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POUnable to create a constant value - only primitive types or Enumeration types allowed
 

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  1. POUnable to create a constant value - only primitive types or Enumeration types allowed
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    <p>I have seen some questions related to this Exception here but none made me understand the root cause of the problem. So here we have one more...</p> <pre><code>var testquery = ((from le in context.LoanEMIs.Include("LoanPmnt") join lp in context.LoanPmnts on le.Id equals lp.LoanEMIId where lp.PmntDtTm &lt; date &amp;&amp; lp.IsPaid == false &amp;&amp; le.IsActive == true &amp;&amp; lp.Amount &gt; 0 select new ObjGetAllPendingPmntDetails { Id = lp.Id, Table = "LoanEMI", loanEMIId = lp.LoanEMIId, Name = le.AcHead, Ref = SqlFunctions.StringConvert((double)le.FreqId), PmntDtTm = lp.PmntDtTm, Amount = lp.Amount, IsDiscard = lp.IsDiscarded, DiscardRemarks = lp.DiscardRemarks }).DefaultIfEmpty(ObjNull)); List&lt;ObjGetAllPendingPmntDetails&gt; test = testquery.ToList(); </code></pre> <p>This query gives the following Exception Message - </p> <blockquote> <p>Unable to create a constant value of type <code>CashVitae.ObjGetAllPendingPmntDetails</code>. Only primitive types or enumeration types are supported in this context.</p> </blockquote> <p>I got this Exception after I added the SQL function statement to convert <code>le.FreqId</code> which is a <code>byte</code> to a <code>string</code> as <code>ToString()</code> is not recognized in the LINQ Expression Store.</p> <p><code>ObjGetAllPendingPmntDetails</code> is a partial class in my model which is added as it is used too many times in the code to bind data to tables. It has both <code>ID</code>s as long, 'Amount' as decimal, <code>PmntDtTm</code> as <code>Datetime</code>,<code>IsDiscard</code> as bool and remaining all are string including 'Ref'.</p> <p>I get no results as currently no data satisfies the condition. While trying to handle null, I added <code>DefaultIfEmpty(ObjNull)</code> and <code>ObjNull</code> has all properties initialized as follows.</p> <pre><code>ObjGetAllPendingPmntDetails ObjNull = new ObjGetAllPendingPmntDetails() { Id = 0, Table = "-", loanEMIId = 0, Name = "-", Ref = "-", PmntDtTm = Convert.ToDateTime("01-01-1900"), Amount = 0, IsDiscard = false, DiscardRemarks = "" }; </code></pre> <p>I need this query to work fine as it has <code>Union()</code> called on it with 5 other queries. All returning the same <code>ObjGetAllPendingPmntDetails</code> columns. But there is some problem as this query has no data satisfying the conditions and the Exception Shared Above. </p> <p>Any suggestions are appreciated as I am unable to understand the root cause of the problem.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
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    1. USIt'sNotALie.
    1. USJayant Shelke
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
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      1. POUnable to create a constant value - only primitive types or Enumeration types allowed
      1. This table or related slice is empty.
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      1. POUnable to create a constant value - only primitive types or Enumeration types allowed
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    1. COYour `.DefaultIfEmpty(ObjNull)` code looks suspect to me. It doesn't look necessary, really, in that you're invoking `.ToList()` on the result. Do you really want the "no matching items found" case to try to return a `List` of length one?
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      1. POUnable to create a constant value - only primitive types or Enumeration types allowed
      1. USAndrew Coonce
 

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