按字段逐字段读取结构 [英] Reading a struct, field by field

问题描述

有没有办法按字段读取结构字段？


我想编写一个相当通用的函数，例如：


公共字符串EncodeStruct（struct strct）

{

....

}


哪个接受一般结构类型，逐字段读取，每个字段编码

，具体取决于其类型（即整数字段编码是不同于布尔值的
），连接将结果转换为字符串并返回它。

Is there a way to read a struct field by field?

I want to write a rather general function, like:

public string EncodeStruct (struct strct)
{
....
}

which accepts a general struct type, reads it field by field, encodes
each field depending on its type (i.e. an integer field is encoding is
different than a boolean), concatenates the results into a string and
returns it.

推荐答案

Sadeq写道：

有没有办法按字段读取结构域？

我想编写一个相当通用的函数，如：

公共字符串EncodeStruct（struct strct）<接受一般结构类型，逐字段读取，根据类型对每个字段进行编码（即{> /


一个整数字段的编码与布尔值不同，连接起来将结果转换为字符串并将其返回。

Is there a way to read a struct field by field?

I want to write a rather general function, like:

public string EncodeStruct (struct strct)
{
...
}

which accepts a general struct type, reads it field by field, encodes
each field depending on its type (i.e. an integer field is encoding is
different than a boolean), concatenates the results into a string and
returns it.

查看Type.GetFields。


注意你不可能有像你现在那样的方法签名

。如果您使用的是.NET 2.0，则可以执行以下操作：


公共字符串EncodeStruct< T> （T值）其中T：struct

{

类型类型= typeof（T）;

...

}


如果您使用的是1.1，那么您可能需要获得拳击的价值

值并签名方法只是EncodeStruct（对象

值）。


Jon

Have a look at Type.GetFields.

Note that you can''t have a method signature like the one you''ve got at
the moment. If you''re using .NET 2.0, you can do something like:

public string EncodeStruct<T> (T value) where T : struct
{
Type type = typeof(T);
...
}

If you''re using 1.1, you''ll probably need to take the hit of boxing the
value and make the signature of the method just EncodeStruct(object
value).

Jon

Jon Skeet [C＃MVP]写道：


< snip>

Jon Skeet [C# MVP] wrote:

<snip>

请注意，你不能拥有像你这样的方法签名那时候已经到了。如果您使用的是.NET 2.0，则可以执行以下操作：

公共字符串EncodeStruct< T> （T值）其中T：struct
{
类型类型= typeof（T）;
...
}
如果你是使用1.1，你可能需要攻击装箱的值
并使方法的签名只是EncodeStruct（对象
值）。

Note that you can''t have a method signature like the one you''ve got at
the moment. If you''re using .NET 2.0, you can do something like:

public string EncodeStruct<T> (T value) where T : struct
{
Type type = typeof(T);
...
}

If you''re using 1.1, you''ll probably need to take the hit of boxing the
value and make the signature of the method just EncodeStruct(object
value).

实际上，进一步考虑它，你必须至少一次击中

拳击，因为FieldInfo.GetValue将对象视为

参数。


Jon

Actually, thinking about it further, you''ll have to take the hit of
boxing at least once anyway, as FieldInfo.GetValue takes object as a
parameter.

Jon

非常感谢。这对我有很大的帮助。


我使用的是.NET 2.0语法，现在我可以实现自己的编码器了。


但是当我想编码嵌套结构时出现了另一个问题。我尝试递归使用它是
，但我编译器无法将获得的

字段（通常是一个对象）转换为结构。


有没有办法解决这个问题？

Thanks a lot. That was of great help.

I used .NET 2.0 syntax, and now I''m able to implement my own encoder.

But another issue arose when I wanted to encode nested structs. I tried
to use it recursively, but I the compiler cannot cast the obtained
field (which is an object, in general) to a struct.

Is there a way to overcome this issue?

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