Class KeyOnlyAttribute
Stores a property only inside a key and restores it by parsing that key, which saves the bytes of a separate attribute. No attribute holds it, so it has no handle in Attrs: a condition, a filter, an update and
Select cannot name it.
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public sealed class KeyOnlyAttribute : Attribute- Inheritance
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KeyOnlyAttribute
- Inherited Members
Remarks
At least one key template must hold the property without loss. Text and numbers do, and a timestamp needs the format
ticks, which a placeholder without a format has: every other format truncates. No format keeps the offset of a DateTimeOffset, which an attribute does
not store either. Generated projections include every key a property is restored from. A property without this attribute is stored, so an input of a template such as appointment#{Key:raw} adds an attribute
Key to every item a Put writes. This attribute is for items that do not hold it: on a table whose items hold it, a Put drops it. A read restores such a property the same way only if its attribute is missing, which is what an item created by an update looks like; a key that does not parse then restores nothing.
Constructors
KeyOnlyAttribute()
public KeyOnlyAttribute()