NET问答: C# 中是否有 format json 的类库?

Posted 2021-07-04 dotNET跨平台

咨询区

• mpen：

我在寻找一个 function，它能够接收 string 格式的json，并且能够以 换行+缩进 的形式输出，比如：

{"status":"OK", "results":[ {"types":[ "locality", "political"], "formatted_address":"New York, NY, USA", "address_components":[ {"long_name":"New York", "short_name":"New York", "types":[ "locality", "political"]}, {"long_name":"New York", "short_name":"New York", "types":[ "administrative_area_level_2", "political"]}, {"long_name":"New York", "short_name":"NY", "types":[ "administrative_area_level_1", "political"]}, {"long_name":"United States", "short_name":"US", "types":[ "country", "political"]}], "geometry":{"location":{"lat":40.7143528, "lng":-74.0059731}, "location_type":"APPROXIMATE", "viewport":{"southwest":{"lat":40.5788964, "lng":-74.2620919}, "northeast":{"lat":40.8495342, "lng":-73.7498543}}, "bounds":{"southwest":{"lat":40.4773990, "lng":-74.2590900}, "northeast":{"lat":40.9175770, "lng":-73.7002720}}}}]} 

格式化后：

{
    "status":"OK",
    "results":[
        {
            "types":[
                "locality",
                "political"
            ],
            "formatted_address":"New York, NY, USA",
            "address_components":[
                {
                    "long_name":"New York",
                    "short_name":"New York",
                    "types":[
                        "locality",
                        "political"
                    ]
                },
                {
                    "long_name":"New York",
                    "short_name":"New York",
                    "types":[
                        "administrative_area_level_2",
                        "political"
                    ]
                },
                {
                    "long_name":"New York",
                    "short_name":"NY",
                    "types":[
                        "administrative_area_level_1",
                        "political"
                    ]
                },
                {
                    "long_name":"United States",
                    "short_name":"US",
                    "types":[
                        "country",
                        "political"
                    ]
                }
            ],
            "geometry":{
                "location":{
                    "lat":40.7143528,
                    "lng":-74.0059731
                },
                "location_type":"APPROXIMATE",
                "viewport":{
                    "southwest":{
                        "lat":40.5788964,
                        "lng":-74.2620919
                    },
                    "northeast":{
                        "lat":40.8495342,
                        "lng":-73.7498543
                    }
                },
                "bounds":{
                    "southwest":{
                        "lat":"40.4773990",
                        "lng":"-74.2590900"
                    },
                    "northeast":{
                        "lat":"40.9175770",
                        "lng":"-73.7002720"
                    }
                }
            }
        }
    ]
}

请问有谁知道 C# 中是否有这样的 library 吗？

回答区

• Gurdeep Singh Sidhu：

.NET Core 3 新增了一个 System.Text.Json 类可以帮我实现这样的功能。

 public string PrettyJson(string unPrettyJson)
 {
     var options = new JsonSerializerOptions(){
         WriteIndented = true
     };

     var jsonElement = JsonSerializer.Deserialize<JsonElement>(unPrettyJson);

     return JsonSerializer.Serialize(jsonElement, options);
 }

• Frank Tzanabetis：

你可以使用 Newtonsoft.Json 来实现，在 SerializeObject 的时候带一个枚举参数,参考如下代码：

var x = JsonConvert.SerializeObject(jsonString, Formatting.Indented);

或者用它的 JToken 来实现。

void Main()
{
    //Example 1
    var t = "{\\"x\\":57,\\"y\\":57.0,\\"z\\":\\"Yes\\"}";
    var obj = Newtonsoft.Json.JsonConvert.DeserializeObject(t); 
    var f = Newtonsoft.Json.JsonConvert.SerializeObject(obj, Newtonsoft.Json.Formatting.Indented);
    Console.WriteLine(f);

    //Example 2
    JToken jt = JToken.Parse(t);
    string formatted = jt.ToString(Newtonsoft.Json.Formatting.Indented);
    Console.WriteLine(formatted);

    //Example 2 in one line -
    Console.WriteLine(JToken.Parse(t).ToString(Newtonsoft.Json.Formatting.Indented));
}

点评区

对json进行格式化输出，确实是一个非常好的功能，在以前我可能还需要copy到 json.cn 格式化一下，要知道 json.cn 是要上传数据的，有一定的潜在风险，现在方便多了！