问题描述
我想将 map [int] string
转换为 json
,所以我认为 json.Marshal()
可以做到这一点,但是它失败时说不支持的类型 map [int] string
。但是,如果我使用 map
键字符串,它可以正常工作。
稍后在检查编组代码时,显式检查密钥是否不是字符串,并返回 UnsupportedTypeError
...
为什么我甚至不能使用基元作为键?如果json标准不允许非字符串键,不应该 json.Marshal
将原语转换为字符串并将它们用作键?
看看Json的语法:
pair
string:value
string
chars
完整的语法可在。
不幸的是,要使用整数作为键,必须将它们转换为例如使用 strconv.Itoa
:它不能达到 json
包来完成这项工作。 / p>
I want to convert a map[int]string
to json
, so I thought json.Marshal()
would do the trick, but it fails saying unsupported type map[int]string
. But whereas if I use a map
with key string it works fine.
http://play.golang.org/p/qhlS9Nt8qQ
Later on inspection of the marshaller code, there is an explicit check to see if the key is not string and returns UnsupportedTypeError
...
Why can't I even use primitives as keys? If json standard doesn't allow non string keys, shouldn't json.Marshal
convert the primitives to string and use them as keys ?
It's not because of Go, but because of Json: Json does not support anything else than strings for keys.
Have a look a the grammar of Json:
pair
string : value
string
""
" chars "
The full grammar is available on the Json website.
Unfortunately, to use integers as keys, you must convert them to string beforehand, for instance using strconv.Itoa
: it is not up to the json
package to do this work.
这篇关于无法使用非字符串键的json.marshal映射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!