Question

intance类型不清楚。我使用 Foo 作为示例。我有一个格式方法和类如下，

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);

我想在转换为json时将对象或列表中的字符串属性发送到format方法，

我希望json的结果如下所示，

json结果

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

或作为清单

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

我该怎么办？

修改：

例如，我希望在被处理的对象时应用任何模式名称为'FooName'，序列化后需要为'++ FooName ++'。

我认为可以使用myconverter完成，但是如何？

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();
        }
    }

Answer 1

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++"}]

如果您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删除“全局”转换器。）

Answer 2

执行此操作的正确方法可能是

反序列化
做你的搅拌操作
重新序列

喜欢这样

// build initial Json
var foo = new Foo { FooId = 1, Name = "FooName", Desciption = "Bla bla bla" };
JavaScriptSerializer json_serializer = new JavaScriptSerializer();
string fooJson = json_serializer.Serialize(foo);

// change value in Json
Foo newFoo = json_serializer.Deserialize<Foo>(fooJson);
newFoo.Name = String.Format("++{0}++", newFoo.Name);
fooJson = json_serializer.Serialize(newFoo);

或者你可能在转换为json之前尝试格式化你的字符串

Foo foo = new Foo { FooId = 1, Name = "FooName", Desciption = "Bla bla bla" };

Foo formattedFoo = new Foo { 
                             FooId = foo.FooId, 
                             Name = String.Format("++{0}++", foo.Name), 
                             Desciption = String.Format("++{0}++", foo.Desciption) 
                           };

JavaScriptSerializer json_serializer = new JavaScriptSerializer();
string fooJson = json_serializer.Serialize(formattedFoo);

如何在转换为json时格式化对象中只有字符串的属性？

2 个答案: