将元组初始化为空元组 -

Tuple<string, string> myTuple;

如果您想检查元组中的值，即它是否为 null -

示例

using System;

namespace Demo {
   class Program {
      static void Main(string[] args) {
         Tuple <int, string> tuple = new Tuple<int, string>(10, null);

         if (tuple.Item1 == 10) {
            Console.WriteLine(tuple.Item1);
         }

         if (tuple.Item2 == null) {
            Console.WriteLine("Item is null");
         }
      }
   }
}