C# Excel Interop Slow when looping through cells

Question

I am trying to extract all text data from an Excel document in C# and am having performance issues. In the following code I open the Workbook, loop over all worksheets, and loop

Answer 1

I use this function. The loops are only for converting to array starting at index 0, the main work is done in object[,] tmp = range.Value.

public object[,] GetTable(int row, int col, int width, int height)
{
    object[,] arr = new object[height, width];

    Range c1 = (Range)Worksheet.Cells[row + 1, col + 1];
    Range c2 = (Range)Worksheet.Cells[row + height, col + width];
    Range range = Worksheet.get_Range(c1, c2);

    object[,] tmp = range.Value;

    for (int i = 0; i < height; ++i)
    {
        for (int j = 0; j < width; ++j)
        {
            arr[i, j] = tmp[i + tmp.GetLowerBound(0), j + tmp.GetLowerBound(1)];
        }
    }                 

    return arr;
}