我有一个对象，它有一个DateTime属性…我想将该对象从.ashx处理程序通过AJAX / JSON传递到一个网页…我不想使用第三方控件…
当我这样做：
new JavaScriptSerializer().Serialize(DateTime.Now);
我得到这个：
"\/Date(1251385232334)\/"
但是我想要“8/26/2009”(不管本地化…我的应用程序是非常本地化的，所以我的日期格式化假设不是在这个问题上辩论)。如果我注册一个自定义转换器
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;
}
}
那么我得到这个结果(由于自定义serialize方法的返回值是字典)：
{"DateTime":"8/27/2009"}
所以现在在我的Javascript，而不是做
somePerson.Birthday
我要做
somePerson.Birthday.DateTime or somePerson.Birthday["DateTime"]
如何使自定义转换器返回一个直接的字符串，以便我可以有干净的Javascript？
JavaScriptSerializer绝对可以做你想要的。
可以通过创建自定义转换器并将其注册到序列化程序来定制JavaScriptSerializer对任何类型执行的序列化。如果你有一个类叫做Person，我们可以创建一个如下的转换器：
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,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,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;
}
}
并使用它像这样：
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