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  1. using System;
  2. using System.Text.Json;
  3. using System.Text.Json.Serialization;
  4.  
  5.  
  6. public class EntradaDiario {
  7. 	public /*required*/ DateOnly Fecha { get; init; }
  8. 	public /*required*/ string Texto { get; init; }
  9.  
  10. 	public override string ToString()
  11. 	{
  12. 		return $"{this.Fecha}: {this.Texto}";
  13. 	}
  14. }
  15.  
  16.  
  17. class EntradaDiarioConverter: JsonConverter<EntradaDiario> {
  18. 	public override EntradaDiario? Read(
  19.             ref Utf8JsonReader reader,
  20.             Type typeToConvert,
  21.             JsonSerializerOptions options)
  22.     {
  23.     	string texto = "";
  24.     	DateOnly? fecha = null;
  25.     	EntradaDiario? toret = null;
  26.  
  27.     	while ( reader.Read() ) {
  28.         	var tokenType = reader.TokenType;
  29.  
  30. 			if ( tokenType == JsonTokenType.PropertyName
  31. 			  && reader.ValueTextEquals( "fecha" ) )
  32. 			{
  33. 				reader.Read();
  34. 				fecha = DateOnly.ParseExact(
  35. 								reader.GetString() ?? "",
  36. 								new []{ "yyyy-MM-dd" } );
  37. 			}
  38. 			if ( tokenType == JsonTokenType.PropertyName
  39. 			  && reader.ValueTextEquals( "texto" ) )
  40. 			{
  41. 				reader.Read();
  42. 				texto = reader.GetString() ?? "";
  43. 			}
  44. 		}
  45.  
  46. 		if ( fecha != null ) {
  47. 			toret = new EntradaDiario{ Fecha = (DateOnly) fecha, Texto = texto };
  48. 		}
  49.  
  50. 		return toret;
  51.     }
  52.  
  53.     public override void Write(
  54.             Utf8JsonWriter writer,
  55.             EntradaDiario entrada,
  56.             JsonSerializerOptions options)
  57.     {
  58. 	    writer.WriteStartObject();
  59.     	writer.WriteString( "fecha",
  60.     		$"{entrada.Fecha.Year, 4:D4}-{entrada.Fecha.Month, 2:D2}-{entrada.Fecha.Day, 2:D2}" );
  61.     	writer.WriteString( "texto", entrada.Texto );
  62. 	    writer.WriteEndObject();
  63.     }
  64. }
  65.  
  66.  
  67. class Test {
  68. 	static void Main()
  69. 	{
  70. 		var e1 = new EntradaDiario{
  71. 						Fecha = DateOnly.FromDateTime( DateTime.Now ),
  72. 						Texto = "Prueba" };
  73.  
  74. 		Console.WriteLine( e1 );
  75.  
  76. 		Console.WriteLine( "Escribiendo JSON..." );
  77. 		using ( var f = File.Create( "entrada.json" ) ) {
  78. 			var opts = new JsonSerializerOptions();
  79. 			opts.Converters.Add( new EntradaDiarioConverter() );
  80. 			JsonSerializer.Serialize( f, e1, opts );
  81. 		}
  82.  
  83. 		Console.WriteLine( "Leyendo JSON..." );
  84. 		using ( var f = File.OpenRead( "entrada.json" ) ) {
  85. 			var opts = new JsonSerializerOptions();
  86. 			opts.Converters.Add( new EntradaDiarioConverter() );
  87. 			System.Console.WriteLine(
  88. 				JsonSerializer.Deserialize<EntradaDiario>( f, opts ) );
  89. 		}
  90. 	}
  91. }
  92.  
Success #stdin #stdout 0.12s 38076KB
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12/3/2024: Prueba
Escribiendo JSON...
Leyendo JSON...
12/3/2024: Prueba
https://ideone.com/4DZ8xt
C# using JsonConverter for the JSON API.
language:
C# (NET 6.0)
created:
1 day ago
visibility:
public

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