如何使用json.net做JSON的递归下降? [英] How to do recursive descent of json using json.net?
问题描述
我试图解析使用json.net一个JSON文件。该文件看起来像这样
{X:
{
标题:富,
XXXX:XXXX
}
}
{Y:
{ZZ:
{标题:酒吧,...}
}
}
我试图递归下降这种结构的处理具有title属性的所有对象。但我困惑的 JToken
, JProperty
, JContainer
, JValue
, JObject
。阅读源代码并没有给我留下更聪明,没有样品的帮助。我想沿着
线
WalkNode(节点,动作<节点>动作)的东西
{
的foreach(在node.Children VAR孩子)
{
动作(孩子);
WalkNode(小孩);
}
}
解析()
{
WalkNode(根,N =>
{
如果(N [标题] = NULL)
{
:
}
})!;
}
下面的代码应该是相当靠近你在找什么。我提出的假设,即有一个外阵列,并且该阵列可在层次结构中的任何位置。使用(如果这是不正确的,可以简化WalkNode法码了一点,但它应该工作无论哪种方式。)
系统;
使用Newtonsoft.Json;
使用Newtonsoft.Json.Linq;
命名空间JsonRecursiveDescent
{
类节目
{
静态无效的主要(字串[] args)
{
串JSON =
@[
{
X:
{
标题:富,
XXXX:XXXX
}
},
{
Y:
{
,ZZ:
{
标题:酒吧,
XXXX:XXXX
}
}
}
];
JToken节点= JToken.Parse(JSON);
WalkNode(节点,N =>
{
JToken令牌= N [标题];
如果(标记=空&安培;!&安培;令牌.TYPE == JTokenType.String)
{
字符串标题= token.Value<串GT;();
Console.WriteLine(职称);
}
} );
}
静态无效WalkNode(JToken节点,动作< JObject>动作)
{
如果(node.Type == JTokenType.Object)
{
动作((JObject)节点);
的foreach(JProperty孩子node.Children< JProperty>())
{
WalkNode(child.Value,动作);
}
}
,否则如果(node.Type == JTokenType.Array)
{
的foreach(JToken孩子node.Children())
{
WalkNode(儿童,动作);
}
}
}
}
}
I am trying to parse a json file using json.net. The file looks like this
{X:
{
Title:"foo",
xxxx:xxxx
}
}
{Y:
{ZZ:
{Title: "bar",...}
}
}
I am trying to recurse down this structure processing all objects with a Title attribute. But I am confused about JToken
, JProperty
, JContainer
, JValue
, JObject
. Reading the source code has not left me much wiser and none of the samples help. I want something along the lines of
WalkNode(node, Action<Node> action)
{
foreach(var child in node.Children)
{
Action(child);
WalkNode(child);
}
}
Parse()
{
WalkNode(root, n=>
{
if(n["Title"] != null)
{
...
}
});
}
The code below should be pretty close to what you are looking for. I made the assumption that there is an outer array, and that arrays can appear anywhere in the hierarchy. (If this is not true, you can simplify the WalkNode method code a bit, but it should work either way.)
using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace JsonRecursiveDescent
{
class Program
{
static void Main(string[] args)
{
string json =
@"[
{
""X"":
{
""Title"":""foo"",
""xxxx"":""xxxx""
}
},
{
""Y"":
{
""ZZ"":
{
""Title"":""bar"",
""xxxx"":""xxxx""
}
}
}
]";
JToken node = JToken.Parse(json);
WalkNode(node, n =>
{
JToken token = n["Title"];
if (token != null && token.Type == JTokenType.String)
{
string title = token.Value<string>();
Console.WriteLine(title);
}
});
}
static void WalkNode(JToken node, Action<JObject> action)
{
if (node.Type == JTokenType.Object)
{
action((JObject)node);
foreach (JProperty child in node.Children<JProperty>())
{
WalkNode(child.Value, action);
}
}
else if (node.Type == JTokenType.Array)
{
foreach (JToken child in node.Children())
{
WalkNode(child, action);
}
}
}
}
}
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