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2011-09-02T15:31:00.133
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2011-09-02T16:01:59.387
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Body
After calling <code>GroupBy</code>, you get a series of groups <code>IEnumerable<Grouping></code>, where each Grouping itself exposes the <code>Key</code> used to create the group and also is an <code>IEnumerable<T></code> of whatever items are in your original data set. You just have to call <code>Count()</code> on that Grouping to get the subtotal. <pre><code>foreach(var line in data.GroupBy(info => info.metric) .Select(group => new { Metric = group.Key, Count = group.Count() }) .OrderBy(x => x.Metric) { Console.WriteLine("{0} {1}", line.Metric, line.Count); } </code></pre> <hr /> <blockquote> This was a brilliantly quick reply but I'm having a bit of an issue with the first line, specifically "data.groupby(info=>info.metric)" </blockquote> I'm assuming you already have a list/array of some <code>class</code> that looks like <pre><code>class UserInfo { string name; int metric; ..etc.. } ... List<UserInfo> data = ..... ; </code></pre> When you do <code>data.GroupBy(x => x.metric)</code>, it means "for each element <code>x</code> in the IEnumerable defined by <code>data</code>, calculate it's <code>.metric</code>, then group all the elements with the same metric into a <code>Grouping</code> and return an <code>IEnumerable</code> of all the resulting groups. Given your example data set of <pre><code> <DATA> | Grouping Key (x=>x.metric) | joe 1 01/01/2011 5 | 1 jane 0 01/02/2011 9 | 0 john 2 01/03/2011 0 | 2 jim 3 01/04/2011 1 | 3 jean 1 01/05/2011 3 | 1 jill 2 01/06/2011 5 | 2 jeb 0 01/07/2011 3 | 0 jenn 0 01/08/2011 7 | 0 </code></pre> it would result in the following result after the groupby: <pre><code>(Group 1): [joe 1 01/01/2011 5, jean 1 01/05/2011 3] (Group 0): [jane 0 01/02/2011 9, jeb 0 01/07/2011 3, jenn 0 01/08/2011 7] (Group 2): [john 2 01/03/2011 0, jill 2 01/06/2011 5] (Group 3): [jim 3 01/04/2011 1] </code></pre>
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singulars
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1. This table or related slice is empty.
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1. POLINQ with groupby and count
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1. PTAnswer
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1. USJimmy
UserOwnerUserId
1. USJimmy
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1. POLINQ with groupby and count
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1. This table or related slice is empty.
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2. VO
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3. VO
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