ByteScout Data Extraction Suite – C# – Use custom functions with spreadsheet sdk

Home
/
Articles
/
ByteScout Data Extraction Suite – C# – Use custom functions with spreadsheet sdk

printable version:
ByteScout-Data-Extraction-Suite-C-sharp-Use-custom-functions-with-spreadsheet-sdk.pdf

How to use custom functions with spreadsheet sdk in C# with ByteScout Data Extraction Suite

If you want to learn more then this tutorial will show how to use custom functions with spreadsheet sdk in C#

Quickly learn how to use custom functions with spreadsheet sdk in C# with this sample source code. What is ByteScout Data Extraction Suite? It is the bundle that includes three SDK tools for data extraction from PDF, scans, images and from spreadsheets: PDF Extractor SDK, Data Extraction SDK, Barcode Reader SDK. It can help you to use custom functions with spreadsheet sdk in your C# application.

The following code snippet for ByteScout Data Extraction Suite works best when you need to quickly use custom functions with spreadsheet sdk in your C# application. Just copy and paste the code into your C# application’s code and follow the instructions. Want to see how it works with your data then code testing will allow the function to be tested and work properly.

You can download free trial version of ByteScout Data Extraction Suite from our website with this and other source code samples for C#.

On-demand (REST Web API) version:
Web API (on-demand version)

On-premise offline SDK for Windows:
60 Day Free Trial (on-premise)

Program.cs

      using System;
using System.Diagnostics;

using Bytescout.Spreadsheet;

namespace CustomFunctions
{
    /// <summary>
    /// This example demonstrates the calculation of custom functions.
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            // Create Spreadsheet instance
            Spreadsheet spreadsheet = new Spreadsheet();
            spreadsheet.RegistrationName = "demo";
            spreadsheet.RegistrationKey = "demo";

            // Load document
            spreadsheet.LoadFromFile(@"CustomFuncExample.xlsx");

            // Add custom formula handler
            spreadsheet.CustomFunctionsCallback = new CustomFunctionsCallback(MyFunctions);
            
            // Calculate the first worksheet
            Worksheet worksheet = spreadsheet.Workbook.Worksheets[0];
            worksheet.Calculate();

            // Save calculated values to neighbor cells to demonstrate custom functions are calculated
            worksheet["C2"].Value = worksheet["B2"].Value;
            worksheet["C3"].Value = worksheet["B3"].Value;
            worksheet["C4"].Value = worksheet["B4"].Value;

            // Save modified spreadsheet
            spreadsheet.SaveAs(@"result.xlsx");

            // Cleanup
            spreadsheet.Dispose();

            // Open saved spreadsheet in associated application (for demo purpose)
            Process.Start("result.xlsx");
        }

        public static object MyFunctions(string funcName, object[] args, ref bool handled)
        {
            // Handle "CUSTOMFUNC_FACTORIAL" function
            if (String.Compare(funcName, "CUSTOMFUNC_FACTORIAL", StringComparison.OrdinalIgnoreCase) == 0)
            {
                handled = true;

                // Compute factorial
                if (args.Length > 0)
                {
                    int value = (int)(double) args[0];

                    if (value == 0 || value == 1)
                        return 1;

                    int f = 1;
                    for (int i = 1; i <= value; i++)
                        f = f * i;

                    return f;
                }

                return null;
            }

            // Handle "CUSTOMFUNC_SUM" function
            if (string.Compare(funcName, "CUSTOMFUNC_SUM", StringComparison.OrdinalIgnoreCase) == 0)
            {
                handled = true;

                // Compute the sum of values
                if (args.Length > 0)
                {
                    double sum = 0;
                    foreach (var o in args)
                        sum += (double)o;

                    return sum;
                }

                return null;
            }

            return null;
        }
    }
}