C＃操纵JSON数据 [英] C# Manipulating JSON data

问题描述

我有一个简单的场景：看了一些JSON文件，过滤器或改变一些价值观和写入生成的JSON回不改变原来的格式

因此，例如，可以改变：

  {
类型：FeatureCollection，
CRS ：{
类型：EPSG，
特性：{
密码：28992 
} 
}，
的特点：
 {
类型：功能，
几何体：{
类型：多边形，
坐标：[ 
 [
 [
 149886.192，
 374554.705 
]，
 [
 149728.583，
 374473.112 
]，
〔
 149725.476，
 374478.215 
] 
] 
] 
} 
} 
] 
} 
  

进入这样的：

  {
类型：FeatureCollection，
CRS：{
类型：EPSG，
特性：{
密码：28992 
} 
}，
特色：
 {
类型：功能，
几何：{
类型：点，
坐标：
 [
 149886.192，
 374554.705 
] 
} 
} 
] 
} 
  

我试过JSON。科净等等newtonsoft但只有这个我能找到的是：

• 读入对象


• 写对象的JSON

但我错过了'改变对象的一步。 ？任何提示

的更新的

下面是我到目前为止已经试过：

  JToken contourManifest = JObject.Parse（输入）; 
 
 JToken功能= contourManifest.SelectToken（特征）; 
 
的for（int i = 0; I< features.Count（）;我++）
 {
 JToken几何=功能[I] .SelectToken（几何）; 
 JToken geoType = geometry.SelectToken（类型）; 
 JToken坐标= geometry.SelectToken（坐标）; 
 
 geoType =点; 
} 
  

但是，这只是改变了geoType变量的值。我有望改变值的在的几何体也是如此。我需要一个参考，不是副本！这可能吗？

的更新的

目前我过这个项目，但我倒是想给我的反馈给回答者。虽然我喜欢沙欣的简单，我喜欢L.B.的更正式的方法好一点。我个人不喜欢使用字符串值作为功能代码，但是这只是我。如果我能接受两个答案：我会的。我想沙欣西港岛线必须做出应有的与'只是'一个给予好评。

解决方案

 动态contourManifest = JObject.Parse（输入）; 
的foreach（在contourManifest.features VAR功能）
 {
 feature.geometry.Replace（
 JObject.FromObject（
新的{
型=点
坐标= feature.geometry.coordinates [0] [0] 
}））; 
} 
 
 VAR newJson = contourManifest.ToString（）; 
  

I have a 'simple' scenario: Read some JSON file, Filter or change some of the values and write the resulting json back without changing the original formatting.

So for example to change this:

{
  "type": "FeatureCollection",
  "crs": {
    "type": "EPSG",
    "properties": {
      "code": 28992
    }
  },
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              149886.192,
              374554.705
            ],
            [
              149728.583,
              374473.112
            ],
            [
              149725.476,
              374478.215
            ]
          ]
        ]
      }
    }
  ]
}

Into this:

{
  "type": "FeatureCollection",
  "crs": {
    "type": "EPSG",
    "properties": {
      "code": 28992
    }
  },
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": 
            [
              149886.192,
              374554.705
            ]
      }
    }
  ]
}

I've tried JSON.Net by newtonsoft among others but the only this I can find is:

• read into object
• write object to json

But I'm missing the 'change the object' step. Any hints?

Update

Here's what I've tried so far:

JToken contourManifest = JObject.Parse(input);

JToken features = contourManifest.SelectToken("features");

for (int i = 0; i < features.Count(); i++)
{
    JToken geometry = features[i].SelectToken("geometry");
    JToken geoType = geometry.SelectToken("type");
    JToken coordinates = geometry.SelectToken("coordinates");

    geoType = "Point";
}

But this only changes the value of the geoType variable. I'd expected to change the value inside the geometry as well. I need a reference, not a copy! Is this possible?

Update

I am currently off this project but I'd like to give my feedback to the answerers. Though I like the simplicity of Shahin, I like the more formal approach of L.B. a bit better. I personally don't like using string values as functional code, but that's just me. If I could accept both answers: I would. I guess Shahin wil have to make due with 'just' an upvote.

解决方案

dynamic contourManifest = JObject.Parse(input);
foreach (var feature in contourManifest.features)
{
    feature.geometry.Replace(
            JObject.FromObject(
                        new { 
                            type = "Point", 
                            coordinates = feature.geometry.coordinates[0][0] 
                        }));
}

var newJson = contourManifest.ToString();

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