在转换为json时，如何格式化对象中只有字符串的属性? [英] How to format properties that are only string in an object while converting to json?

问题描述

实例类型不清楚.我以 Foo 为例. 我有一个格式化方法和一个类似下面的类，

The intance type is not clear. I am using Foo as example. I have a format method and a class like below,

public string FormatMethod(string s){
    //for example pattern ++
    return "++" + s + "++"; 
}

public class Foo{
    public int FooId {get;set;}
    public string Name {get;set;}
    public string Desciption {get;set;}
}

var foo = new Foo{ FooId = 1, Name = "FooName", Description = "Bla bla bla" };
// or
var list = new List<Foo>();
list.Add(foo);

var json = JsonConvert.SerializeObject(list);
//or
var jsonlist = JsonConvert.SerializeObject(foo);

我希望将对象或列表中字符串形式的属性在转换为json时发送给format方法，

I would like the properties that are string in an object or in a list to send to the format method while converting to json,

我希望json结果如下所示，

I would like json result to be like below,

json结果

 {"FooId": 1 , "Name": "++FooName++", "Description" : "++Bla bla bla++" }

或作为列表

[{"FooId": 1 , "Name": "++FooName++", "Description" : "++Bla bla bla++" }]

我该怎么办?

编辑:

例如，我想在对象被序列化时应用任何模式 名称为"FooName"，序列化后必须为"++ FooName ++".

I would like to apply any pattern while the object being serilalized, for example The name that is 'FooName', it need to be '++FooName++' after serialize.

我认为可以使用myconverter来完成，但是怎么办呢?

I think it can be done using myconverter, but how ?

例如:

public class MyConverter : JsonConverter
    {
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            // need to do something in here, I don't know what to do.
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            throw new NotImplementedException();
        }

        public override bool CanConvert(Type objectType)
        {
            throw new NotImplementedException();
        }
    } 

推荐答案

转换器:

class StringFormatConverter : JsonConverter
{
    public string Format { get; set; }

    public override void WriteJson (JsonWriter writer, object value, JsonSerializer serializer)
    {
        writer.WriteValue(string.Format(Format, value));
    }

    public override object ReadJson (JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotSupportedException();
    }

    public override bool CanConvert (Type objectType)
    {
        return objectType == typeof(string);
    }
}

用法:

Console.WriteLine(JsonConvert.SerializeObject(new List<Foo> {
    new Foo { FooId = 1, Name = "FooName", Description = "Bla bla bla" }
}, new JsonSerializerSettings {
    Converters = { new StringFormatConverter { Format = "++{0}++" } }
}));

输出:

[{"FooId":1,"Name":"++FooName++","Description":"++Bla bla bla++"}]

如果需要将字符串修改限制为特定属性，则可以使用JsonConverterAttribute和JsonPropertyAttribute.ItemConverterType(并从JsonSerializerSettings中删除全局"转换器).

If you need to limit string modification to specific properties, you can use JsonConverterAttribute and JsonPropertyAttribute.ItemConverterType (and remove "global" converter from JsonSerializerSettings).

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