C# 自定义类中括号取值 测试

    public class ABC : Hashtable{}
    static class Program
    {
        public static ABC  a= new ABC();
        static void Main(string[] args)
        {
            var c = a[""]; //自定义类中括号取值
        }
    }

        var t = Request.Form["sets"].ToString();
  public abstract class HttpRequest
    {
        public abstract IFormCollection Form { get; set; }
    }

    public interface IFormCollection : IEnumerable<KeyValuePair<string, StringValues>>, IEnumerable
    {

        StringValues this[string key] { get; }

        int Count { get; }

        ICollection<string> Keys { get; }

        IFormFileCollection Files { get; }

        bool ContainsKey(string key);

        bool TryGetValue(string key, out StringValues value);
}

    class Program
    {
        public static ABC a = new ABC();
        static void Main(string[] args)
        {
            var c = a[""]; //自定义类中括号取值

        }
    }
    class ABC
    {
//new 关键字 可以删
        public new string this[string index] {
            get
            {
                return "";
            }
        }

    }

//继承  可以使用父类属性

  class Program
    {
        static void Main(string[] args)
        {
            var  test = new test_A();
            var a =  test[""];
        }
    }
    class test_A:ABC {}
    class ABC
    {
        public  string this[string index] {
            get
            {
                return "";
            }
        }
    }