使用Source Generation方式以避免使用反射，可以AOT兼容。
Reference: https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/source-generation
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using System.Text.Json; using System.Text.Json.Serialization; namespace MetadataOnlyNoOptions { public class WeatherForecast { public DateTime Date { get; set; } public int TemperatureCelsius { get; set; } public string? Summary { get; set; } } [JsonSerializable(typeof(WeatherForecast), GenerationMode = JsonSourceGenerationMode.Metadata)] internal partial class MetadataOnlyWeatherForecastOnlyContext : JsonSerializerContext { } [JsonSourceGenerationOptions(GenerationMode = JsonSourceGenerationMode.Metadata)] [JsonSerializable(typeof(WeatherForecast))] internal partial class MetadataOnlyContext : JsonSerializerContext { } public class Program { public static void Main() { string jsonString = @"{ ""Date"": ""2019-08-01T00:00:00"", ""TemperatureCelsius"": 25, ""Summary"": ""Hot"" } "; WeatherForecast? weatherForecast; // Deserialize with context that selects metadata mode only for WeatherForecast only. weatherForecast = JsonSerializer.Deserialize<WeatherForecast>( jsonString, MetadataOnlyWeatherForecastOnlyContext.Default.WeatherForecast); Console.WriteLine($"Date={weatherForecast?.Date}"); // output: //Date=8/1/2019 12:00:00 AM // Serialize with context that selects metadata mode only for WeatherForecast only. jsonString = JsonSerializer.Serialize( weatherForecast!, MetadataOnlyWeatherForecastOnlyContext.Default.WeatherForecast); Console.WriteLine(jsonString); // output: //{"Date":"2019-08-01T00:00:00","TemperatureCelsius":25,"Summary":"Hot"} // Deserialize with context that selects metadata mode only. weatherForecast = JsonSerializer.Deserialize<WeatherForecast>( jsonString, MetadataOnlyContext.Default.WeatherForecast); Console.WriteLine($"Date={weatherForecast?.Date}"); // output: //Date=8/1/2019 12:00:00 AM // Serialize with context that selects metadata mode only. jsonString = JsonSerializer.Serialize( weatherForecast!, MetadataOnlyContext.Default.WeatherForecast); Console.WriteLine(jsonString); // output: //{"Date":"2019-08-01T00:00:00","TemperatureCelsius":0,"Summary":"Hot"} } } } |
