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POStrange LINQ Exception (Index out of bounds)
 

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    <p>I have a table, we'll call <code>Users</code>. This table has a single primary key defined in SQL Server - an autoincrement <code>int ID</code>.</p> <p>Sometimes, my LINQ queries against this table fail with an <code>"Index was outside the range"</code> error - even the most simplest of queries. The query itself doesn't use any indexers.</p> <p>For example: </p> <pre><code>User = Users.Take(1); </code></pre> <p>or</p> <pre><code>IEnumerable&lt;Users&gt; = Users.ToList(); </code></pre> <p>Both of the queries threw the same error. Using the debugger Visualizer to look at the generated query - I copy and paste the query in SQL and it works fine. I also click "execute" on the visualizer and it works fine. But executing the code by itself throws this error. I don't implement any of the partial methods on the class, so nothing is happening there. If I restart my debugger, the problem goes away, only to rear it's head again randomly a few hours later. More critically, I see this bug in my error logs from the app running in production. </p> <p>I do a ton of LINQ in my app, against a dozen or so different entities in my database, but I only see this problem on queries related to a specific entity in my table. Some googling has suggested that this problem might be related to an incorrect relationship specified between my model and another entity, but I don't have <em>any</em> relationships with this object. It seems to be working 95% of the time, it's just the other 5% that fail.</p> <p>I have completely deleted the object from the designer, and re-added it from a "refreshed" server browser, and that did not fix the problem.</p> <p>Any ideas what's going on here?</p> <p>Here's the full error message and stack trace:</p> <blockquote> <p>Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) at System.Data.Linq.Table<code>1.System.Linq.IQueryProvider.Execute[TResult](Expression expression) at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable</code>1 source, Expression`1 predicate) at MyProject.FindUserByType(String typeId)</p> </blockquote> <p>EDIT: As requested, below is a copy of the table schema.</p> <pre><code>CREATE TABLE [dbo].[Container]( [ID] [int] IDENTITY(1,1) NOT NULL, [MarketCode] [varchar](max) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL, [Description] [varchar](max) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL, [Capacity] [int] NOT NULL, [Volume] [float] NOT NULL CONSTRAINT [PK_Container] PRIMARY KEY CLUSTERED ( [ID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] </code></pre> <p>EDIT: The stack trace shows <code>FirstOrDefault</code>, but I duplicated the error using both <code>Take()</code> and <code>ToList()</code>. The stack trace is identical between all of these, simply interchangnig <code>FirstOrDefault/Take/ToList</code>. The move down the stack to <code>SqlProvider.Execute</code> is in fact identical. </p>
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    1. USMatt
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    1. CONo idea on what is happening, but fascinating! If all else fails, you could try the General Linq Project list: http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=123&SiteID=1
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    2. COIt might help if we could see the table definition.
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    3. CO( mssql -> Databases -> the_db -> Tables -> the_bad_table -> right click -> Script Table as -> Create To)
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