public static void CustomHashCode()
{
// Test that POCO's implementation of GetHashCode is always used.
ClassIncorrectHashCode elem = new ClassIncorrectHashCode();
List <ClassIncorrectHashCode> list = new List <ClassIncorrectHashCode>()
{
elem,
elem,
};
string json = JsonSerializer.Serialize(list, s_serializerOptionsPreserve);
Assert.Equal(@"{""$id"":""1"",""$values"":[{""$id"":""2""},{""$id"":""3""}]}", json);
List <ClassIncorrectHashCode> listCopy = JsonSerializer.Deserialize <List <ClassIncorrectHashCode> >(json, s_serializerOptionsPreserve);
// When a GetHashCode method is implemented incorrectly, round-tripping breaks,
// that is a user error and this validates that we are always calling user's GetHashCode.
Assert.NotSame(listCopy[0], listCopy[1]);
}
public async Task CustomHashCode()
{
// Test that POCO's implementation of GetHashCode is always used.
ClassIncorrectHashCode elem = new ClassIncorrectHashCode();
List <ClassIncorrectHashCode> list = new List <ClassIncorrectHashCode>()
{
elem,
elem,
};
string json = await JsonSerializerWrapperForString.SerializeWrapper(list, s_serializerOptionsPreserve);
Assert.Equal(@"{""$id"":""1"",""$values"":[{""$id"":""2""},{""$ref"":""2""}]}", json);
List <ClassIncorrectHashCode> listCopy = await JsonSerializerWrapperForString.DeserializeWrapper <List <ClassIncorrectHashCode> >(json, s_serializerOptionsPreserve);
// Make sure that our DefaultReferenceResolver calls the ReferenceEqualityComparer that implements RuntimeHelpers.GetHashCode, and never object.GetHashCode,
// otherwise objects would not be correctly identified when searching for them in the dictionary.
Assert.Same(listCopy[0], listCopy[1]);
}
