/// <inheritdoc />
public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
JsonSerializer serializer)
{
if (reader.TokenType == JsonToken.Undefined)
{
// undefined 表示空的 Maybe<T> 实例。直接使用 Activator 实例化即可。
existingValue = Activator.CreateInstance(objectType);
return(existingValue);
}
var valueType = MaybeUtils.GetInnerType(objectType);
var value = serializer.Deserialize(reader, valueType);
if (existingValue != null && MaybeUtils.IsMaybe(existingValue))
{
MaybeUtils.SetInnerValue(existingValue, value);
}
else
{
existingValue = MaybeUtils.Create(valueType, value);
}
return(existingValue);
}
public void TestCreate()
{
var maybe = (Maybe <int>)MaybeUtils.Create(10);
Assert.AreEqual(10, maybe.Value);
}
public void TestCreateNullValue()
{
var maybe = (Maybe <object>)MaybeUtils.Create(typeof(object), null);
Assert.IsNull(maybe.Value);
}
public void TestCreateNullValueWithoutType()
{
Assert.Throws <ArgumentNullException>(() => MaybeUtils.Create(null));
}
public void TestCreateNullType()
{
Assert.Throws <ArgumentNullException>(() => MaybeUtils.Create(null, new object()));
}