/// <summary>
/// 获取当前数据更新模型上的给定成员上的数据更新定义。
/// </summary>
/// <param name="property">当前数据更新模型上的属性成员。</param>
/// <param name="parentPath">从更新模型的根到当前更新模型的父节点的路径。</param>
/// <returns>当前数据更新模型上的给定成员上的数据更新定义。若给定的成员没有任何更新数据，返回 null。</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="property"/> 为 null。
/// </exception>
private UpdateDefinition <TRootEntity> ResolveMemberUpdateDefinition(PropertyInfo property, ObjectPath parentPath)
{
Contract.NotNull(property, nameof(property));
// 如果成员的值是一个 Maybe<T> 类型，则将其展开为内部值
var memberValue = property.GetValue(this);
if (memberValue != null && MaybeUtils.IsMaybe(memberValue))
{
var maybe = MaybeUtils.Unbox(memberValue);
if (maybe.HasValue)
{
memberValue = maybe.Value;
}
else
{
return(null);
}
}
if (memberValue is UpdateInfo <TRootEntity> memberUpdateInfo)
{
var currentPath = parentPath.Push(property.Name);
return(memberUpdateInfo.CreateUpdateDefinition(currentPath));
}
return(property.GetCustomAttribute <UpdateVerbAttribute>()
?.Resolve <TRootEntity>(property, memberValue, parentPath));
}
public void TestUnbox()
{
var maybe = MaybeUtils.Unbox(new Maybe <int>(10));
Assert.IsTrue(maybe.HasValue);
Assert.IsInstanceOf <int>(maybe.Value);
Assert.AreEqual(10, maybe.Value);
}
/// <inheritdoc />
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
if (value == null)
{
writer.WriteNull();
return;
}
var maybeValue = MaybeUtils.Unbox(value);
if (!maybeValue.HasValue)
{
// 对于空的 Optional<T> 实例，向 JSON 输出写入 undefined
writer.WriteUndefined();
return;
}
serializer.Serialize(writer, maybeValue.Value);
}
/// <inheritdoc />
public override bool IsValid(object value)
{
if (value == null)
{
return(true);
}
if (!MaybeUtils.IsMaybe(value))
{
return(true);
}
var maybe = MaybeUtils.Unbox(value);
if (!maybe.HasValue)
{
return(true);
}
var innerAttr = ActivateInnerValidationAttribute();
return(innerAttr.IsValid(maybe.Value));
}
public void TestUnboxEmpty()
{
var maybe = MaybeUtils.Unbox(new Maybe <int>());
Assert.IsFalse(maybe.HasValue);
}
public void TestUnboxNonMaybe()
{
Assert.Throws <ArgumentException>(() => MaybeUtils.Unbox(10));
}
public void TestUnboxNull()
{
Assert.Throws <ArgumentNullException>(() => MaybeUtils.Unbox(null));
}