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V3078. Original sorting order will be l…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V3078. Original sorting order will be lost after repetitive call to 'OrderBy' method. Use 'ThenBy' method to preserve the original sorting.

Mar 10 2016

The analyzer detected a possible error that has to do with using method 'OrderBy' or 'OrderByDescending' for a collection of type 'IOrderedEnumerable'. It may be related to the fact that this method was called twice while the second call should actually have been done to method 'ThenBy' or 'ThenByDescending'. The problem about this issue is that calling 'OrderBy...' for the second time won't take into account the first sort order of the collection, unlike 'ThenBy...'.

Consider the following example:

var seq = points.OrderBy(item => item.Line)
                .OrderBy(item => item.Column);

In this code, a sequence is first sorted by lines, and then the resulting collection is re-sorted by columns. The second sort ignores the result of the first sort.

To keep the previous sort result, one must call the 'ThenBy' method for the second sort.

var seq = points.OrderBy(item => item.Line)
                .ThenBy(item => item.Column);

A similar mistake can be made when using query syntax:

var seq = from item in points
          orderby item.Line
          orderby item.Column 
          select item;

The second sort will lead to losing the first result, too. The code can be fixed as follows:

var seq = from item in points
          orderby item.Line, item.Column
          select item;

You can look at examples of errors detected by the V3078 diagnostic.

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