在json.net中重命名JProperty [英] Rename JProperty in json.net
问题描述
我具有以下属性
{
"bad":
{
"Login": "someLogin",
"Street": "someStreet",
"House": "1",
"Flat": "0",
"LastIndication":
[
"230",
"236"
],
"CurrentIndication":
[
"263",
"273"
],
"Photo":
[
null,
null
]
}
}
,以及如何将其从坏"重命名为好".是的,我看到了Abi Bellamkonda的扩展方法
and how can I rename this from 'bad' to 'good' for example. Yes, I saw the extension method by Abi Bellamkonda
public static class NewtonsoftExtensions
{
public static void Rename(this JToken token, string newName)
{
var parent = token.Parent;
if (parent == null)
throw new InvalidOperationException("The parent is missing.");
var newToken = new JProperty(newName, token);
parent.Replace(newToken);
}
}
但是它得到了成功
无法将Newtonsoft.Json.Linq.JProperty添加到 Newtonsoft.Json.Linq.JProperty.
Can not add Newtonsoft.Json.Linq.JProperty to Newtonsoft.Json.Linq.JProperty.
推荐答案
以某种与直觉相反的方式,该扩展方法假定您要传递给它的token
是JProperty
的 value ,不是JProperty
本身.大概是为了使它易于使用方括号语法:
Somewhat counterintuitively, that extension method assumes that the token
you are passing to it is the value of a JProperty
, not the JProperty
itself. Presumably, this is to make it easy to use with the square bracket syntax:
JObject jo = JObject.Parse(json);
jo["bad"].Rename("good");
如果对属性有引用,则可以像下面这样在属性的Value
上调用该扩展方法:
If you have a reference to the property, you can still use that extension method if you call it on the property's Value
like this:
JObject jo = JObject.Parse(json);
JProperty prop = jo.Property("bad");
prop.Value.Rename("good");
但是,这使代码看起来很混乱.最好改进扩展方法,使其在两种情况下都可以使用:
However, that makes the code seem confusing. It would be better to improve the the extension method so that it will work in both situations:
public static void Rename(this JToken token, string newName)
{
if (token == null)
throw new ArgumentNullException("token", "Cannot rename a null token");
JProperty property;
if (token.Type == JTokenType.Property)
{
if (token.Parent == null)
throw new InvalidOperationException("Cannot rename a property with no parent");
property = (JProperty)token;
}
else
{
if (token.Parent == null || token.Parent.Type != JTokenType.Property)
throw new InvalidOperationException("This token's parent is not a JProperty; cannot rename");
property = (JProperty)token.Parent;
}
// Note: to avoid triggering a clone of the existing property's value,
// we need to save a reference to it and then null out property.Value
// before adding the value to the new JProperty.
// Thanks to @dbc for the suggestion.
var existingValue = property.Value;
property.Value = null;
var newProperty = new JProperty(newName, existingValue);
property.Replace(newProperty);
}
然后您可以执行以下操作:
Then you can do:
JObject jo = JObject.Parse(json);
jo.Property("bad").Rename("good"); // works with property reference
jo["good"].Rename("better"); // also works with square bracket syntax
提琴: https://dotnetfiddle.net/RSIdfx
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