Json.net重命名属性

Question

我有一个代表JSON的字符串，我想使用JSON.NET重命名一些属性。我需要一个通用函数来用于任何JSON。类似于：

public static void Rename(JContainer container, Dictiontionary<string, string> mapping)
{
  foreach (JToken el in container.Children())
  {
    JProperty p = el as JProperty;
    if(el != null && mapping.ContainsKey(p.Name))
    {
      // **RENAME THIS NODE!!**
    }
    // recursively rename nodes
    JContainer pcont = el as JContainer;
    if(pcont != null)
    {
      Rename(pcont, mapping);
    }
  }
}

怎么做？？

Answer 1

我建议用重命名的属性重建JSON。我认为你不应该担心速度处罚，因为这通常不是问题。以下是你的操作方法。

public static JToken Rename(JToken json, Dictionary<string, string> map)
{
    return Rename(json, name => map.ContainsKey(name) ? map[name] : name);
}
public static JToken Rename(JToken json, Func<string, string> map)
{
    JProperty prop = json as JProperty;
    if (prop != null) 
    {
        return new JProperty(map(prop.Name), Rename(prop.Value, map));
    }
    JArray arr = json as JArray;
    if (arr != null)
    {
        var cont = arr.Select(el => Rename(el, map));
        return new JArray(cont);
    }
    JObject o = json as JObject;
    if (o != null)
    {
        var cont = o.Properties().Select(el => Rename(el, map));
        return new JObject(cont);
    }
    return json;
}

这里有一个用法示例：

var s = @"{ ""A"": { ""B"": 1, ""Test"": ""123"", ""C"": { ""Test"": [ ""1"", ""2"", ""3"" ] } } }";
var json = JObject.Parse(s);
var renamed = Rename(json, name => name == "Test" ? "TestRenamed" : name);
renamed.ToString().Dump();  // LINQPad output
var dict = new Dictionary<string, string> { { "Test", "TestRenamed"} };
var renamedDict = Rename(json, dict);
renamedDict.ToString().Dump();  // LINQPad output

Answer 2

我们使用这种方法。您可以使用JObject的SelectToken（）找到您想要的属性。是的，它确实支持JsonPath。

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);
    }
}