[转]JavaScriptSerializer中日期序列化

本文转自：http://www.cnblogs.com/songxingzhu/p/3816309.html

直接进入主题：

class Student
    {
        public int age { get; set; }
        public DateTime? date { get; set; }
        public string name { get; set; }
    }

当点击的时候：

   private void button1_Click(object sender, EventArgs e)
        {
            System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();
            List<Student> list = new List<Student>();
            list.Add(new Student()
            {
                age = 10,
                date = DateTime.Now,
                name = "宋兴柱  是个好孩\"子,这里\"有英文逗号"
            });
            //js.RegisterConverters(new JavaScriptConverter[] { new DateTimeConverter() });
            var str = js.Serialize(list);
            //str = Regex.Replace(str, @"\\/Date\((\d+)\)\\/", match =>
            //{
            //    DateTime dt = new DateTime(1970, 1, 1);
            //    dt = dt.AddMilliseconds(long.Parse(match.Groups[1].Value));
            //    dt = dt.ToLocalTime();
            //    return dt.ToString("yyyy-MM-dd HH:mm:ss");
            //});
            //var obj = js.Deserialize<List<Student>>(str);
            textBox1.Text = str;
        }

这个时候，显示如下内容：[{"age":10,"date":"\/Date(1404098342309)\/","name":"宋兴柱  是个好孩\"子,这里\"有英文逗号"}]

显然，这里的DateTime 类型被替换成了：\/Date(1404098342309)\/，经过分析，其实这个1404098342309数值，是1970年1月1日（DateTime的最小值）到date实际表示的日期之差的总毫秒数。

因此，这里提供2种解决方案。

方案1 ：

  private void button1_Click(object sender, EventArgs e)
        {
            System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();
            List<Student> list = new List<Student>();
            list.Add(new Student()
            {
                age = 10,
                date = DateTime.Now,
                name = "宋兴柱  是个好孩\"子,这里\"有英文逗号"
            });
            //js.RegisterConverters(new JavaScriptConverter[] { new DateTimeConverter() });
            var str = js.Serialize(list);
            str = Regex.Replace(str, @"\\/Date\((\d+)\)\\/", match =>
            {
                DateTime dt = new DateTime(1970, 1, 1);
                dt = dt.AddMilliseconds(long.Parse(match.Groups[1].Value));
                dt = dt.ToLocalTime();
                return dt.ToString("yyyy-MM-dd HH:mm:ss");
            });
            //var obj = js.Deserialize<List<Student>>(str);
            textBox1.Text = str;
        }

显示结果：[{"age":10,"date":"2014-06-30 11:22:15","name":"宋兴柱  是个好孩\"子,这里\"有英文逗号"}]
当取消var obj = js.Deserialize<List<Student>>(str);的注释之后，会发现反序列化也完全正常。因此，这算是当前的最佳方案。

方案2 ：

如果用户的日期需求中，只用到年月日，无需时分秒的情况下：如，2014-06-30 时，可以使用如下方案：

 public class DateTimeConverter : JavaScriptConverter
    {

        public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
        {

            return new JavaScriptSerializer().ConvertToType(dictionary, type);

        }

        public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
        {

            if (!(obj is DateTime)) return null;
            return new CustomString(((DateTime)obj).ToString("yyyy-MM-dd"));
        }

        public override IEnumerable<Type> SupportedTypes
        {

            get
            {
                return new[] { typeof(DateTime) };
            }

        }

        private class CustomString : Uri, IDictionary<string, object>
        {
            public CustomString(string str)
                : base(str, UriKind.Relative)
            {

            }

            void IDictionary<string, object>.Add(string key, object value)
            {

                throw new NotImplementedException();

            }

            bool IDictionary<string, object>.ContainsKey(string key)
            {

                throw new NotImplementedException();

            }

            ICollection<string> IDictionary<string, object>.Keys
            {

                get
                {
                    throw new NotImplementedException();
                }

            }

            bool IDictionary<string, object>.Remove(string key)
            {

                throw new NotImplementedException();

            }

            bool IDictionary<string, object>.TryGetValue(string key, out object value)
            {

                throw new NotImplementedException();

            }

            ICollection<object> IDictionary<string, object>.Values
            {

                get
                {
                    throw new NotImplementedException();
                }

            }

            object IDictionary<string, object>.this[string key]
            {

                get
                {

                    throw new NotImplementedException();

                }

                set
                {

                    throw new NotImplementedException();

                }

            }

            void ICollection<KeyValuePair<string, object>>.Add(KeyValuePair<string, object> item)
            {

                throw new NotImplementedException();

            }

            void ICollection<KeyValuePair<string, object>>.Clear()
            {

                throw new NotImplementedException();

            }

            bool ICollection<KeyValuePair<string, object>>.Contains(KeyValuePair<string, object> item)
            {

                throw new NotImplementedException();

            }

            void ICollection<KeyValuePair<string, object>>.CopyTo(KeyValuePair<string, object>[] array, int arrayIndex)
            {

                throw new NotImplementedException();

            }

            int ICollection<KeyValuePair<string, object>>.Count
            {

                get
                {
                    throw new NotImplementedException();
                }

            }

            bool ICollection<KeyValuePair<string, object>>.IsReadOnly
            {

                get
                {
                    throw new NotImplementedException();
                }

            }

            bool ICollection<KeyValuePair<string, object>>.Remove(KeyValuePair<string, object> item)
            {

                throw new NotImplementedException();

            }

            IEnumerator<KeyValuePair<string, object>> IEnumerable<KeyValuePair<string, object>>.GetEnumerator()
            {
                throw new NotImplementedException();

            }

            IEnumerator IEnumerable.GetEnumerator()
            {
                throw new NotImplementedException();

            }

        }

点击按钮时，注册即可：

　　　　

 private void button1_Click(object sender, EventArgs e)
        {
            System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();
            List<Student> list = new List<Student>();
            list.Add(new Student()
            {
                age = 10,
                date = DateTime.Now,
                name = "宋兴柱  是个好孩\"子,这里\"有英文逗号"
            });
            js.RegisterConverters(new JavaScriptConverter[] { new DateTimeConverter() });
            var str = js.Serialize(list);
            //str = Regex.Replace(str, @"\\/Date\((\d+)\)\\/", match =>
            //{
            //    DateTime dt = new DateTime(1970, 1, 1);
            //    dt = dt.AddMilliseconds(long.Parse(match.Groups[1].Value));
            //    dt = dt.ToLocalTime();
            //    return dt.ToString("yyyy-MM-dd HH:mm:ss");
            //});
            //var obj = js.Deserialize<List<Student>>(str);
            textBox1.Text = str;
        }

执行效果如下：[{"age":10,"date":"2014-06-30","name":"宋兴柱  是个好孩\"子,这里\"有英文逗号"}]

对于方案二来说，由于内部使用的是Uri类，因此，将日期转为字符串如：2014-06-30 11:30:00这 种样式的时候，中间的空格，会被进行Url编码：空格会被编码成：%20。因此会损坏原有的日期格式。不过方案二对于其它类型的使用，依然有借鉴之处。还忘不断探索。