构造函数：this

Test.cs：

class Test
    {
        public string Name { get; set; }
        public string Address { get; set; }

        public Test()
            : this(null, null)
        {

        }

        public Test(string name)
            : this(name, null)
        {

        }

        public Test(string name, string address)
        {
            this.Name = name;
            this.Address = address;
        }
    }

Program.cs

 static void Main(string[] args)
        {
            Test test1 = new Test();
            Test test2 = new Test("测试1");
            Test test3 = new Test("测试2", "湖北");
            Console.WriteLine("Name:" + test1.Name + "...Address:" + test1.Address);
            Console.WriteLine("Name:" + test2.Name + "...Address:" + test2.Address);
            Console.WriteLine("Name:" + test3.Name + "...Address:" + test3.Address);
        }