Newtonsoft.Json 转换DateTime类型为字符串时，串内部会有一个T。解决方案

Posted 2020-09-22 nlh774

使用Newtonsoft.Json 转换DateTime类型时，若使用标准转换，则字符串内会有一个T（虽然再转换成DateTime没有问题）。

若要转换成DateTime没有T，可以加上特性：

 1 public class TestClass 
 2     {
 3         public TestClass()
 4         {
 5             Dt1 = Dt2 = new DateTime(1900, 1, 1, 0, 0, 0);
 6         }
 7 
 8         [JsonConverter(typeof(TcDateTimeConverter))]
 9         public DateTime Dt1 { get; set; }
10 
11         public DateTime Dt2 { get; set; }
12     }
13 
14 
15 
16  /// <summary>
17     /// DateTime Json序列化格式：yyyy-MM-dd HH:mm:ss
18     /// </summary>
19     public class TcFullDateTimeConverter : DateTimeConverterBase
20     {
21         private static IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" };
22 
23         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
24         {
25             return dtConverter.ReadJson(reader, objectType, ConvertHelper.ToDateTime(existingValue), serializer);
26         }
27 
28         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
29         {
30             dtConverter.WriteJson(writer, ConvertHelper.ToDateTime(value), serializer);
31         }
32     }
33 
34     /// <summary>
35     /// DateTime Json序列化格式：yyyy-MM-dd HH:mm
36     /// </summary>
37     public class TcDateTimeConverter : DateTimeConverterBase
38     {
39         private static IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd HH:mm" };
40 
41         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
42         {
43             return dtConverter.ReadJson(reader, objectType, ConvertHelper.ToDateTime(existingValue), serializer);
44         }
45 
46         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
47         {
48             dtConverter.WriteJson(writer, ConvertHelper.ToDateTime(value), serializer);
49         }
50     }
51 
52     /// <summary>
53     /// DateTime Json序列化格式：yyyy-MM-dd
54     /// </summary>
55     public class TcDateConverter : DateTimeConverterBase
56     {
57         private static IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd" };
58 
59         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
60         {
61             return dtConverter.ReadJson(reader, objectType, ConvertHelper.ToDateTime(existingValue), serializer);
62         }
63 
64         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
65         {
66             dtConverter.WriteJson(writer, ConvertHelper.ToDateTime(value), serializer);
67         }
68     }
69 
70     /// <summary>
71     /// DateTime Json序列化格式：HH:mm
72     /// </summary>
73     public class TcTimeConverter : DateTimeConverterBase
74     {
75         private static IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "HH:mm" };
76 
77         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
78         {
79             return dtConverter.ReadJson(reader, objectType, ConvertHelper.ToDateTime(existingValue), serializer);
80         }
81 
82         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
83         {
84             dtConverter.WriteJson(writer, ConvertHelper.ToDateTime(value), serializer);
85         }
86     }

View Code

另外，若某字段如上加上TcDateTimeConverter，再转换为带TcDateTimeConverter特性或者不带该特性的标准DateTime，都没有问题。