c# 类实例序列化反序列化json文件 （原发布 csdn 2017-10-01 20:02:12）

前言

前段时间使用了net.json保存对象数据。添加完成后，测试发现300多实例数据保存加载json文件，速度比原方式(binaryformatter)慢。但是功能加上后也懒再删掉代码了，索性就采用两种方式。怎么说两种方式也比一种多不是？^_^

net.json

1 测试之前需要引用newtonsoft.json.dll，可在官网下载最新安装包。本文写作时最新version 10.0.3

测试类student

[jsonobject(memberserialization.fields)]
class student
{
    const int count = 1024;
    public student(int id, string name, int age, string sex)
    {
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;

        buffer = new byte[count];
        for (int i = 0; i < count; i++)
        {
            buffer[i] = (byte)i;
        }
    }
    
    byte[] buffer;

    int id { get; set; }

    string name { get; set; }

    int age { get; set; }

    string sex { get; set; }
    
    [jsonignore]
    intptr hwnd;

    [ondeserialized]
    private void setvaluesondeserialized(streamingcontext context)
    {
        string stringa = "i seem to be turned around!";
        hwnd = system.runtime.interopservices.marshal.stringtohglobalansi(stringa);
    }
}

2 序列化对象默认情况下只有公共成员，此类没有公共成员。故设置特性[jsonobject(memberserialization.fields)]可序列化所有成员。详细可见memberserialization

3 对于intprt hwnd，标记为[jsonignore]表示不进行序列化；当进行反序列化后使用[ondeserialized]可根据需要重新对其进行赋值 ondeserializedattribute 类，对于自定义序列化可参考msdn

测试用例

arraylist stumodel = new arraylist()
{
    new student(1,"王小二",18,"男"),
    new student(2,"丽丽",16,"女")
};

using (streamwriter file = file.createtext(@"test.json"))
{
    jsonserializer serializer = new jsonserializer();
    serializer.serialize(file, stumodel);
}

using (streamreader file = file.opentext(@"test.json"))
{
    jsonserializer serializer = new jsonserializer();
    var movie2 = (arraylist)serializer.deserialize(file, typeof(arraylist));
    for (int i = 0; i < movie2.count; i++)
    {
        movie2[i] = jsonconvert.deserializeobject<student>(movie2[i].tostring());
    }
}

4 测试代码中集合用arraylist，故反序列化后需要再次进行转换，把集合里面的每个jobject转换成student，如果使用list就不需要，如下：

list<student> stumodel = new list<student>()
{
    new student(1,"王小二",18,"男"),
    new student(2,"丽丽",16,"女")
};

using (streamwriter file = file.createtext(@"test.json"))
{
    jsonserializer serializer = new jsonserializer();
    serializer.serialize(file, stumodel);
}

using (streamreader file = file.opentext(@"test.json"))
{
    jsonserializer serializer = new jsonserializer();
    var movie2 = (list<student>)serializer.deserialize(file, typeof(list<student>));
}