c# - 更新对象数组

Question

我有一个具有以下格式的 json 文件:

{
  "value": [
    {
      "ccCode": "1234",
      "attributes": {
        "ePCode": 23467
      }
    },
    {
      "ccCode": "1234",
      "attributes": {
        "ePCode": 23467
      }
    }
  ]
}

我简化了 json，但它在 attributes 属性中有更多的字段和更多的嵌套属性。我试图遍历值数组中的对象，并检索它的两个属性。基于这两个值，我将获取第三个值并将其作为附加属性添加到 attributes 属性中。所以最后我想要:

{
  "value": [
    {
      "ccCode": "1234",
      "attributes": {
        "ePCode": 23467,
        "newFlag": true
      }


  },
    {
      "ccCode": "1234",
      "attributes": {
        "ePCode": 23467,
         "newFlag": false
      }
    }
  ]
}

我创建了下面的代码。到目前为止，我可以获取我感兴趣的属性。我的问题是尝试更新它。任何帮助将不胜感激。

string templateFile = @"C:\Users\template.json";
//rss
JObject template = JObject.Parse(File.ReadAllText(templateFile));

foreach (var record in template)
{
    string name = record.Key;
    JToken value = record.Value;
    foreach(var obj in value)
    {
        //fetch two values from each json object, 
        //based on these , fetch a flag and then add it to the json object
        var ep = obj["attributes"];
        ep = ep["ePCode"].Value<int?>();
        var cost = obj["ccCode"].ToString();
        bool isCostValuable = isCostValuable((int)ep, cost);

        ///want to add a new property in the property attributes
        //this is where I get stuck
        foreach(JProperty prop in obj)
        {
            if (prop.Name == "attributes")
            {
                JObject first = (JObject)obj;
                JArray item = (JArray)first["attributes"];
            }
        }
    }
}

Answer 1

你非常接近，你只需要用 ep.Add( 调用替换最里面的 foreach 循环，然后你可以通过调用 template.ToString( );

string templateFile = @"C:\Users\template.json";
string outputFile = @"C:\Users\output.json";
//rss
JObject template = JObject.Parse(File.ReadAllText(templateFile));

foreach (var record in template)
{
    string name = record.Key;
    JToken value = record.Value;
    foreach(var obj in value)
    {
        //fetch two values from each json object, 
        //based on these , fetch a flag and then add it to the json object
        var ep = obj["attributes"];
        ep = ep["ePCode"].Value<int?>();
        var cost = obj["ccCode"].ToString();
        bool isCostValuable = isCostValuable((int)ep, cost);

        ep.Add("newFlag", isCostValuable);
    }
}

File.WriteAllText(outputFile, templateFile.ToString());