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2013-04-28T11:07:39.887
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If you have long complicated entities then creating a projection by hand is a nightmare. <code>Automapper</code> doesn't work because LINQ cannot use it in conjunction with IQueryable. This here is the perfect solution : <a href="http://www.devtrends.co.uk/blog/stop-using-automapper-in-your-data-access-code" rel="nofollow"><code>Stop using AutoMapper in your Data Access Code</code></a> It will generate a projection 'magically' for you and enable you to run an oData query based on your DTO (data transfer object) class. <pre><code> [Queryable] public IQueryable<DatabaseProductDTO> GetDatabaseProductDTO(ODataQueryOptions<DatabaseProductDTO> options) { // _db.DatabaseProducts is an EF table // DatabaseProductDTO is my DTO object var projectedDTOs = _db.DatabaseProducts.Project().To<DatabaseProductDTO>(); var settings = new ODataQuerySettings(); var results = (IQueryable<DatabaseProductDTO>) options.ApplyTo(projectedDTOs, settings); return results.ToArray().AsQueryable(); } </code></pre> I run this with <pre><code>/odata/DatabaseProductDTO?$filter=FreeShipping eq true </code></pre> Note: this article is from a couple years ago and it's possible that by now <code>AutoMapper</code> has functionality like this built in. I just don't have time I check this myself right now. The inspiration for the above referenced article was based on <a href="http://lostechies.com/jimmybogard/2011/02/09/autoprojecting-linq-queries/" rel="nofollow">this article</a> by the author of AutoMapper itself - so it's possible some improved version of it is now included. The general concept seems great and this version is working well for me.
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1. POQuery DTO objects through WCF with linq to sql backend
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Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.