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2011-04-27T15:39:29.677
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2011-04-27T15:39:29.677
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I created a pair of extension methods that could help you out: ObjectWithMin and ObjectWithMax: <pre><code>public static T ObjectWithMax<T, TResult>(this IEnumerable<T> elements, Func<T, TResult> projection) where TResult : IComparable<TResult> { if (elements == null) throw new ArgumentNullException("elements", "Sequence is null."); if (!elements.Any()) throw new ArgumentException("Sequence contains no elements."); var seed = elements.Select(t => new {Object = t, Projection = projection(t)}).First(); return elements.Aggregate(seed, (s, x) => projection(x).CompareTo(s.Projection) >= 0 ? new {Object = x, Projection = projection(x)} : s ).Object; } public static T ObjectWithMin<T, TResult>(this IEnumerable<T> elements, Func<T, TResult> projection) where TResult : IComparable<TResult> { if (elements == null) throw new ArgumentNullException("elements", "Sequence is null."); if (!elements.Any()) throw new ArgumentException("Sequence contains no elements."); var seed = elements.Select(t => new {Object = t, Projection = projection(t)}).First(); return elements.Aggregate(seed, (s, x) => projection(x).CompareTo(s.Projection) < 0 ? new {Object = x, Projection = projection(x)} : s ).Object; } </code></pre> These two are more efficient than OrderBy().FirstOrDefault() when used on in-memory collections; however they're unparseable by IQueryable providers. You'd use them something like this: <pre><code>ts = context.Documents .Where(r => r.CustomerID == ThisCustomerID) .ObjectWithMax(r=>r.m_Timestamp); </code></pre> <code>ts</code> is now the object having the most recent timestamp, so you don't need a second query to get it.
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1. PORe-use parts of a linq query
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1. USKeithS
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1. COI believe OP is talking about database access, meaning that these aggregate delegates will be too complex to be translated into sql.
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Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.