嗨，盖兹(Guyz)，您能给我一个容易理解的typeof()含义吗?

问题描述

嗨盖兹，

我对使用Typeof()感到困惑，因为它的工作方式和用途

Google无法给我一个明确的答案

您能否给出一个易于理解的typeof();含义?

对于此示例:

hi guyz,

i''m confused of using Typeof(), on how it works and what''s for

google can''t give me a clear answer

can you give an easy-to-understand meaning of typeof();

for this example:

//where Customer in a class
typeof(Customer)


//Customer class
public class Customer
    {
     
        public string SayHello(string name)
        {
            return "Hello" + name + "!...";
        
        }

    }

谢谢Guyz，我将感谢您的回答！

thanks guyz i''ll appreciate ur answer!

推荐答案

class Customer {/*...*/}

class ValuedCustomer : Customer {/*...*/}

//...

//usually, using such methods means abuse of OOP but can be useful in some special cases:
static bool IsDerivedCustomer(Customer customer) {
   return typeof(Customer) == customer.GetType();
}

//...

Customer customer = new Customer();
Customer valuedCustomer = new ValuedCustomer();

if (IsDerivedCustomer(customer)) //will return false
   System.Console.WriteLine("This is a base type. Learn OOP");
else
   System.Console.WriteLine("This is a derived type. Learn OOP anyway");

if (valuedCustomer is Customer) //will return true
   System.Console.WriteLine(
        "This is a Customer;" + 
        "this method helps to check if an instance belongs to the class hierarchy");

—SA

—SA

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