请说明有关"ref"数据类型的信息.以及如何将其用作函数调用和函数定义中的参数?请举例说明. [英] Please explain about the 'ref' datatype. And how it can be used as an argument in function calling and function definition? Please explain with an eg.

问题描述

请说明有关"ref"数据类型的信息.以及如何将其用作函数调用和函数定义中的参数?请使用eg.

Please explain about the ''ref'' datatype. And how it can be used as an argument in function calling and function definition? Please explain with an eg.

推荐答案

csharp中的Ref数据类型像c ++中的指针一样进行解释.

假设

Ref data type in csharp works like a pointer in c++.

Assume that

public bool functionTest(int a,int b, ref long c)
{
   c=a*b;
}

现在，如果我调用上面的函数

Now if i call the above function

int c;
functionTest(2,3, ref  c)
system.out.print("{0}",c);

它打印出6.

在这里，a，b跟随值机制，c跟随参考机制.如果u更改c值，它将反映所有位置.

有关更多示例，请访问

http://msdn.microsoft.com/en-us/library/0f66670z％28v = vs.71％29.aspx [ ^ ]

it prints 6.

Here a,b are follows pass by value mechanism and c follows pass by reference mechanism. If u change the c value it reflects every where.

For more examples go thru

http://msdn.microsoft.com/en-us/library/0f66670z%28v=vs.71%29.aspx[^]

在通过参数将值传入和传出方法时，可以使用ref.引用要求在传递值之前先对其赋值.
这是一个可以帮助您的链接.
ref和 [

You can use ref when you are passing a value into and out of a method by a parameter. Ref requires values to be assigned before passing them in.
Here is a link that may help you out.
What is the difference between the ref and out keywords in C#?[^]
Good luck.

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