private bool TryGetOwnValue <T>(FieldKey key, Entity context, out T value)
{
if (OwnValues != null)
{
object @objectValue;
if (OwnValues.TryGetValue(key, out @objectValue))
{
if (objectValue is T tValue)
{
value = tValue;
return(true);
}
else
{
var producer = objectValue as IValueProducer <T>;
if (producer != null)
{
value = producer.Produce(context);
return(true);
}
else
{
try
{
value = (T)Convert.ChangeType(objectValue, typeof(T));
return(true);
}
catch
{
var format = "Unexpected field type. Expect {0}, got {1}";
var message = String.Format(format, typeof(T).Name, objectValue.GetType().Name);
throw new Exception(message);
}
}
}
}
}
value = default(T);
return(false);
}
public void Merge(FieldList other)
{
var fieldKey = SystemField.DeletedKeys.ToFieldKey();
if (other.TryGetValue(fieldKey, out object value))
{
var deletedKeys = value as List <FieldKey>;
if (deletedKeys != null)
{
foreach (var key in deletedKeys)
{
this.Remove(key);
}
}
other.Remove(fieldKey);
}
foreach (var pair in other)
{
this[pair.Key] = pair.Value;
}
}