How Can I Efficiently Write a DataTable Array to an Excel Range Without Overwriting Cells?

Efficiently Writing a DataTable to Excel without Overwriting

Transferring data from arrays to Excel ranges often presents challenges, particularly the risk of overwriting cells with the array's first element. The following approach demonstrates how to write a DataTable to an Excel range effectively, avoiding this common pitfall.

This example converts a DataTable into a two-dimensional array and then writes it to the worksheet:

<code class="language-csharp">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];
    }
}
range.Value2 = arr;</code>

Here, the arr array is populated cell by cell from the dt DataTable. The range object specifies the destination range within the Excel worksheet. The Value2 property efficiently transfers the array's contents to the specified range in a single operation.

While this method effectively addresses the cell overwrite problem, it's crucial to acknowledge that the initial data conversion to an array might not always be the most optimal solution in terms of performance, especially for very large DataTables. Alternative, potentially more efficient, methods may exist depending on the specific context and data size.

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