Each parameter in the deserialization constructor on type 'SpeechCreatedEvent' must bind to an object property or field on deserialization. Each parameter name must match with a property or field on the object. The match can be case-insensitive.'

[logcorner]

Hi I'm migrating from newtonsoft.json to System.Text.Json using .NET6 I have an issues when deserializing json string into object.

The error message is Each parameter in the deserialization constructor on type 'SpeechCreatedEvent' must bind to an object property or field on deserialization. Each parameter name must match with a property or field on the object. The match can be case-insensitive.'

You can find the sample code in the following repository https://github.com/logcorner/DotNetJsonSerilizer

It works fine with newtonsoft.json but raise an exception when using System.Text.Json

 JsonSerializerOptions settings = new JsonSerializerOptions
            {
                IncludeFields = true
            };
            var result = (TEvent)JsonSerializer.Deserialize(serializedEvent, Type.GetType(eventType), settings);`

With Newtonsoft.Json I have implemented a DefaultContractResolver as following

private class PrivateSetterContractResolver : DefaultContractResolver
        {
            protected override JsonProperty CreateProperty(
                MemberInfo member,
                MemberSerialization memberSerialization)
            {
                var prop = base.CreateProperty(member, memberSerialization);
                if (!prop.Writable)
                {
                    var property = member as PropertyInfo;
                    if (property != null)
                    {
                        var hasPrivateSetter = property.GetSetMethod(true) != null;
                        prop.Writable = hasPrivateSetter;
                    }
                }
                return prop;
            }
        }

Do I need to implement a JsonConverter with System.Text.Json ?
Regards

Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Hi I'm migrating from newtonsoft.json to System.Text.Json using .NET6 I have an issues when deserializing json string into object.

The error message is Each parameter in the deserialization constructor on type 'SpeechCreatedEvent' must bind to an object property or field on deserialization. Each parameter name must match with a property or field on the object. The match can be case-insensitive.'

You can find the sample code in the following repository https://github.com/logcorner/DotNetJsonSerilizer

It works fine with newtonsoft.json but raise an exception when using System.Text.Json
JsonSerializerOptions settings = new JsonSerializerOptions { IncludeFields = true }; var result = (TEvent)JsonSerializer.Deserialize(serializedEvent, Type.GetType(eventType), settings);

With Newtonsoft.Json I have implemented a DefaultContractResolver as following
private class PrivateSetterContractResolver : DefaultContractResolver { protected override JsonProperty CreateProperty( MemberInfo member, MemberSerialization memberSerialization) { var prop = base.CreateProperty(member, memberSerialization); if (!prop.Writable) { var property = member as PropertyInfo; if (property != null) { var hasPrivateSetter = property.GetSetMethod(true) != null; prop.Writable = hasPrivateSetter; } } return prop; } }

Do I need to implement a JsonConverter with System.Text.Json ?
Regards

Author:	logcorner
Assignees:	-
Labels:	area-System.Text.Json, untriaged
Milestone:	-

[eiriktsarpalis]

Hi, we plan to support custom contract resolution in .NET 7 via #63686. Until then, it won't be possible to modify the list of serializable properties I'm afraid.

Duplicate of #63686

[logcorner]

So I'm suspending the migration for now.

I can't use System.Text.Json if I can't deserialize complex types like private setters or inherited properties

I would like this feature to be implemented soon
Regard

[danmoseley]

#43563