检查对象是否为相同类型 [英] Checking if the object is of same type

问题描述

您好，我需要知道如何在C#中检查相同类型的对象.

Hello I need to know how to check if the object of the same type in C#.

场景:

class Base_Data{}

class Person : Base_Data { }
class Phone  : Base_data { }

class AnotherClass
{
   public void CheckObject(Base_Data data)
   {
         if (data.Equals(Person.GetType()))
         { //<-- Visual Studio 2010 gives me error, says that I am using 'Person' is a type and not a variable.

        }
    }
}

推荐答案

您可以使用 is 运算符:

You could use the is operator:

if (data is Person)
{
    // `data` is an instance of Person
}

另一种可能性是使用 as 运算符:

Another possibility is to use the as operator:

var person = data as Person;
if (person != null)
{
    // safely use `person` here
}

或者，从 C# 7 开始，使用 结合了以上两个的is操作符的模式匹配形式:

Or, starting with C# 7, use a pattern-matching form of the is operator that combines the above two:

if (data is Person person)
{
    // `data` is an instance of Person,
    // and you can use it as such through `person`.
}

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