Comments on: Linq To Sql: Dynamic Where Clause

By: Cláusulas “where” Dinâmicas usando LINQ to SQL no Visual Studio 2010 « >Compilar

Tue, 01 Mar 2011 20:59:52 +0000

[...] Fonte: http://rogeralsing.com/2009/11/21/linq-to-sql-dynamic-where-clause/ Arquivado em Dicas ← Python é eleito a linguagem de 2010 LikeBe the first to like this post. [...]

By: Mrkraju

Mrkraju — Tue, 25 May 2010 09:57:43 +0000

Thank you some much it helped me a lot and reduced the code lines..

By: dave

dave — Sat, 30 Jan 2010 18:55:44 +0000

You can use the LINQKit’s (http://www.albahari.com/nutshell/linqkit.aspx) Predicate builder to do the OR’s and whatnot. Of course you could also write your own, but it’s pretty.

By: Steven

Steven — Sat, 21 Nov 2009 19:06:46 +0000

I rather let the calling layer supply a query object that does this. The calling code could look like this:

var filter = EntityFilter
.Where(c => c.Name == came)
.Where(c => c.City == city);

var customers = FindCustomers(filter);

Your repository could now look like this:

Customer[] FindCustomers(IEntityFilter filter)
{
var query = context.Customers;
query = filter.Filter(query);
return query.ToArray();
}

I wrote about this concept here: http://www.cuttingedge.it/blogs/steven/pivot/entry.php?id=66.

The code for this EntityFilter can be found on CodePlex, here: http://servicelayerhelpers.codeplex.com/SourceControl/changeset/view/32810#537055.

Cheers