วิธีการอัปเดตค่าเซลล์ Excel ในโปรแกรม C#

using Openize.Cells;
using System;

using Openize.Cells;

class CellUpdater
{
    public static void UpdateSingleCells()
    {
        using (var workbook = new Workbook("data.xlsx"))
        {
            var worksheet = workbook.Worksheets[0];
            
            // Update different data types
            worksheet.Cells["A1"].PutValue("Updated Text");
            worksheet.Cells["B1"].PutValue(12345);
            worksheet.Cells["C1"].PutValue(99.99);
            worksheet.Cells["D1"].PutValue(DateTime.Now);
            worksheet.Cells["E1"].PutValue(true);
            
            // Save changes
            workbook.Save();
            Console.WriteLine("Cells updated successfully!");
        }
    }
}

public static void UpdateMultipleCells()
{
    using (var workbook = new Workbook("report.xlsx"))
    {
        var worksheet = workbook.Worksheets[0];
        
        // Update headers
        string[] headers = {"Product", "Price", "Quantity", "Total"};
        for (int i = 0; i < headers.Length; i++)
        {
            worksheet.Cells[$"{GetColumnLetter(i + 1)}1"].PutValue(headers[i]);
        }
        
        // Update data rows
        string[,] data = {
            {"Laptop", "999.99", "5", "4999.95"},
            {"Mouse", "25.50", "10", "255.00"},
            {"Keyboard", "75.00", "3", "225.00"}
        };
        
        for (int row = 0; row < data.GetLength(0); row++)
        {
            for (int col = 0; col < data.GetLength(1); col++)
            {
                string cellRef = GetCellReference(row + 2, col + 1);
                worksheet.Cells[cellRef].PutValue(data[row, col]);
            }
        }
        
        workbook.Save();
        Console.WriteLine("Multiple cells updated!");
    }
}

static string GetCellReference(int row, int col)
{
    return $"{GetColumnLetter(col)}{row}";
}

static string GetColumnLetter(int columnNumber)
{
    string columnLetter = string.Empty;
    while (columnNumber > 0)
    {
        columnNumber--;
        columnLetter = (char)('A' + columnNumber % 26) + columnLetter;
        columnNumber /= 26;
    }
    return columnLetter;
}

public static void ConditionalUpdate()
{
    using (var workbook = new Workbook("sales.xlsx"))
    {
        var worksheet = workbook.Worksheets[0];
        
        // Read and update based on conditions
        for (int row = 2; row <= worksheet.GetRowCount(); row++)
        {
            string salesValue = worksheet.Cells[$"C{row}"].GetValue();
            
            if (double.TryParse(salesValue, out double sales))
            {
                // Update status based on sales amount
                if (sales > 10000)
                {
                    worksheet.Cells[$"D{row}"].PutValue("High Performer");
                }
                else if (sales > 5000)
                {
                    worksheet.Cells[$"D{row}"].PutValue("Good");
                }
                else
                {
                    worksheet.Cells[$"D{row}"].PutValue("Needs Improvement");
                }
            }
        }
        
        workbook.Save();
        Console.WriteLine("Conditional updates completed!");
    }
}

public static void BulkRangeUpdate()
{
    using (var workbook = new Workbook("template.xlsx"))
    {
        var worksheet = workbook.Worksheets[0];
        
        // Update a range of cells with the same value
        var range = worksheet.GetRange(1, 1, 1, 5); // A1:E1
        range.SetValue("HEADER");
        
        // Update a column with sequential values
        for (int row = 2; row <= 10; row++)
        {
            worksheet.Cells[$"A{row}"].PutValue($"Item {row - 1}");
            worksheet.Cells[$"B{row}"].PutValue(row * 100);
        }
        
        workbook.Save();
        Console.WriteLine("Bulk update completed!");
    }
}

using Openize.Cells;
using System.Collections.Generic;

public class Employee
{
    public string Name { get; set; }
    public string Department { get; set; }
    public double Salary { get; set; }
    public DateTime HireDate { get; set; }
}

public class EmployeeDataUpdater
{
    public static void UpdateEmployeeData()
    {
        var employees = new List<Employee>
        {
            new Employee { Name = "John Doe", Department = "IT", Salary = 75000, HireDate = new DateTime(2020, 1, 15) },
            new Employee { Name = "Jane Smith", Department = "HR", Salary = 65000, HireDate = new DateTime(2019, 3, 20) },
            new Employee { Name = "Mike Johnson", Department = "Finance", Salary = 80000, HireDate = new DateTime(2021, 6, 10) }
        };
        
        using (var workbook = new Workbook())
        {
            var worksheet = workbook.Worksheets[0];
            worksheet.Name = "Employee Data";
            
            // Set headers
            worksheet.Cells["A1"].PutValue("Name");
            worksheet.Cells["B1"].PutValue("Department");
            worksheet.Cells["C1"].PutValue("Salary");
            worksheet.Cells["D1"].PutValue("Hire Date");
            worksheet.Cells["E1"].PutValue("Years of Service");
            
            // Update employee data
            for (int i = 0; i < employees.Count; i++)
            {
                int row = i + 2;
                var emp = employees[i];
                
                worksheet.Cells[$"A{row}"].PutValue(emp.Name);
                worksheet.Cells[$"B{row}"].PutValue(emp.Department);
                worksheet.Cells[$"C{row}"].PutValue(emp.Salary);
                worksheet.Cells[$"D{row}"].PutValue(emp.HireDate);
                
                // Calculate years of service
                int yearsOfService = DateTime.Now.Year - emp.HireDate.Year;
                worksheet.Cells[$"E{row}"].PutValue(yearsOfService);
            }
            
            workbook.Save("UpdatedEmployeeData.xlsx");
            Console.WriteLine("Employee data updated successfully!");
        }
    }
}

public static void SafeUpdateCells(string filePath)
{
    try
    {
        using (var workbook = new Workbook(filePath))
        {
            var worksheet = workbook.Worksheets[0];
            
            // Validate before updating
            if (worksheet.GetRowCount() < 1 || worksheet.GetColumnCount() < 1)
            {
                Console.WriteLine("Worksheet is empty!");
                return;
            }
            
            // Safe update with validation
            string existingValue = worksheet.Cells["A1"].GetValue();
            if (!string.IsNullOrEmpty(existingValue))
            {
                worksheet.Cells["A1"].PutValue($"Updated: {existingValue}");
            }
            else
            {
                worksheet.Cells["A1"].PutValue("New Value");
            }
            
            workbook.Save();
            Console.WriteLine("Update completed successfully!");
        }
    }
    catch (FileNotFoundException)
    {
        Console.WriteLine("Excel file not found!");
    }
    catch (UnauthorizedAccessException)
    {
        Console.WriteLine("File is locked or you don't have permission!");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error updating cells: {ex.Message}");
    }
}