C# 必须声明一个主体，因为它没有被标记为抽象的
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must declare a body because it's not marked abstract
提问by user1765862
I have interface
我有接口
INews.cs
public interface INews{
int Id {get; set;}
string Name {get; set;}
void Add(News news);'
void Remove(News news);
}
and I have News.cs which implements that interface
我有实现该接口的 News.cs
public class News:INews{
public int Id {get; set;}
public string Name {get; set;}
public void Add(News news);
public void Remove(News news);
}
}
on compile I have following message must declare a body because it's not marked abstract
在编译时我有以下消息 必须声明一个主体，因为它没有标记为抽象
is that mean that I should declare body inside constructor of News class?
这是否意味着我应该在 News 类的构造函数中声明 body？
采纳答案by Jens Kloster
Its your implementation
它是你的实现
public class News: INews
{
public int Id {get; set;}
public string Name {get; set;}
public void Add(News news); //<-- invalid
public void Remove(News news); //<-- invalid
}
should at least be
至少应该是
public class News: INews
{
public int Id {get; set;}
public string Name {get; set;}
public void Add(News news){
}
public void Remove(News news){
}
}
回答by nvoigt
Your functions need bodies:
您的功能需要机构：
public void Add(News news)
{
}
public void Remove(News news)
{
}
Functions without bodies are only allowed in abstract classes.
没有主体的函数只允许在抽象类中使用。
回答by Oded
It means that you have not make your Newsclass an abstractclass.
这意味着你还没有让你的News班级成为一个abstract班级。
In a class that is not an abstractclass, the methods must have implementations, not just declarations.
在不是abstract类的类中，方法必须有实现，而不仅仅是声明。
回答by Nate
the method must declare a body if its notan abstractclass
如果该方法必须声明主体不是一abstract类
public void Add(News news)
{
}
public void Remove(News news)
{
}
