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POOptional output parameter causes InvalidOperationException when no value is submitted with Enterprise lib 5.0
 

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  1. POOptional output parameter causes InvalidOperationException when no value is submitted with Enterprise lib 5.0
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    <p>I'm having problem with output Parameters in Microsoft Sequel Server 2008 with Enterprise Library 5.0</p> <p>I'm calling a procedure from my code (in C#) and it worked fine until I added an optional output parameter to the stored proc to track feedback.</p> <p>The Code for calling the proc from my code:</p> <pre><code>string insertCommand = insertParams[0]; //the stored proc command Object[] parameterValues = insertParams.Skip(1).ToArray(); //The parameters int feedback = 1; IDataReader reader = localDB.ExecuteReader(insertCommand, parameterValues); //ERROR if (reader.Eead()){ //stuf </code></pre> <p>During debug parameterValues contains one object. The error I get is</p> <p>[System.InvalidOperationException] = {"The number of parameters does not match number of values for stored procedure."}</p> <p>My stored proc looks like this:</p> <pre><code>ALTER PROCEDURE [dbo].[BS_GetDetails] @BusStop_ID INT, @FEEDBACK_CODE INT=NULL OUTPUT AS BEGIN SET NOCOUNT ON; SELECT @FEEDBACK_CODE = 200 //Do lots of other non-related things, mostly select statements </code></pre> <p>When I call the stored proc from inside the Database with only one parameter it works fine, but as I get the error in my code after I added the extra optional output param</p> <p>I could create a second stored proc to call the first, but that seems like a hacky solution and I suspect I'm missing something subtle here...</p>
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    1. COIt seems like ExecuteReader is overly strict and doesn't cater properly for optional paramters. using a more lengthy approach with ExecuteNonQuery and manually inserting parameters worked.
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