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"Newtonsoft.Json.JsonSerializationException cannot find a constructor to use for types" error while deserializing class

I am developing an application in Xamarin

Android. I have a splash screen where I serialize a class and pass it MainActivity

using Intent

. When I try to deserialize it in MainActivity

, I get an error:

"SerializationException unable to find constructor to use for types"

Serialization:

void LoadData() {
    Currency currency = new Currency(this);
    intent = new Intent(this, typeof(MainActivity));
    intent.PutExtra("currency", Newtonsoft.Json.JsonConvert.SerializeObject(currency));
    StartActivity(intent);
}

Deserialization:

cur = Newtonsoft.Json.JsonConvert.DeserializeObject<Currency> (Intent.GetStringExtra("currency")); // I get the error here

Class constructor:

public Currency(Context context) {
    thiscontext = context;
}

I started experiencing this issue after adding a parameter Context context

to the constructor. What caused this? How can I solve this? Is it possible to serialize / deserialize a class with parameters?

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2 answers


To deserialize it, you need to have an empty constructor in the Currency class.



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One more thing can cause this problem if you have full reference included in your Android project. you need to keep the class and members using



[Runtime.Preserve(AllMembers = true)]
public class Currency
{}
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