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POFastest way to interface between live (unsaved) Excel data and C# objects
 

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    <p>I want to know what the fastest way is of reading and writing data to and from an open Excel workbook to c# objects. The background is that I want to develop a c# application that is used from Excel and uses data held in excel. </p> <p>The business logic will reside in the c# application but the data will reside in an Excel workbook. The user will be using Excel and will click a button (or do something similar) on the excel workbook to initiate the c# application. The c# application will then read data off the excel workbook, process the data, and then write data back to the excel workbook.<br> There may be numerous blocks of data that are required to be read off and written back to the excel workbook but they will normally be of a relatively small size, say 10 rows and 20 columns. Occasionally a large list of data may need to be processed, of the order of 50,000 rows and 40 columns.</p> <p>I know that this is relatively easy to do say using VSTO but I want to know what the fastest (but still robust and elegant) solution is and get an idea of the speed. I don't mind if the solution recommends using third party products or uses C++.</p> <p>The obvious solution is using VSTO or interop but I don't know what the performance is like versus VBA which I'm currently using to read in the data, or if there are any other solutions.</p> <p>This was posted on experts exchange saying that VSTO was dramatically slower than VBA but that was a couple of years ago and I don't know if the performance has improved.</p> <p><a href="http://www.experts-exchange.com/Microsoft/Development/VSTO/Q_23635459.html" rel="noreferrer">http://www.experts-exchange.com/Microsoft/Development/VSTO/Q_23635459.html</a></p> <p>Thanks.</p>
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