CODEWITHSUNDEEP
c#linqentity-frameworkanonymous-types
GibboK
GibboK

Reputation: 73908

Linq - How to collect Anonymous Type as Result for a Function

I use c# 4 asp.net and EF 4. I'm precompiling a query, the result should be a collection of Anonymous Type.

At the moment I use this code.

public static readonly Func<CmsConnectionStringEntityDataModel, string, dynamic>     
queryContentsList =
CompiledQuery.Compile<CmsConnectionStringEntityDataModel, string, dynamic>
(
    (ctx, TypeContent) => ctx.CmsContents.Where(c => c.TypeContent == TypeContent 
 & c.IsPublished == true & c.IsDeleted == false)
        .Select(cnt => new
      { 
         cnt.Title, 
         cnt.TitleUrl, 
         cnt.ContentId, 
         cnt.TypeContent, cnt.Summary 
      }
            )
   .OrderByDescending(c => c.ContentId));

I suspect the RETURN for the FUNCTION Dynamic does not work properly and I get this error

Sequence contains more than one element enter code here.

I suppose I need to return for my function a Collection of Anonymous Types...

Do you have any idea how to do it? What I'm doing wrong? Please post a sample of code thanks!

Update:

    public class ConcTypeContents
        {
            public string Title { get; set; }
            public string TitleUrl { get; set; }
            public int ContentId { get; set; }
            public string TypeContent { get; set; }
            public string Summary { get; set; }
        }

        public static readonly Func<CmsConnectionStringEntityDataModel, string, ConcTypeContents> queryContentsList =
CompiledQuery.Compile<CmsConnectionStringEntityDataModel, string, ConcTypeContents>(
    (ctx, TypeContent) => ctx.CmsContents.Where(c => c.TypeContent == TypeContent & c.IsPublished == true & c.IsDeleted == false)
        .Select(cnt => new ConcTypeContents { cnt.Title, cnt.TitleUrl, cnt.ContentId, cnt.TypeContent, cnt.Summary }).OrderByDescending(c => c.ContentId));

Upvotes: 1

Views: 376

Answers (1)

spender
spender

Reputation: 120380

You should not return an anonymous type from a method. Create a concrete type to hold whatever data is currently held in the anonymous type and return that instead.

...
.Select(cnt => 
    new ConcType{ 
        Title = cnt.Title, 
        TitleUrl = cnt.TitleUrl, 
        ContentId = cnt.ContentId, 
        TypeContent = cnt.TypeContent,  
        Summary = cnt.Summary })
...

where:

class ConcType
{
    public string Title {get; set;}
    //etc...
}

Upvotes: 5

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