静态类型不能用作返回类型 [英] static types cannot be used as return types

问题描述

我有一堂课：

公共静态课HOW_GOOD

{

静态字符串[] mstrHowGood =

{

" A"，

" G"，

" NTB"，

" ; T"

};

公共静态字符串真棒

{

get

{

返回mstrHowGood [0];

}

}

公共静态字符串GREAT

{

get

{

返回mstrHowGood [1];

}

}

公共静态字符串NOT_TOO_BAD

{

get

{

return mstrHowGood [2];

}

}

public static string TERRIBLE

{

get

{

返回mstrHowGood [2];

}

}


}

但是当我将它用作返回类型时出现错误

HOW_GOOD''：静态类型不能用作返回类型


我试图这样做

公共课MyClass

{

public HOW_GOOD HowAreYouDoing（string MyName）

{

返回HOW_GOOD.NOT_TOO_BAD;

}

}


有什么方法吗？这是imporper编程吗？ ？


提前致谢


Sanjay

解决方案

>公共静态类HOW_GOOD

为什么你的类本身被声明为静态？

我不认为我曾见过类似的事情。

我甚至不确定这对班级意味着什么。


-

Adam Clauss

" Sanjay Pais" < SA **** @ nospam.com>在消息中写道

新闻：ez ************** @ tk2msftngp13.phx.gbl ...

我有一节课：
公共静态类HOW_GOOD
{
静态字符串[] mstrHowGood =
{
" A"，
" G"，
NTB，
T
};
公共静态字符串AWESOME
{
获取
{
返回mstrHowGood [0 ];
}
}
公共静态字符串GREAT
{
获取
返回mstrHowGood [1];
}
}
公共静态字符串NOT_TOO_BAD
{
获取
{
返回mstrHowGood [2];
}
} {
获得
返回mstrHowGood [2];
}
}
}

但是当我将它用作返回类型时出现错误
HOW_GOOD''：静态类型不能用作返回类型

我试图这样做
公共课MyClass
{公共HOW_GOOD HowAreYouDoing（字符串MyName）
{
返回HOW_GOOD。 NOT_TOO_BAD;
}
}

有什么方法吗？这是imporper编程吗？ ？

提前致谢

Sanjay

Sanjay Pais< sa * ***@nospam.com>写道：

我有一个班级：
公共静态课HOW_GOOD


< snip>

有没有绕过这个？这是imporper编程吗？ ？

是的。静态类的要点是没有它的实例 -

因此你永远不会有一个除null之外的任何

值的变量。 br />

在你的代码中，你有：


public HOW_GOOD HowAreYouDoing（string MyName）

{

返回HOW_GOOD.NOT_TOO_BAD;

}


但是HOW_GOOD.NOT_TOO_BAD的类型不是HOW_GOOD - 它是字符串！你应该声明方法返回一个字符串，所有这些都将是

罚款。


你究竟在尝试什么？完成？


-

Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet

如果回复小组，请不要给我发邮件

Adam Clauss< ca ***** @ tamu.edu>写道：

public static class HOW_GOOD

为什么你的类本身被声明为静态？
我不认为我我以前见过这样的事情。
我甚至不确定这对于一个班级来说意味着什么。

这是一个新的C＃2.0的功能。这意味着没有构造函数（没有

在C＃v1中是不可能的），类是最终的，并且

所有成员（除了继承的成员）必须是静态的。


我不确定（还没有安装VS 2005的测试版）

静态类是否可以派生自另一个类，虽然

的有用性即使你可以也是有问题的。


-

Jon Skeet - < sk * **@pobox.com>
http://www.pobox.com/ 〜双向飞碟

如果回复小组，请不要给我发邮件

I have a class:
public static class HOW_GOOD
{
static string[] mstrHowGood =
{
"A",
"G",
"NTB",
"T"
};
public static string AWESOME
{
get
{
return mstrHowGood[0];
}
}
public static string GREAT
{
get
{
return mstrHowGood[1];
}
}
public static string NOT_TOO_BAD
{
get
{
return mstrHowGood[2];
}
}
public static string TERRIBLE
{
get
{
return mstrHowGood[2];
}
}

}
But I get an error when I use it as a return type
HOW_GOOD'': static types cannot be used as return types

I tried to do this
Public class MyClass
{
public HOW_GOOD HowAreYouDoing(string MyName)
{
return HOW_GOOD.NOT_TOO_BAD;
}
}

Is there any way around this? Is this the "imporper programming" ?

Thanks in advance

Sanjay

解决方案

> public static class HOW_GOOD
Why is your class itself declared as static?
I don''t think I''ve ever seen something like that done before.
I''m not even sure what that means for a class.

--
Adam Clauss

"Sanjay Pais" <sa****@nospam.com> wrote in message
news:ez**************@tk2msftngp13.phx.gbl...

I have a class:
public static class HOW_GOOD
{
static string[] mstrHowGood =
{
"A",
"G",
"NTB",
"T"
};
public static string AWESOME
{
get
{
return mstrHowGood[0];
}
}
public static string GREAT
{
get
{
return mstrHowGood[1];
}
}
public static string NOT_TOO_BAD
{
get
{
return mstrHowGood[2];
}
}
public static string TERRIBLE
{
get
{
return mstrHowGood[2];
}
}

}
But I get an error when I use it as a return type
HOW_GOOD'': static types cannot be used as return types

I tried to do this
Public class MyClass
{
public HOW_GOOD HowAreYouDoing(string MyName)
{
return HOW_GOOD.NOT_TOO_BAD;
}
}

Is there any way around this? Is this the "imporper programming" ?

Thanks in advance

Sanjay

Sanjay Pais <sa****@nospam.com> wrote:

I have a class:
public static class HOW_GOOD
<snip>
Is there any way around this? Is this the "imporper programming" ?

Yes. The point of a static class is that there are no instances of it -
you therefore could never have a variable of that type which had any
value other than null.

In your code, you have:

public HOW_GOOD HowAreYouDoing(string MyName)
{
return HOW_GOOD.NOT_TOO_BAD;
}

but the type of HOW_GOOD.NOT_TOO_BAD is not HOW_GOOD - it''s string! You
should therefore declare the method to return a string, and all will be
fine.

What are you actually trying to accomplish?

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Adam Clauss <ca*****@tamu.edu> wrote:

public static class HOW_GOOD

Why is your class itself declared as static?
I don''t think I''ve ever seen something like that done before.
I''m not even sure what that means for a class.

It''s a new feature of C# 2.0. It means there are no constructors (none
whatsoever - something impossible in C# v1), the class is final, and
all members (other than those inherited) must be static.

I''m not sure (having not installed the beta of VS 2005 yet) whether a
static class can derive from another class or not, although the
usefulness of it would be questionable even if you could.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

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