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POPopulating 3 columns in an excel sheet from C#, without having repeated values across rows
 

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  1. POPopulating 3 columns in an excel sheet from C#, without having repeated values across rows
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    <p>Sorry if the question title was a bit weird. I want to populate 500 excel rows with a composite primary key which consists of 3 columns. 2 columns automatically generate random int between 1 and 50 and third is a date between 01.01.2006 and 31.12.2013. So i want to have 500 rows, each with a different combination of the 3. Here's my code</p> <pre><code> Type excelType = Type.GetTypeFromProgID("Excel.Application"); dynamic excel = Activator.CreateInstance(excelType); excel.visible = true; excel.Workbooks.Add(); Random rnd = new Random(); dynamic sheet = excel.ActiveSheet; for (int i = 1; i &lt;= 500; i++) { sheet.Cells[i, "A"] = rnd.Next(1,50); sheet.Cells[i, "B"] = rnd.Next(1,50); sheet.Cells[i, "C"] = RandomDay(); </code></pre> <p><strong>//</strong> this is where I'd check if a combination exists and if it does assign a new one</p> <pre><code> for (int j = 0; j &lt;= i + 1; j++) { if ( sheet.Cells[j + 1, "A"] == sheet.Cells[i, "A"] &amp;&amp; sheet.Cells[j + 1, "B"] == sheet.Cells[i, "B"] &amp;&amp; sheet.Cells[j + 1, "C"] == sheet.Cells[i, "C"]) { sheet.Cells[i, "A"] = rnd.Next(1,50); sheet.Cells[i, "B"] = rnd.Next(1,50); sheet.Cells[i, "C"] = RandomDay(); } } } } </code></pre> <p>// random date method</p> <pre><code> public static DateTime RandomDay() { DateTime start = new DateTime(2006, 1, 1); DateTime end = new DateTime(2013, 12, 31); Random gen = new Random(); int range = (end - start).Days; return start.AddDays(gen.Next(range)); } </code></pre> <p>I'm really not sure if this would work, plus it's running slow, it has to iterate over and over again to check if the combination exists. Does anyone have a better and faster solution? Thank you all!</p>
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    1. COWritting from my mobile so I can't write much. Define a range (range=sheet.Range ("A1:D20")) and then assign a 2 dimensional array to its value (range.Value=array)
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      1. USDalibor Čarapić
 

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