Question

I want to use chained linq. I am having some trouble with the syntax.

select * from APPLES
inner join BANANAS on APPLES.id = BANANAS.someid

I have:

var result = workspace.GetDataSource<APPLE>().Join(.......)

but I am unsure about what goes into the Join bit. Could someone help me out?

Answer 1

How about:

var result = from a in workspace.GetDataSource<APPLE>()
             from b in workspace.GetDataSource<BANANAS>()
             where a.id == b.someid
             select a;

or if you want to use join notation:

var result = from a in workspace.GetDataSource<APPLE>()
             join b in workspace.GetDataSource<BANANAS>()
             on a.id equals b.someid
             select a;

Note, you can change the select a to a projection of the elements you need from both tables.

Not as familiar with this format, but it would be something like this:

var result = workspace.GetDataSource<APPLE>().Join(workspace.GetDataSource<BANANAS>(),a=>a.id, b=>b.someid,(a,b) => a);