using System;
using System.Data;
using System.Configuration;
using System.IO;
using org.in2bits.MyXls; //MyXls命名空间

/// <summary>
///DataToXSL 的摘要说明
/// </summary>
public class DataToXSL
{
    #region DataTable 转 Excel

    /// <summary>
    /// 生成XSL
    /// </summary>
    /// <param name="table">DataTable对象</param>
    /// <param name="path">保存路径(包含文件名)</param>
    /// <returns></returns>
    public static bool CreateXLS(DataTable table, string path)
    {
        return CreateXLS(table, path, true);
    }

    /// <summary>
    /// 生成XSL
    /// </summary>
    /// <param name="table">DataTable对象</param>
    /// <param name="path">保存路径(包含文件名)</param>
    /// <param name="overwrite">是否覆盖</param>
    /// <returns></returns>
    public static bool CreateXLS(DataTable table, string path, bool overwrite)
    {
        if (File.Exists(path) && !overwrite)
            return false;

        try
        {
            //1.创建xls对象
            XlsDocument xlsDoc = new XlsDocument();
            xlsDoc.FileName = Path.GetFileName(path);

            //2.创建表
            string sheetName = string.IsNullOrEmpty(table.TableName) ? "Sheet1" : table.TableName;
            Worksheet sheet = xlsDoc.Workbook.Worksheets.Add(sheetName);

            //3.创建行列,注意cellRow,cellColumn都必须>=1
            Cells cells = sheet.Cells;

            //3.1 添加字段名
            for (int col = 0; col < table.Columns.Count; col++)
            {
                Cell cell = cells.Add(1, col + 1, table.Columns[col].ColumnName);
                cell.Font.Weight = FontWeight.Bold;
            }

            //3.2 添加记录
            for (int row = 0; row < table.Rows.Count; row++)
            {
                for (int col = 0; col < table.Columns.Count; col++)
                {
                    cells.Add(row + 2, col + 1, string.IsNullOrEmpty(table.Rows[row][col].ToString()) ? "-" : table.Rows[row][col].ToString());
                }
            }

            //4.准备保存文件夹
            if (!Directory.Exists(Path.GetDirectoryName(path)))
                Directory.CreateDirectory(Path.GetDirectoryName(path));

            //5.保存
            xlsDoc.Save(Path.GetDirectoryName(path), overwrite);
        }
        catch
        {
            return false;
        }

        return true;
    }

    #endregion

    #region DataSet 转 Excel

    /// <summary>
    /// 生成XSL
    /// </summary>
    /// <param name="ds">DataSet对象</param>
    /// <param name="path">保存路径(包含文件名)</param>
    /// <returns></returns>
    public static bool CreateXLS(DataSet ds, string path)
    {
        return CreateXLS(ds, path, true);
    }

    /// <summary>
    /// 生成XSL
    /// </summary>
    /// <param name="ds">DataSet对象</param>
    /// <param name="path">保存路径(包含文件名)</param>
    /// <param name="overwrite">是否覆盖</param>
    /// <returns></returns>
    public static bool CreateXLS(DataSet ds, string path, bool overwrite)
    {
        if (File.Exists(path) && !overwrite)
            return false;

        try
        {
            //1.创建xls对象
            XlsDocument xlsDoc = new XlsDocument();
            xlsDoc.FileName = Path.GetFileName(path);

            for (int i = 0; i < ds.Tables.Count; i++)
            {
                //2.创建表
                string sheetName = string.IsNullOrEmpty(ds.Tables[i].TableName) ? "Sheet" + i.ToString() : ds.Tables[i].TableName;
                Worksheet sheet = xlsDoc.Workbook.Worksheets.Add(sheetName);

                //3.创建行列,注意cellRow,cellColumn都必须>=1
                Cells cells = sheet.Cells;

                //3.1 添加字段名
                for (int col = 0; col < ds.Tables[i].Columns.Count; col++)
                {
                    Cell cell = cells.Add(1, col + 1, ds.Tables[i].Columns[col].ColumnName);
                    cell.Font.Weight = FontWeight.Bold;
                }

                //3.2 添加记录
                for (int row = 0; row < ds.Tables[i].Rows.Count; row++)
                {
                    for (int col = 0; col < ds.Tables[i].Columns.Count; col++)
                    {
                        cells.Add(row + 2, col + 1, string.IsNullOrEmpty(ds.Tables[i].Rows[row][col].ToString()) ? "-" : ds.Tables[i].Rows[row][col].ToString());
                    }
                }
            }

            //4.准备保存文件夹
            if (!Directory.Exists(Path.GetDirectoryName(path)))
                Directory.CreateDirectory(Path.GetDirectoryName(path));

            //5.保存
            xlsDoc.Save(Path.GetDirectoryName(path), overwrite);
        }
        catch
        {
            return false;
        }

        return true;
    }

    #endregion

}

using (SqlConnection conn = new SqlConnection("server=(local);database=Northwind;uid=sa;password=sa;"))
{
    DataSet ds = new DataSet();

    using (SqlDataAdapter adapter = new SqlDataAdapter("Select * FROM Customers", conn))
    {
        DataTable table = new DataTable("Customers");
        adapter.Fill(table);
        ds.Tables.Add(table);
    }

    using (SqlDataAdapter adapter = new SqlDataAdapter("Select * FROM Employees", conn))
    {
        DataTable table = new DataTable("Employees");
        adapter.Fill(table);
        ds.Tables.Add(table);
    }

    using (SqlDataAdapter adapter = new SqlDataAdapter("Select * FROM Categories", conn))
    {
        DataTable table = new DataTable("Categories");
        adapter.Fill(table);
        ds.Tables.Add(table);
    }

    DataToXSL.CreateXLS(ds, @"f:\Northwind.xls");
}