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PO
 

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    <p>This query seems to be correct from point of view of result obtained.</p> <p>But in your inner query <code>tis.Where(p =&gt; p.PlanProgress != null &amp;&amp; p.PlanProgress &gt; 0).Max(w =&gt; w.EndDate)</code> is computed for each element in collection with <code>t.PlanProgress &gt; 0</code></p> <p>So its a better way to obtain Max value outside of a query as follows:</p> <pre><code>var max = tis.Where(p =&gt; p.PlanProgress != null &amp;&amp; p.PlanProgress &gt; 0).Max(w =&gt; w.EndDate); tis.First( t =&gt; t.PlanProgress &gt; 0 &amp;&amp; t.EndDate == max); </code></pre> <p>Going further p.PlanProgress != null is allways true since p.PlanProgress is not of Nullable type. So our code becomes like this:</p> <pre><code>var max = tis.Where(p =&gt; p.PlanProgress &gt; 0).Max(w =&gt; w.EndDate); tis.First( t =&gt; t.PlanProgress &gt; 0 &amp;&amp; t.EndDate == max); </code></pre> <p>Or you can change a definition of your class and make p.PlanProgress of Nullable type:</p> <pre><code>public class TaskWeekUI { public Guid TaskWeekId { get; set; } public Guid TaskId { get; set; } public Guid WeekId { get; set; } public DateTime EndDate { get; set; } public string PersianEndDate { get; set; } public double? PlanProgress { get; set; } public double ActualProgress { get; set; } } var max = tis.Where(p =&gt; p.PlanProgress.HasValue &amp;&amp; p.PlanProgress.Value &gt; 0).Max(w =&gt; w.EndDate); tis.First( t =&gt; t.PlanProgress.HasValue &amp;&amp; t.PlanProgress.Value &gt; 0 &amp;&amp; t.EndDate == max); </code></pre>
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    1. POLINQ- Max in where condition
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    1. USILya
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    1. CO+1, the only thing I would change is the `First` to a `FirstOrDefault` unless he can guarantee that there will always be an item with `PlanProgress > 0`
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      1. USMatthew Abbott
    2. CO+1, but I think 'collection.Max' throws an exception if 'collection' is empty, so there probably needs to be an additional check before setting 'max'. The collection will be empty if all PlanProgress <= 0. Since there are checks for PlanProgress > 0 I assume PlanProgress <= 0 is legal and an exception probably wouldn't be expected.
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      1. USWileCau
    3. COTnx for your response.
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      1. USShayan
 

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