小编典典

是否为DateTime自定义JavaScriptConverter?

ajax

我有一个对象,它具有DateTime属性…我想将该对象从.ashx处理程序通过AJAX / JSON传递回网页…我不想使用第三方控件…

当我这样做时:

  new JavaScriptSerializer().Serialize(DateTime.Now);

我得到这个:

  "\/Date(1251385232334)\/"

但是我想输入“
2009年8月26日”(不要介意本地化…我的应用程序非常本地化,因此我的日期格式设置假设不值得在这个问题上进行辩论)。如果我制作/注册自定义转换器

public class DateTimeConverter : JavaScriptConverter
{
    public override IEnumerable<Type> SupportedTypes
    {
        get { return new List<Type>() { typeof(DateTime), typeof(DateTime?) }; }
    }

    public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
    {
        Dictionary<string, object> result = new Dictionary<string, object>();
        if (obj == null) return result;
        result["DateTime"] = ((DateTime)obj).ToShortDateString();
        return result;
    }

    public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
    {
        if (dictionary.ContainsKey("DateTime"))
            return new DateTime(long.Parse(dictionary["DateTime"].ToString()), DateTimeKind.Unspecified);
        return null;
    }
}

然后得到这个结果(因为自定义序列化方法的返回值是一个字典):

{"DateTime":"8/27/2009"}

所以现在在我的Javascript中,而不是

somePerson.Birthday

我要做

somePerson.Birthday.DateTime

  or

somePerson.Birthday["DateTime"]

如何使自定义转换器返回直接字符串,以便可以使用干净的Javascript?


阅读 345

收藏
2020-07-26

共1个答案

小编典典

JavaScriptSerializer绝对可以满足您的需求。

通过创建自定义转换器并将其注册到序列化器中,可以针对任何类型来自定义JavaScriptSerializer执行的序列化。如果您有一个名为Person的类,我们可以这样创建一个转换器:

public class Person
{
    public string Name { get; set; }
    public DateTime Birthday { get; set; }
}

public class PersonConverter : JavaScriptConverter
{
    private const string _dateFormat = "MM/dd/yyyy";

    public override IEnumerable<Type> SupportedTypes
    {
        get
        {
            return new[] { typeof(Person) };
        }
    }

    public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
    {
        Person p = new Person();
        foreach (string key in dictionary.Keys)
        {
            switch (key)
            {
                case "Name":
                    p.Name = (string)dictionary[key];
                    break;

                case "Birthday":
                    p.Birthday = DateTime.ParseExact(dictionary[key] as string, _dateFormat, DateTimeFormatInfo.InvariantInfo);
                    break;
            }
        }
        return p;
    }

    public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
    {
        Person p = (Person)obj;
        IDictionary<string, object> serialized = new Dictionary<string, object>();
        serialized["Name"] = p.Name;
        serialized["Birthday"] = p.Birthday.ToString(_dateFormat);
        return serialized;
    }
}

并像这样使用它:

JavaScriptSerializer serializer = new JavaScriptSerializer();
serializer.RegisterConverters(new[] { new PersonConverter() });

Person p = new Person
            {
                Name = "User Name",
                Birthday = DateTime.Now
            };

string json = serializer.Serialize(p);
Console.WriteLine(json);
// {"Name":"User Name","Birthday":"12/20/2010"}

Person fromJson = serializer.Deserialize<Person>(json);
Console.WriteLine(String.Format("{0}, {1}", fromJson.Name, fromJson.Birthday)); 
// User Name, 12/20/2010 12:00:00 AM
2020-07-26