var A =items;                             rutten_fruit.Add(fruit[0].A.ToString());                    }}它不接受 listobject.Add(fruit[0].A); A 作为标识符

Answer 1

从技术上讲，您可以尝试使用Reflection ie按名称查找属性：

using System.Reflection;

...

private static T PropertyReader<T>(object value, string name) {

  if (null == value)

    throw new ArgumentNullException(nameof(value));

  else if (null == name)

    throw new ArgumentNullException(nameof(name));

  var prop = value.GetType().GetProperty(name);

  if (null == prop || !prop.CanRead)

    throw new ArgumentException($"property {name} has not been found.", nameof(name));

  return (T)(Convert.ChangeType(prop.GetValue(value, new object[0]), typeof(T)));

}

然后你可以按如下方式使用它：

listobject.Add(PropertyReader<string>(fruit[0], A));