我要评论目录
1、entity to json
1.1、准备工作
我们以如下的 person 类举例，其中包含了常用的数据类型：
public class person
{
public int id { get; set; }
public string name { get; set; }
public datetime birthday { get; set; }
public bool isvip { get; set; }
public float account { get; set; }
public string[] favorites { get; set; }
public string remark { get; set; }
}
创建一个 person 实例：
person person = new person
{
id = 1,
name = "张三",
birthday = datetime.parse("2000-01-02"),
isvip = true,
account = 12.34f,
favorites = new string[] { "吃饭", "睡觉" }
};
1.2、entity to json
返回不缩进的 json 字符串
jsonconvert.serializeobject(person)
返回：
{"id":1,"name":"张三","birthday":"2000-01-02t00:00:00","isvip":true,"account":12.34,"favorites":["吃饭","睡觉"],"remark":null}
返回缩进的 json 字符串
jsonconvert.serializeobject(person, formatting.indented);
返回：
{
"id": 1,
"name": "张三",
"birthday": "2000-01-02t00:00:00",
"isvip": true,
"account": 12.34,
"favorites": [
"吃饭",
"睡觉"
],
"remark": null
}
json 字符串缩进
private string jsonindentation(string str)
{
//string str = jsonconvert.serializeobject(entity);
jsonserializer serializer = new jsonserializer();
textreader tr = new stringreader(str);
jsontextreader jtr = new jsontextreader(tr);
object obj = serializer.deserialize(jtr);
if (obj != null)
{
stringwriter textwriter = new stringwriter();
jsontextwriter jsonwriter = new jsontextwriter(textwriter)
{
formatting = formatting.indented,
indentation = 4,
indentchar = ' '
};
serializer.serialize(jsonwriter, obj);
return textwriter.tostring();
}
else
{
return str;
}
}
或者：
private string jsonindentation(string json)
{
jobject obj = jobject.parse(json);
return obj.tostring();
}
其他设置
jsonserializersettings settings = new jsonserializersettings(); // 设置日期格式 settings.dateformatstring = "yyyy-mm-dd"; // 忽略空值 settings.nullvaluehandling = nullvaluehandling.ignore; // 缩进 settings.formatting = formatting.indented; jsonconvert.serializeobject(person, settings);
返回：
{
"id": 1,
"name": "张三",
"birthday": "2000-01-02",
"isvip": true,
"account": 12.34,
"favorites": [
"吃饭",
"睡觉"
]
}
1.3、json to entity
jsonconvert.deserializeobject<person>(json);
2、linq to json
2.1、创建对象
jobject obj = new jobject();
obj.add("id", 1);
obj.add("name", "张三");
obj.add("birthday", datetime.parse("2000-01-02"));
obj.add("isvip", true);
obj.add("account", 12.34f);
// 创建数组
jarray array = new jarray();
array.add(new jvalue("吃饭"));
array.add(new jvalue("睡觉"));
obj.add("favorites", array);
obj.add("remark", null);
2.2、从 json 字符串创建 jobject
string json = "{\"id\":1,\"name\":\"张三\",\"birthday\":\"2000-01-02t00:00:00\",\"isvip\":true,\"account\":12.34,\"favorites\":[\"吃饭\",\"睡觉\"],\"remark\":null}";
jobject obj = jobject.parse(json);
2.3、从 entity 创建 jobject
jobject obj = jobject.fromobject(person);
用匿名对象创建 jobject
jobject obj = jobject.fromobject(new { name = "jack", age = 18 });
显示：
{
"name": "jack",
"age": 18
}
2.2、获取值
int id;
if (obj["id"] != null)
id = obj["id"].value<int>();
获取数组
newtonsoft.json.linq 不支持直接获取数组，但是可以获取 list，然后再转化为数组。
string[] favorites;
if (obj["favorites"] != null)
favorites = obj["favorites"].value<list<string>>().toarray();
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