Dynamically selecting a table in LINQ

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Hi All

I have a weird scenario of generalization. Is it possible in LINQ to set the table name on the fly ?

I have a dropdown that dictates which table to query.

If selectedValue == ItemA
Query tableA
else
Query tableB

Now this tableB is not there yet and will be added later on but its structure will be exactly similar to tableA. Currently our DAL is implemented using LINQ. Is it possible to handle this scenario in LINQ ?

In my R&D I've found SQLMetal. Can I use it using external mapping files ?

Regards

Posted 4-Jul-11 21:59pm

Phan7om

Updated 4-Jul-11 22:03pm

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Shahriar Iqbal Chowdhury/Galib · Answer 1 · 2011-07-05T01:48:00

Solution 2

hi,
Check these links below
http://geekswithblogs.net/SudheersBlog/archive/2008/11/25/127380.aspx[^]
http://social.msdn.microsoft.com/forums/en-US/linqprojectgeneral/thread/6273d072-f500-4382-afb4-8eafd185794d/[^]

also you can try DynamicQueryable feature of LINQ
http://blogs.msdn.com/b/marcinon/archive/2010/01/14/building-custom-linq-expressions-made-easy-with-dynamicqueryable_2e00_.aspx[^]

Hope this will help.

Posted 5-Jul-11 1:48am

Shahriar Iqbal Chowdhury/Galib

Comments

Phan7om 5-Jul-11 8:46am

Thanks shahriar
I came across these links in my RnD but in all the examples out there on the internet, the types corresponding to a table were defined but in my case the tables will arrive later on and I cannot define the table-class mapping at dev time. So I cannot determine what would be the type of the table.

Till now I think it cannot be done using LINQ, and I have to move to ADO.NET

Christian Graus · Answer 2 · 2011-07-04T22:02:00

Solution 1

I suspect that, like any code generation task, you'd need to use reflection to do this.

Posted 4-Jul-11 22:02pm

Christian Graus