Use System.Text.Json to deserialize properties with private setters in C#

Use System.Text.Json to deserialize properties with private setters in C#

By default, System.Text.Json does not support deserializing properties with private setters. To enable deserialization of private properties, you can configure the JsonSerializerOptions with the PropertyVisibilityConverter:

var options = new JsonSerializerOptions(); options.Converters.Add(new PropertyVisibilityConverter(true)); var obj = JsonSerializer.Deserialize<MyClass>(jsonString, options);

Here, PropertyVisibilityConverter is a custom converter that converts the visibility of object properties during serialization and deserialization. By passing true as the constructor argument, it allows the deserialization of private properties.

public class PropertyVisibilityConverter : JsonConverter { private readonly bool _includeNonPublic; public PropertyVisibilityConverter(bool includeNonPublic) { _includeNonPublic = includeNonPublic; } public override bool CanConvert(Type objectType) { return objectType.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance) .Any(p => p.GetSetMethod(_includeNonPublic) != null); } public override object Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) { var obj = Activator.CreateInstance(typeToConvert); while (reader.Read()) { if (reader.TokenType == JsonTokenType.EndObject) { return obj; } if (reader.TokenType == JsonTokenType.PropertyName) { var propertyName = reader.GetString(); var property = typeToConvert.GetProperty(propertyName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); if (property != null && property.GetSetMethod(_includeNonPublic) != null) { var value = JsonSerializer.Deserialize(ref reader, property.PropertyType, options); property.SetValue(obj, value); } else { reader.Skip(); } } } throw new JsonException(); } public override void Write(Utf8JsonWriter writer, object value, JsonSerializerOptions options) { throw new NotImplementedException(); } }

This converter checks whether a property can be set (i.e., has a setter method) before deserializing its value. Note that the converter does not allow serialization of private properties.

Examples

  1. "Deserialize private setters using System.Text.Json C#"

    • Description: Find out how to use System.Text.Json to deserialize properties with private setters in C#.
    public class MyClass { public string PublicProperty { get; private set; } [JsonConstructor] private MyClass() { } public static MyClass Create(string value) { return new MyClass { PublicProperty = value }; } }

  2. "System.Text.Json private setters attribute"

    • Description: Explore attributes or settings in System.Text.Json that allow deserialization of properties with private setters.
    public class MyClass { [JsonInclude] public string PublicProperty { get; private set; } // Constructor and other methods... }

  3. "C# System.Text.Json deserialize private setter readonly property"

    • Description: Learn how to deserialize properties with private setters and readonly properties using System.Text.Json in C#.
    public class MyClass { public string PublicProperty { get; private set; } public string ReadOnlyProperty { get; } [JsonConstructor] private MyClass(string publicProperty, string readOnlyProperty) { PublicProperty = publicProperty; ReadOnlyProperty = readOnlyProperty; } }

  4. "System.Text.Json JsonConverter private setters"

    • Description: Investigate the usage of custom JsonConverter to handle deserialization of properties with private setters in System.Text.Json.
    public class MyClass { public string PublicProperty { get; private set; } // Constructor and other methods... [JsonConverter(typeof(MyClassConverter))] private class MyClassConverter : JsonConverter<MyClass> { // Implementation of Read method for custom deserialization... } }

  5. "C# System.Text.Json deserialize private setters with default constructor"

    • Description: Explore ways to deserialize private setters using System.Text.Json without a parameterless constructor.
    public class MyClass { public string PublicProperty { get; private set; } [JsonConstructor] private MyClass(string publicProperty) { PublicProperty = publicProperty; } }

  6. "System.Text.Json deserialize private setters ignore readonly"

    • Description: Find information on ignoring readonly properties during deserialization of private setters using System.Text.Json in C#.
    public class MyClass { public string PublicProperty { get; private set; } public string ReadOnlyProperty { get; } [JsonConstructor] private MyClass(string publicProperty) { PublicProperty = publicProperty; ReadOnlyProperty = "Default value"; } }

  7. "C# System.Text.Json deserialize private setters nullable properties"

    • Description: Learn how to handle deserialization of properties with private setters and nullable types using System.Text.Json.
    public class MyClass { public string? PublicProperty { get; private set; } [JsonConstructor] private MyClass(string? publicProperty) { PublicProperty = publicProperty; } }

  8. "System.Text.Json deserialize private setters with attributes"

    • Description: Explore the use of specific attributes or settings in System.Text.Json to facilitate deserialization of properties with private setters.
    public class MyClass { [JsonInclude] public string PublicProperty { get; private set; } // Constructor and other methods... }

  9. "C# System.Text.Json deserialize private setters dynamic types"

    • Description: Learn how to handle deserialization of properties with private setters in dynamic types using System.Text.Json.
    public class DynamicClass { public dynamic PublicProperty { get; private set; } [JsonConstructor] private DynamicClass(dynamic publicProperty) { PublicProperty = publicProperty; } }

  10. "System.Text.Json deserialize private setters with custom naming policy"

    • Description: Investigate using custom naming policies in System.Text.Json to deserialize properties with private setters with different naming conventions.
    public class MyClass { [JsonPropertyName("publicProperty")] public string PublicProperty { get; private set; } // Constructor and other methods... }

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