How to speed up dumping a DataTable into an Excel worksheet?

Question

I have the following routine that dumps a DataTable into an Excel worksheet.

    private void RenderDataTableOnXlSheet(DataTable dt, Excel.Worksheet xlWk,          


        

Answer 1

Interop is inherently very slow. There is a large overhead associated with each call. To speed it up try writing back an object array of data to a range of cells in one assignment statement.

Or if this is a serious problem try using one of the Managed Code Excel extensions that can read/write data using managed code via the XLL interface. (Addin Express, Managed XLL etc.)