public void TestSetInnerValueNonNullableNull()
{
var maybe = new Maybe <int>();
var boxedMaybe = (object)maybe;
Assert.Throws <InvalidOperationException>(() => MaybeUtils.SetInnerValue(boxedMaybe, null));
}
public void TestSetInnerValueNullValue()
{
var maybe = new Maybe <object>();
var boxedMaybe = (object)maybe;
MaybeUtils.SetInnerValue(boxedMaybe, null);
maybe = (Maybe <object>)boxedMaybe;
Assert.IsNull(maybe.Value);
}
public void TestSetInnerValue()
{
var maybe = new Maybe <int>();
var boxedMaybe = (object)maybe;
MaybeUtils.SetInnerValue(boxedMaybe, 10);
maybe = (Maybe <int>)boxedMaybe;
Assert.AreEqual(10, maybe.Value);
}
public void TestSetInnerValueDerived()
{
var maybe = new Maybe <IList <int> >();
var boxedMaybe = (object)maybe;
var innerValue = new List <int>();
MaybeUtils.SetInnerValue(boxedMaybe, innerValue);
maybe = (Maybe <IList <int> >)boxedMaybe;
Assert.AreSame(innerValue, maybe.Value);
}
/// <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 TestSetInnerValueTypeMismatch()
{
Assert.Throws <InvalidOperationException>(() => MaybeUtils.SetInnerValue(new Maybe <int>(), new object()));
}
public void TestSetInnerValueNonMaybe()
{
Assert.Throws <ArgumentException>(() => MaybeUtils.SetInnerValue(new object(), new object()));
}
public void TestSetInnerValueNull()
{
Assert.Throws <ArgumentNullException>(() => MaybeUtils.SetInnerValue(null, 10));
Assert.DoesNotThrow(() => MaybeUtils.SetInnerValue(new Maybe <object>(), null));
}