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POASP.NET MVC/LINQ: What's the proper way to iterate through a Linq.EntitySet in a View?
 

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  1. POASP.NET MVC/LINQ: What's the proper way to iterate through a Linq.EntitySet in a View?
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    <p>OK so I have a strongly-typed Customer "Details" view that takes a Customer object Model.</p> <p>I am using LINQ to SQL and every Customer can have multiple (parking) Spaces.</p> <p>This is a FK relationship in the database so my LINQ-generated Customer model has a "Spaces" collection. Great!</p> <p>Here is a code snippet from my CustomerRepository where I iterate through the Customer's parking spaces to delete all payments, spaces and then finally the customer:</p> <pre><code>public void Delete(Customer customer) { foreach (Space s in customer.Spaces) db.Payments.DeleteAllOnSubmit(s.Payments); db.Spaces.DeleteAllOnSubmit(customer.Spaces); db.Customers.DeleteOnSubmit(customer); } </code></pre> <p>Everything works as expected!</p> <p>Now in my "Details" view I want to populate a table with the Customer's Spaces:</p> <pre><code>&lt;% foreach (var s in Model.Spaces) { %&gt; &lt;tr&gt; &lt;td&gt;&lt;%: s.ID %&gt;&lt;/td&gt; &lt;td&gt;&lt;%: s.InstallDate %&gt;&lt;/td&gt; &lt;td&gt;&lt;%: s.SpaceType %&gt;&lt;/td&gt; &lt;td&gt;&lt;%: s.Meter %&gt;&lt;/td&gt; &lt;/tr&gt; &lt;% } %&gt; </code></pre> <p>I get the following error:</p> <blockquote> <p>foreach statement cannot operate on variables of type 'System.Data.Linq.EntitySet' because 'System.Data.Linq.EntitySet' does not contain a public definition for 'GetEnumerator'</p> </blockquote> <p>Finally, if I add this bit of code to my Customer partial class and use the foreach in the view to iterate through ParkingSpaces everything works as expected:</p> <pre><code>public IEnumerable&lt;Space&gt; ParkingSpaces { get { return Spaces.AsEnumerable(); } } </code></pre> <p>The problem here is that I don't want to repeat myself. I was also thinking that I could use a ViewModel to pass a Spaces collection to the View, however LINQ already infers and creates the Spaces property on the Customer model so I think it would be cleanest to just use that.</p> <p>I am missing something simple or am I approaching this incorrectly?</p> <p>Thanks!</p>
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    1. COIs your view strongly typed to `IEnumerable<MyApplication.Model.Space>`? If it isn't, that's probably why you can't enumerate it, without that bit of helper code.
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      1. USRobert Harvey
    2. COMy view is strongly typed to Inherits="System.Web.Mvc.ViewPage<MyApplication.Models.Customer>" Perhaps I wasn't clear enough, but the view gives the account details of a Customer. The Customer has any number of Spaces which should also be displayed on this page. So I don't want just a list of Spaces, I want a detailed view of a Customer account including the Customer's Spaces.
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