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POCannot be translated into a LINQ to Entities store expression from within a GroupBy LINQ query
 

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  1. POCannot be translated into a LINQ to Entities store expression from within a GroupBy LINQ query
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    <p>Casting a value in the extension method and the function in the edmx file is casting a value from a string to what we want.</p> <p>That's fine as long as I would know what the <em>a.Rating.RatingValue</em> and <em>c.RatingId</em> values are ahead of time. They are not hardcoded, nor do I know what the values would be ahead of time.</p> <p>UNfortunately, the first value is a Byte and the second value is an Int32.</p> <p>So, in my extension methods, I have to set them up as follows. Note that <em>Object.Parse(value)</em> only works if the value is a string, so I can't do it like that.</p> <p>With the below code, I'm still getting the same error message and is very frustrating. I don't know what else I need to do in order for it to convert successfully.</p> <p>I have a requirement to get this in by tomorrow. If anyone could be of help, I would appreciate it.</p> <p>Here is my query:</p> <pre><code>var restaurants = await DbContext.Restaurants.GroupBy(g =&gt; g).Select(s =&gt; new RestaurantList() { Name = s.Key.Name, City = s.Key.City, Phone = s.Key.Phone, AvgRating = s.Average(a =&gt; EdmxExtensionMethods.ParseDecimal(a.Rating.RatingValue)), NbrOfPeopleRating = s.Distinct().Count(c =&gt; EdmxExtensionMethods.ParseBoolean(c.RatingId)), Id = s.Key.Id }).ToListAsync(); return restaurants; } </code></pre> <p>Here are my extesnion methods. Again this class is outside the EDMX file on the root of the project:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Data.Entity; namespace BillYeagerDB { public partial class EdmxExtensionMethods : DbContext { [DbFunctionAttribute("BillYeagerDB", "ParseDecimal")] public static Decimal ParseDecimal(Int16 int16value) { return Convert.ToDecimal(int16value); } [DbFunctionAttribute("BillYeagerDB", "ParseBoolean")] public static bool ParseBoolean(Int32 intvalue) { return Convert.ToBoolean(intvalue); } } } </code></pre> <p>These are my functions inside the EDMX file:</p> <pre><code>&lt;edmx:ConceptualModels&gt; &lt;Schema Namespace="BillYeagerModel" Alias="Self" annotation:UseStrongSpatialTypes="false" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation" xmlns="http://schemas.microsoft.com/ado/2009/11/edm"&gt; &lt;Function Name="ParseDecimal" ReturnType="Edm.Decimal"&gt; &lt;Parameter Name="bytevalue" Type="Edm.Byte" /&gt; &lt;DefiningExpression&gt; cast(bytevalue as Edm.Decimal) &lt;/DefiningExpression&gt; &lt;/Function&gt; &lt;Function Name="ParseBoolean" ReturnType="Edm.Boolean"&gt; &lt;Parameter Name="intvalue" Type="Edm.Int32" /&gt; &lt;DefiningExpression&gt; cast(intvalue as Edm.Boolean) &lt;/DefiningExpression&gt; &lt;/Function&gt; </code></pre>
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    1. USsagesky36
    1. USsagesky36
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      1. USStefan
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    3. VO
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      1. VTModeratorReview
    1. COyet another very popular Entity Framework related exception.
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      1. POCannot be translated into a LINQ to Entities store expression from within a GroupBy LINQ query
      1. USKing King
    2. COYou appear to have a table called `Restaurants` that has both restaurants and their reviews. This is a bad sort of a non-[normalized DB](http://en.wikipedia.org/wiki/Database_normalization), and should be fixed (though I don't think it's related to your issue).
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      1. USTim S.
    3. COWhat is the error message? I don't think you told us...
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      1. USTim S.
 

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