Use [PrimaryKey,AutoIncrement] from SQLite in .NET MAUI with [ObservableProperty]

Question

As the title says, I defined my member, for example my Id, as an Observable Property using the CommunityToolKit.Mvvm package.

[ObservableProperty]
private int id;

But now I am trying to decorate my Observable Property with the [PrimaryKey,AutoIncrement] attributes from the SQLite extension. But I can't just write it like that cause we have no self-defined property, only the generated one.

Is there a way to add that annotation while it still is an ObservableProperty?

I Imagine it something like that:

[ObservableProperty]
[PrimaryKey, AutoIncrement]
private int id;

Julian · Accepted Answer · 2024-04-22 13:25:25Z

4

When you need an extra annotation with [ObservableProperty] (that is not part of the toolkit itself), you have to prefix it with "property:".

So your property could be written like this:

[ObservableProperty]
[property: PrimaryKey]
[property: AutoIncrement]
private int id;

This way your property will be generated with the [PrimaryKey] and [AutoIncrement] attributes over it.

See also: https://learn.microsoft.com/dotnet/communitytoolkit/mvvm/generators/observableproperty#adding-custom-attributes

edited Apr 22, 2024 at 13:25

Julian

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answered Aug 19, 2023 at 7:30

Dawied

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1 Comment

Cfun Over a year ago

For anyone wondering what [property: does ? check attribute-targets docs.

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