DebuggerDisplay和DebuggerTypeProxy

DebuggerDisplay和DebuggerTypeProxy是两个属性，用来在VS调试的状态下，显示一些额外的信息，方便用户进行调试。

DebuggerDisplay 不单能够显示变量的值，还能调用变量的方法来计算结果显示：

class Program
    {
        static void Main(string[] args)
        {
            Company c = new Company();

            Console.ReadLine();
        }
    }

    [DebuggerDisplay("company name:{name}, employee count:{employeeNames.Count}")]
    class Company
    {
        public string name = "Company1";

        List<string> employeeNames = new List<string>() { "Employee1", "Employee2", "Employee3" };
    }

DebuggerTypeProxy 可以附加一些属性在VS调试窗口中，提供了更加灵活的方式。如果DebugView中的属性和类型本身的属性名字相同，那么类型的属性将会被覆盖，在VS调试器中看不见了。

class Program
    {
        static void Main(string[] args)
        {
            Company2 c2 = new Company2();
            Debugger.Break();
            Console.ReadLine();
        }
    }

    [DebuggerTypeProxy(typeof(Company2DebugView))]
    class Company2
    {
        internal class Company2DebugView
        {
            private Company2 m_Company2;

            //必须要有一个构造函数，包含目标类型
            public Company2DebugView(Company2 company2)
            {
                m_Company2 = company2;
            }

            public string Employees
            {
                get
                {
                    return String.Join(" | ", m_Company2.employeeNames.ToArray());
                }
            }
        }

        private string name = "Company2";

        private List<string> employeeNames = new List<string>() { "Employee1", "Employee2", "Employee3" };
    }