NewtonSoft add JSONIGNORE at runTime

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No need to do the complicated stuff explained in the other answer.

NewtonSoft JSON has a built-in feature for that:

public bool ShouldSerializeINSERT_YOUR_PROPERTY_NAME_HERE()
{
    if(someCondition){
        return true;
    }else{
        return false;
    }
}

It is called “conditional property serialization” and the documentation can be found here.

Warning: first of all, it is important to get rid of [JsonIgnore] above your {get;set;} property. Otherwise it will overwrite the ShouldSerializeXYZ behavior.

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