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How to: Create Array Formulas

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This example demonstrates how to create an array formula.

// Create an array formula that multiplies values contained in the cell range A2 through A11 
// by the corresponding cells in the range B2 through B11, 
// and displays the results in cells C2 through C11.
worksheet.Range["C2:C11"].ArrayFormula = "=A2:A11*B2:B11";

// Create an array formula that multiplies values contained in the cell range C2 through C11 by 2
// and displays the results in cells D2 through D11.
worksheet.Range["D2:D11"].ArrayFormula = "=C2:C11*2";

// Create an array formula that multiplies values contained in the cell range B2 through D11, 
// adds the results, and displays the total sum in cell D12.
worksheet.Cells["D12"].ArrayFormula = "=SUM(B2:B11*C2:C11*D2:D11)";

// Re-dimension an array formula range:
// delete the array formula and create a new range with the same formula.
if (worksheet.Cells["C13"].HasArrayFormula) {
    string af = worksheet.Cells["C13"].ArrayFormula;
    worksheet.Cells["C13"].GetArrayFormulaRange().ArrayFormula = string.Empty;
    worksheet.Range["C2:C11"].ArrayFormula = af;
}
See Also