asp.net – 使用json仅序列化对象的一部分

发布时间：2020-12-16 00:10:19 所属栏目：asp.Net 来源：网络整理

导读：我有一个名为MyObject的对象,它有几个属性. MyList是MyObject的列表,我使用linq查询填充,然后将MyList序列化为json.我最终得到这样的东西 ListMyObject MyList = new ListMyObject(); MyList = TheLinqQuery(TheParam); var TheJson = new System.Web.Script

我有一个名为MyObject的对象,它有几个属性. MyList是MyObject的列表,我使用linq查询填充,然后将MyList序列化为json.我最终得到这样的东西

List<MyObject> MyList = new List<MyObject>();

    MyList = TheLinqQuery(TheParam);

    var TheJson = new System.Web.Script.Serialization.JavaScriptSerializer();
    string MyJson = TheJson.Serialize(MyList);

我想要做的是仅序列化MyObject的一部分.例如,我可能有Property1,Property2 …… Propertyn,我希望MyJson只包含Property3,Property5和Property8.

我想到了一种方法,通过创建一个只有我想要的属性的新对象,然后从那里创建一个新的序列化列表.这是最好的方式还是有更好/更快的方式？

谢谢.

解决方法

// simple dummy object just showing what "MyObject" could potentially be
public class MyObject
{
    public String Property1;
    public String Property2;
    public String Property3;
    public String Property4;
    public String Property5;
    public String Property6;
}

// custom converter that tells the serializer what to do when it sees one of
// the "MyObject" types. Use our custom method instead of reflection and just
// dumping properties.
public class MyObjectConverter : JavaScriptConverter
{
    public override object Deserialize(IDictionary<string,object> dictionary,Type type,JavaScriptSerializer serializer)
    {
        throw new ApplicationException("Serializable only");
    }

    public override IDictionary<string,object> Serialize(object obj,JavaScriptSerializer serializer)
    {
        // create a variable we can push the serailized results to
        Dictionary<string,object> result = new Dictionary<string,object>();

        // grab the instance of the object
        MyObject myobj = obj as MyObject;
        if (myobj != null)
        {
            // only serailize the properties we want
            result.Add("Property1",myobj.Property1);
            result.Add("Property3",myobj.Property3);
            result.Add("Property5",myobj.Property5);
        }

        // return those results
        return result;
    }

    public override IEnumerable<Type> SupportedTypes
    {
        // let the serializer know we can accept your "MyObject" type.
        get { return new Type[] { typeof(MyObject) }; }
    }
}

然后你在哪里序列化：

// create an instance of the serializer
JavaScriptSerializer serializer = new JavaScriptSerializer();
// register our new converter so the serializer knows how to handle our custom object
serializer.RegisterConverters(new JavaScriptConverter[] { new MyObjectConverter() });
// and get the results
String result = serializer.Serialize(MyObjectInstance);

（编辑：李大同）

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