C# -delegate array - 如何添加 tostring 方法

Question

是否可以将 ToString 方法添加到委托数组中？如果有怎么办？？这是我写的代码：

public delegate string Task();

        public static void Main(string[] args)
    {
        ArrayList studentArray = new ArrayList();
        Course italianCook = new ItalianCookCourse { Teacher = "Ben Hodd" };
        Course seafoodCook = new SeafoodCookCourse { Teacher = "Harry Cotter"};
        Course sewingCourse = new SewingCourse
        {
            Teacher = "Margaret Mair",
            ChargePerStudent = scFee,
            CostPerStudent = 100.00m,
        };
        Course creativeWrite = new CreativeWritCourse { Teacher = "Mary Smith };
        Course businessWrite = new BusinessWritCourse { Teacher = "Mary Smith" };
        Task[] tasks = new Task(italianCook.ToString, seafoodCook.ToString, sewingCourse.ToString);

错误信息是“string Class.ToString()” - “Method name expected”

由于tostring方法处理为字符串，是否可以添加到delagate中？？

Answer 1

假设您修正了语法，解决方案是从 ToString 的末尾删除 ()。要基于方法创建委托，只需提供其名称即可。

Task[] tasks = new Task[] { Class1.ToString, Class2.ToString }

注意上面的代码实际上并没有编译。 ToString() 不是一个静态方法，所以你需要传入一个对象引用和函数名：

object o = new object();
Task[] tasks = new Task[] { o.ToString };