StackOverflow2013

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666487
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0
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2009-03-20T14:54:32.277
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2009-03-20T14:54:32.277
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44375
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663143
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2
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4
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Although I did recieved some prompt answers, and I thank you all for that. The method shown on the replies I've got didn't work. I had to keep searching until I eventually found a way to do what I needed in a post from Frederic Ouellet at <a href="http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/095745fe-dcf0-4142-b684-b7e4a1ab59f0" rel="nofollow noreferrer">Microsoft Forums</a>. In short it's the extension method below: <pre><code> public static IQueryable<T> WhereIn<T, TValue>(this IQueryable<T> source, Expression<Func<T, TValue>> propertySelector, params TValue[] values) { return source.Where(GetWhereInExpression(propertySelector, values)); } public static IQueryable<T> WhereIn<T, TValue>(this IQueryable<T> source, Expression<Func<T, TValue>> propertySelector, IEnumerable<TValue> values) { return source.Where(GetWhereInExpression(propertySelector, values)); } private static Expression<Func<T, bool>> GetWhereInExpression<T, TValue>(Expression<Func<T, TValue>> propertySelector, IEnumerable<TValue> values) { ParameterExpression p = propertySelector.Parameters.Single(); if (!values.Any()) return e => false; var equals = values.Select(value => (Expression)Expression.Equal(propertySelector.Body, Expression.Constant(value, typeof(TValue)))); var body = equals.Aggregate<Expression>((accumulate, equal) => Expression.Or(accumulate, equal)); return Expression.Lambda<Func<T, bool>>(body, p); } </code></pre>
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1. POHow to query multiple entities at once?
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1. USPaulo Santos
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1. POHow to query multiple entities at once?
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