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POLINQ for groupby and then finding the value based on least date
 

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  1. POLINQ for groupby and then finding the value based on least date
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    <p>I have some data which i want to parse and then based on that, i have to take the data for the date which is minimun for each group.</p> <p>Data files is as below ( a small sinppet)</p> <pre><code>D_REPDATE;INDEX;MATLABEL;ST_START;ST_END;QT_START;QT_END;PRC_RF0;PRC_RF1 APR-13;04/01/13;F35MEDFC;APR-13;01/04/13;30/04/13;01/04/11;29/03/13;596.02000;596.02000 APR-14;04/01/13;F35MEDFC;APR-14;01/04/14;30/04/14;30/03/12;31/03/14;581.77000;581.77000 APR-15;04/01/13;F35MEDFC;APR-15;01/04/15;30/04/15;01/04/13;31/03/15;567.27000;567.27000 APR-16;04/01/13;F35MEDFC;APR-16;01/04/16;30/04/16;01/04/14;31/03/16;556.52000;556.52000 APR-17;04/01/13;F35MEDFC;APR-17;01/04/17;30/04/17;01/04/15;31/03/17;548.77000;548.77000 APR-13;04/01/13;BR DATED;APR-13;01/04/13;30/04/13;01/04/11;29/03/13;108.46000;108.46000 APR-14;04/01/13;BR DATED;APR-14;01/04/14;30/04/14;30/03/12;31/03/14;102.53000;102.53000 APR-15;04/01/13;BR DATED;APR-15;01/04/15;30/04/15;01/04/13;31/03/15;98.19000;98.19000 APR-16;04/01/13;BR DATED;APR-16;01/04/16;30/04/16;01/04/14;31/03/16;94.49000;94.49000 JAN-21;04/01/13;F630GCW;JAN-21;01/01/21;31/01/21;01/01/19;31/12/20;85.57000;85.57000 JUL-13;04/01/13;F630GCW;JUL-13;01/07/13;31/07/13;01/07/11;28/06/13;93.50000;93.50000 JUL-14;04/01/13;F630GCW;JUL-14;01/07/14;31/07/14;29/06/12;30/06/14;90.95000;90.95000 JUL-15;04/01/13;F630GCW;JUL-15;01/07/15;31/07/15;01/07/13;30/06/15;88.83000;88.83000 JUL-16;04/01/13;F630GCW;JUL-16;01/07/16;31/07/16;01/07/14;30/06/16;87.01000;87.01000 </code></pre> <p>For each index for the min QT_END i want to read the PRC_RF0.</p> <p>I have written something like </p> <pre><code>class GMRTest { public string CRVLABEL; public string INDEX; public string MATLABEL; public DateTime ST_START; public DateTime ST_END; public DateTime QT_START; public DateTime QT_END; public string PRC_RF0; public string PRC_RF1; } </code></pre> <p>and reading this method into a list (listData)</p> <pre><code>listData.GroupBy(s =&gt; s.INDEX).Select( aa =&gt; new {Key = aa.Key, Data = aa.OrderBy(ab =&gt; ab.ST_START) } ); </code></pre> <p>However this is still giveing me all the data, what i want is the data with the min date (ST_START).</p> <p>Any help is appreciated.</p> <p>Thanks</p>
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