C#实现Excel与DataTable的数据互转的代码示例

using Spire.Xls;
using System.Data;

namespace ExcelToDataTable
{
    class Program
    {
        static void Main(string[] args)
        {
            // 创建Workbook的实例
            Workbook wb = new Workbook();

            // 载入Excel文件
            wb.LoadFromFile("Sample.xlsx");

            // 获取一个工作表
            Worksheet sheet = wb.Worksheets[0];

            // 创建一个DataTable实例
            DataTable dataTable = new DataTable();

            // 将第一行作为列名添加到DataTable
            for (int col = 1; col <= sheet.AllocatedRange.ColumnCount; col++)
            {
                if (sheet.AllocatedRange[1, col].Value != null)
                {
                    dataTable.Columns.Add(sheet.AllocatedRange[1, col].Value);
                }
            }

            // 遍历其余行并将数据添加到DataTable
            for (int row = 2; row <= sheet.AllocatedRange.RowCount; row++)
            {
                DataRow dataRow = dataTable.NewRow();
                for (int col = 1; col <= sheet.AllocatedRange.ColumnCount; col++)
                {
                    if (sheet.AllocatedRange[row, col].Value != null)
                    {
                        dataRow[col - 1] = sheet.AllocatedRange[row, col].Value;
                    }
                }
                dataTable.Rows.Add(dataRow);
            }

            // 输出列名
            foreach (DataColumn column in dataTable.Columns)
            {
                Console.Write(column.ColumnName + "\t");
            }
            Console.WriteLine();

            // 输出数据行
            foreach (DataRow row in dataTable.Rows)
            {
                foreach (var item in row.ItemArray)
                {
                    Console.Write(item + "\t");
                }
                Console.WriteLine();
            }
        }
    }
}

using Spire.Xls;
using System.Data;

namespace DataTableToExcel
{
    class Program
    {
        static void Main(string[] args)
        {
            // 定义数据列表并创建一个DataTable实例
            string[,] data = new string[,]
            {
                { "Product", "Quantity", "SalesAmount" },
                { "Product A", "100", "5000.0" },
                { "Product B", "150", "7500.0" },
                { "Product C", "200", "10000.0" },
                { "Product D", "120", "6000.0" },
                { "Product E", "180", "9000.0" }
            };
            DataTable dataTable = new DataTable();
            // 获取列数
            int columnCount = data.GetLength(1);
            // 添加列
            for (int col = 0; col < columnCount; col++)
            {
                dataTable.Columns.Add(data[0, col]);
            }
            // 添加数据行
            for (int row = 1; row < data.GetLength(0); row++)
            {
                DataRow dataRow = dataTable.NewRow();
                for (int col = 0; col < columnCount; col++)
                {
                    dataRow[col] = data[row, col];
                }
                dataTable.Rows.Add(dataRow);
            }

            // 创建Workbook的实例
            Workbook workbook = new Workbook();

            // 清除默认工作表并添加一个工作表
            workbook.Worksheets.Clear();
            Worksheet sheet = workbook.Worksheets.Add("SalesReport");

            // 写入列名
            for (int col = 0; col < columnCount; col++)
            {
                sheet.Range[1, col + 1].Value = dataTable.Columns[col].ColumnName;
            }

            // 写入数据行
            for (int row = 0; row < dataTable.Rows.Count; row++)
            {
                for (int col = 0; col < columnCount; col++)
                {
                    sheet.Range[row + 2, col + 1].Value = dataTable.Rows[row][col].ToString();
                }
            }

            // 保存到文件
            workbook.SaveToFile("output/DataTableToExcel.xlsx", FileFormat.Version2016);
            workbook.Dispose();
        }
    }
}