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POBuildNotContainsExpression causes System.StackOverflowException with large data set on Windows 7 -64-bit
 

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  1. POBuildNotContainsExpression causes System.StackOverflowException with large data set on Windows 7 -64-bit
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    <p>I have encountered a condition where my app crashes with a particular dataset on Windows 7, 64-bit. All other platforms work fine on the same dataset. I have determined that my app is crashing in the BuildNotContainsExpression that many people have posted.</p> <p>Is there a way for the expression to be built using memory from the heap?<br> Should I just break done my usersActive list and process smaller chunks at a time (like 1000)?<br> Something else? </p> <pre><code>List&lt;int&gt; usersActive = myContext.myTable.Select(a =&gt; a.tableUsersSnapshot.id).Distinct().ToList(); // The code blows up (only on Win7 64-bit) on this line when usersActive is large ~4000 // (probably will blow up on all platforms if usersActive is sufficiently large) expTest = CustomExpressions.BuildNotContainsExpression&lt;tableUsersSnapshot, int&gt;(a =&gt; a.id, usersActive); List&lt;tableUsersSnapshot&gt; usersToDelete = myContext.myTableSnapshot.Where(expTest).ToList(); // Delete the objects in the delete list foreach(tableUsersSnapshot user in usersToDelete) { myContext.DeleteObject(user); } </code></pre> <p>Edit: Here's the BuildNotContains function - it is not recursive: </p> <pre><code>public static Expression&lt;Func&lt;TElement, bool&gt;&gt; BuildNotContainsExpression&lt;TElement, TValue&gt;(Expression&lt;Func&lt;TElement, TValue&gt;&gt; valueSelector, IEnumerable&lt;TValue&gt; values) { if (null == valueSelector) { throw new ArgumentNullException("valueSelector");} if (null == values) { throw new ArgumentNullException("values"); } ParameterExpression p = valueSelector.Parameters.Single(); // p =&gt; valueSelector(p) != values[0] &amp;&amp; valueSelector(p) != ... if (!values.Any()) { return e =&gt; true; } var equals = values.Select(value =&gt; (Expression)Expression.NotEqual(valueSelector.Body, Expression.Constant(value, typeof(TValue)))); var body = equals.Aggregate&lt;Expression&gt;((accumulate, equal) =&gt; Expression.And(accumulate, equal)); return Expression.Lambda&lt;Func&lt;TElement, bool&gt;&gt;(body, p); } </code></pre> <p>Here's the applicable portion of my EDMX diagram: <img src="https://i.stack.imgur.com/3T8c6.png" alt="alt text"></p>
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    1. USejwipp
    1. USejwipp
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    1. CORequired comment for StackOverflow in question name :)
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      1. POBuildNotContainsExpression causes System.StackOverflowException with large data set on Windows 7 -64-bit
      1. USRichard J. Ross III
    2. COWhat does BuildNotContains look like? It sounds recursive, but I can't think of a reason for it to be such.
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      1. POBuildNotContainsExpression causes System.StackOverflowException with large data set on Windows 7 -64-bit
      1. USMarc Gravell
    3. COAlso, does `where !someArray.Contains(a.Id)` not work in EF? I would expect it to work in LINQ-to-SQL...
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      1. POBuildNotContainsExpression causes System.StackOverflowException with large data set on Windows 7 -64-bit
      1. USMarc Gravell
 

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