这些括号是什么以及如何使用它们？ [英] What are these parentheses and how do I use them?

问题描述

所以我目前正在学习C＃，在教科书中我通过课程时遇到了这段代码。

 class Employee：IComparable 
 {
 public int IdNumber {get; set;} 
 public double Salary {get; set;} 
 int IComparable.CompareTo（Object o）
 {
 int returnVal; 
员工临时=（员工）o; 
 if（this.IdNumber> temp.IdNumber）
 returnVal = 1; 
 else 
 if（this.IdNumber< temp.IdNumber）
 returnVal = -1; 
 else 
 returnVal = 0; 
返回returnVal; 
} 
} 

在第8行，它说：

员工临时=（员工）o; 

似乎绑定对象"o"到班级"员工"。在整本教科书中，我没有看到像这样使用括号，我想要一个解释，我觉得这是最好的地方......

提前谢谢

  - Michael

解决方案

 括号用于投射（在本例中）o来键入Employee。请参阅

以下文档。

So I am currently learning C# and in the textbook I came across this block of code while going through Classes.

class Employee : IComparable
{
 public int IdNumber {get; set;}
 public double Salary {get; set;}
 int IComparable.CompareTo(Object o)
 {
 int returnVal;
 Employee temp = (Employee)o;
 if(this.IdNumber > temp.IdNumber)
 returnVal = 1;
 else
 if(this.IdNumber < temp.IdNumber)
 returnVal = -1;
 else
 returnVal = 0;
 return returnVal;
 }
}

In line 8 where it says:

Employee temp = (Employee)o;

it seems to bind the object "o" to the class "Employee". In the entire textbook I have not seen the use of parenthesis like this and I would like an explanation and I feel like this is the best place to ask...

Thanks in advance
 - Michael

解决方案

The parentheses are used to cast (in this case) o to type Employee. See the following documentation.

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