委托自定义属性 [英] delegate in custom attribute
问题描述
我有一个自定义属性，我用于枚举中的字段。
我想在这些事情中传递一个代表。
所以我想做这样的事情
[MyCustomAttrb（字符串名称，字符串desc，int值，委托clickEvent）]
这可能吗？我没有运气。
Nathan Laff< re ****** @ hotmail.comwrote：
< blockquote class =post_quotes>
我有一个自定义属性，我用于枚举中的字段。
我想在这些事情中传递一个代表。 />
所以我想做这样的事情
[MyCustomAttrb（字符串名称，字符串desc，int值，委托clickEvent）]
这可能吗？我没有运气。
编号属性参数受规范限制：
< quote>
属性类的位置和命名参数的类型是
仅限于属性参数类型，它们是：
*以下类型之一：bool ，byte，char，double，float，int，
long，short，string。
*类型对象。
*类型系统.Type。
*枚举类型，前提是它具有公共可访问性，并且嵌套的类型
（如果有的话）也具有公共可访问性。
*以上类型的单维数组。
< / quote>
-
Jon Skeet - < sk *** @ pobox.com>
http：// www.pobox.com/~skeet 博客： http：// www。 msmvps.com/jon.skeet
如果回复小组，请不要给我发邮件
这并不意味着你不能揭露一个会占用
$ b的方法/事件$ b委托但是。您可以通过反射获取属性，然后将
您的委托传递给方法/事件。
然而，这有点无意义，因为你不能在属性和分配给它的内容之间建立关联
（来自属性，
）。
-
- Nicholas Paldino [.NET / C＃MVP]
- mv*@spam.guard.caspershouse.com
" Jon Skeet [C＃MVP]" < sk *** @ pobox.com写了留言
新闻：MP *********************** @ msnews.microsoft .co m ...
Nathan Laff< re ****** @ hotmail.comwrote：
>我有一个自定义属性，我用于枚举中的字段。
我想在这些事情中传递一个代表。
所以我想要做这样的事情
[MyCustomAttrb（字符串名称，字符串desc，int值，委托clickEvent）]
这可能吗？我没有运气。
编号属性参数受规范限制：
< quote>
属性类的位置和命名参数的类型是
仅限于属性参数类型，它们是：
*以下类型之一：bool ，byte，char，double，float，int，
long，short，string。
*类型对象。
*类型系统.Type。
*枚举类型，前提是它具有公共可访问性，并且嵌套的类型
（如果有的话）也具有公共可访问性。
*以上类型的单维数组。
< / quote>
-
Jon Skeet - < sk *** @ pobox.com>
http：// www.pobox.com/~skeet 博客： http：// www。 msmvps.com/jon.skeet
如果重新请小组，请不要给我发邮件
没有。属性参数受规范限制：
>
< quote>
位置类型属性类的命名参数是
仅限于属性参数类型，它们是：
*以下类型之一：bool，byte，char ，double，float，int，
long，short，string。
*类型对象。
*类型System.Type。
*枚举类型，只要它具有公共可访问性，并且嵌套的类型
（如果有的话）也具有公共可访问性。
*上述类型的一维数组。
< / quote>
这不可能完全正确，因为它在
属性构造函数中使用Delegate类型构建？我似乎无法在其中得到任何工作
：P
I have a custom attribute which i use for fields in an enum.
I want to pass around a delegate in these things.
so i want to do something like this
[MyCustomAttrb(string name, string desc, int value, delegate clickEvent)]
Is this possible? i''m having no luck.
Nathan Laff <re******@hotmail.comwrote:I have a custom attribute which i use for fields in an enum.
I want to pass around a delegate in these things.
so i want to do something like this
[MyCustomAttrb(string name, string desc, int value, delegate clickEvent)]
Is this possible? i''m having no luck.No. Attribute parameters are limited by the spec:
<quote>
The types of positional and named parameters for an attribute class are
limited to the attribute parameter types, which are:
* One of the following types: bool, byte, char, double, float, int,
long, short, string.
* The type object.
* The type System.Type.
* An enum type, provided it has public accessibility and the types
in which it is nested (if any) also have public accessibility.
* Single-dimensional arrays of the above types.
</quote>
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
It doesn''t mean that you can''t expose a method/event which will take the
delegate though. You can get the attribute through reflection and then pass
your delegate to the method/event.
However, it''s kind of pointless, since you can''t make a correlation
between the attribute and what it''s assigned to (from within the attribute,
that is).
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com
"Jon Skeet [C# MVP]" <sk***@pobox.comwrote in message
news:MP***********************@msnews.microsoft.co m...Nathan Laff <re******@hotmail.comwrote:>I have a custom attribute which i use for fields in an enum.
I want to pass around a delegate in these things.
so i want to do something like this
[MyCustomAttrb(string name, string desc, int value, delegate clickEvent)]
Is this possible? i''m having no luck.
No. Attribute parameters are limited by the spec:
<quote>
The types of positional and named parameters for an attribute class are
limited to the attribute parameter types, which are:
* One of the following types: bool, byte, char, double, float, int,
long, short, string.
* The type object.
* The type System.Type.
* An enum type, provided it has public accessibility and the types
in which it is nested (if any) also have public accessibility.
* Single-dimensional arrays of the above types.
</quote>
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
No. Attribute parameters are limited by the spec:>
<quote>
The types of positional and named parameters for an attribute class are
limited to the attribute parameter types, which are:
* One of the following types: bool, byte, char, double, float, int,
long, short, string.
* The type object.
* The type System.Type.
* An enum type, provided it has public accessibility and the types
in which it is nested (if any) also have public accessibility.
* Single-dimensional arrays of the above types.
</quote>That can''t be entirely true as it builds with a Delegate type in the
attribute contructor? I just can''t seem to get anything to work right in it
:P
这篇关于委托自定义属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
