## CellsHelper.AddAddInFunction method

Add addin function.

```csharp
[Obsolete("Use WorksheetCollection.RegisterAddInFunction() methods instead.")]
[EditorBrowsable(EditorBrowsableState.Never)]
public static void AddAddInFunction(string function, int minCountOfParameters, 
    int maxCountOfParameters, ParameterType[] paramersType, ParameterType functionValueType)
```

| Parameter | Type | Description |
| --- | --- | --- |
| function | String | The function name. |
| minCountOfParameters | Int32 | Minimum number of parameters this function requires |
| maxCountOfParameters | Int32 | Maximum number of parameters this function allows. |
| paramersType | ParameterType[] | The excepted parameters type of the function |
| functionValueType | ParameterType | The function value type. |

### Remarks

NOTE: This member is now obsolete. Instead, please use WorksheetCollection.RegisterAddInFunction() methods. This method will be removed 12 months later since January 2022. Aspose apologizes for any inconvenience you may have experienced.

### Examples

```csharp
namespace AsposeCellsExamples
{
    using Aspose.Cells;
    using System;

    public class CellsHelperMethodAddAddInFunctionWithStringInt32Int32ParameterTypeDemo
    {
        public static void Run()
        {
            // Create a new workbook
            Workbook workbook = new Workbook();
            Worksheet worksheet = workbook.Worksheets[0];

            try
            {
                // Define parameters for AddAddInFunction
                string functionName = "CUSTOMFUNCTION";
                int minParams = 2;
                int maxParams = 4;
                ParameterType[] paramTypes = new ParameterType[] { ParameterType.Value, ParameterType.Reference };
                ParameterType returnType = ParameterType.Value;

                // Call the AddAddInFunction method
                CellsHelper.AddAddInFunction(functionName, minParams, maxParams, paramTypes, returnType);

                // Use the custom function in a cell
                worksheet.Cells["A1"].Formula = "=CUSTOMFUNCTION(5,B2)";
                worksheet.Cells["B2"].Value = 10;

                // Calculate formulas
                workbook.CalculateFormula();

                Console.WriteLine("AddAddInFunction executed successfully. Custom function added and used in A1.");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error executing AddAddInFunction method: {ex.Message}");
            }

            // Save the result
            workbook.Save("AddAddInFunctionDemo.xlsx");
        }
    }
}
```

### See Also

* enum [ParameterType](../../parametertype/)
* class [CellsHelper](../)
* namespace [Aspose.Cells](../../../aspose.cells/)
* assembly [Aspose.Cells](../../../)