How to Efficiently Write Arrays of Objects to Excel Ranges?

Write array to Excel range

In this issue, the user encounters a problem when trying to write an array of objects to an Excel range. The code almost runs, but each cell is filled with the value of the first item in the array.

After investigation, the user determined that the reverse process (reading values ​​from the worksheet into an array) works fine. However, for some reason writing to the area behaves differently.

To solve this problem, an experienced user suggested a method that converts the DataTable to an array and then writes the array to a range on the worksheet. The user can modify the top row variable to specify the desired starting row of the array.

Here is the code provided:

object[,] arr = new object[dt.Rows.Count, dt.Columns.Count];
for (int r = 0; r < dt.Rows.Count; r++)
{
    for (int c = 0; c < dt.Columns.Count; c++)
    {
        arr[r, c] = dt.Rows[r][c];
    }
}
worksheet.get_Range("A" + topRow, "Z" + (topRow + dt.Rows.Count -1)).Value2 = arr;

This method allows efficient writing of large arrays to Excel without the need for iterative writing cell by cell.

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