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POHow to create a LINQ to Entities query including both tag class name and text string
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  1. POHow to create a LINQ to Entities query including both tag class name and text string
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    copied!<p>My ASP.NET MVC project has some</p> <blockquote> <p>chapter class</p> </blockquote> <p>and related </p> <blockquote> <p>tag class</p> </blockquote> <p>They have many to many relationship though one tag has multiple chapter and also one chapter has multiple tags on it.</p> <p>My question is: I want to make a query by using <code>tag.title</code> within this structure but LINQ doesn't allow objects; it only gets variables like <code>string</code>, <code>int</code> ...etc.</p> <p>I am feeling a little bit stupid but I can't figured it out this basic thing :( (May be I have to give a break to let it be clear in my mind)</p> <p>My models are:</p> <pre><code>public partial class Chapter { public string Id { get; set; } public string Subject { get; set; } public string Content { get; set; } public virtual ICollection&lt;Tag&gt; Tags { get; set; } } public partial class Tag { public int? TagId { get; set; } public string Title { get; set; } public int CallCount { get; set; } public virtual ICollection&lt;Chapter&gt; Chapters { get; set; } } </code></pre> <p>and also for db:</p> <pre><code>public class DataContext : DbContext { public DbSet&lt;Chapter&gt; Chapters { get; set; } public DbSet&lt;Tag&gt; Tags { get; set; } } </code></pre> <p>so here we go:</p> <pre><code>var tag = (from t in db.Tags where t.Title.Contains(search_word)).FirstOrDefault(); var chapters = (from c in db.Chapters where (m.Title.Contains(search_word) || m.Tags.Contains(tag)) select c).ToList(); </code></pre> <p>As I explained above; it gives </p> <blockquote> <p>"you should use string, guid, int... on queries"</p> </blockquote> <p>error for this query. I think there is a logical failure I made but my brain stopped responding...</p> <p>Briefly; I want to search by tag names and if you have another approach I will be pleased to listen it..</p> <p>Any help will be highly appreciated.</p> <p>Thanks!</p>
 

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