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JavaScriptSerializer中日期序列化问题解决方案
JavaScriptSerializer中日期序列化问题解决方案
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。
------------------- 繁星小宋：宋兴柱(Sindrol)于2014-06-30：11：31分
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