强大的Excel文件的导入导出类

using System;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
using System.Data.OleDb;
using Microsoft.Office.Interop.Excel;
using System.Reflection; // For Missing.Value and BindingFlags
using System.Runtime.InteropServices; // For COMException
/// <summary>
///Excel 的摘要说明
/// </summary>
namespace harry
{
    public class Excel
    {
        #region 读取Excel文件转换成DataTable
 
        /// <summary>
        /// 读取Excel文件转换成DataTable
        /// </summary>
        /// <param name="excelPath">Excel文件路径</param>
        /// <param name="sheetName"></param>
        /// <returns></returns>
        public static System.Data.DataTable Import_Sheet(string excelPath, string sheetName) { return Import_Sql(excelPath, "select * from [" + sheetName + "$]"); }
 
        /// <summary>
        /// 读取Excel文件转换成DataTable
        /// </summary>
        /// <param name="excelPath">Excel文件路径</param>
        /// <param name="sql">Excel内查询语句</param>
        /// <returns></returns>
        public static System.Data.DataTable Import_Sql(string excelPath, string sql)
        {
            //string 2003 = "Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;data source=" + filepath;
            //string 2007 = "Provider=Microsoft.ACE.OLEDB.12.0;Extended Properties='Excel 12.0;HDR=YES';data source=" + fPath;//读EXCEL2003/excel2007
            OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties='Excel 8.0;HDR=YES;HDR=1;';data source=" + excelPath);
            OleDbDataAdapter odda = new OleDbDataAdapter(sql, conn);
            System.Data.DataTable dt = new System.Data.DataTable();
            try
            {
                conn.Open();
                odda.Fill(dt);
            }
            catch (Exception ex) { throw ex; }
            finally
            {
                conn.Close();
                conn.Dispose();
                odda.Dispose();
            }
            return dt;
        }
 
        #endregion
 
        #region 输出Excel文件
 
        #region 使用office组件输出
 
        public static void Export_Office(System.Data.DataTable dt) { Export_Office(dt, "", new Model.harry.ExcelInfo()); }
 
        public static void Export_Office(System.Data.DataTable dt, Model.harry.ExcelInfo model) { Export_Office(dt, "", model); }
 
        public static void Export_Office(System.Data.DataTable dt, string savePath) { Export_Office(dt, savePath, new Model.harry.ExcelInfo()); }
 
        /// <summary>
        /// 输出Excel文件
        /// </summary>
        /// <param name="dt">数据源</param>
        /// <param name="savePath">储存路径</param>
        /// <param name="ExcelInfo">Excel格式化信息对象</param>
        private static void Export_Office(System.Data.DataTable dt, string savePath, Model.harry.ExcelInfo model)
        {
            if (dt.Rows.Count > 0)
            {
                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
                Microsoft.Office.Interop.Excel._Worksheet format = (Microsoft.Office.Interop.Excel._Worksheet)excel.Application.Workbooks.Add(true).ActiveSheet;
 
                //设置行和列的索引
                int rowIndex = 1, colIndex = 0;
                //添加列名
                foreach (DataColumn col in dt.Columns)
                {
                    colIndex++;
                    excel.Cells[1, colIndex] = col.ColumnName;
                }
                //添加数据
                foreach (DataRow row in dt.Rows)
                {
                    rowIndex++;
                    colIndex = 0;
                    foreach (DataColumn col in dt.Columns)
                    {
                        colIndex++;
                        excel.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
                    }
                }
                if (model != null)
                {
                    //设置标题是否为粗体
                    format.get_Range(excel.Cells[1, 1], excel.Cells[1, colIndex]).Font.Bold = model.TitleBold;
 
                    Range range = format.get_Range(excel.Cells[1, 1], excel.Cells[rowIndex, colIndex]);
                    //设置字体大小
                    range.Font.Size = model.FontSize;
                    //设置列宽
                    if (model.Width == Model.harry.ExcelInfo.WidthType.auto) { range.Columns.AutoFit(); }
                    else if (model.Width == Model.harry.ExcelInfo.WidthType.size) { range.ColumnWidth = model.WidthSize; }
                    //设置对齐格式
                    if (model.Align == Model.harry.ExcelInfo.AlignType.left) { range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignLeft; }
                    else if (model.Align == Model.harry.ExcelInfo.AlignType.center) { range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter; }
                    else if (model.Align == Model.harry.ExcelInfo.AlignType.right) { range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignRight; }
                    else { }
 
                    if (model.Valign == Model.harry.ExcelInfo.ValignType.top) { range.VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignTop; }
                    else if (model.Valign == Model.harry.ExcelInfo.ValignType.middle) { range.VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter; }
                    else if (model.Valign == Model.harry.ExcelInfo.ValignType.bottom) { range.VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignBottom; }
                    else { }
                }
 
                //不可见，即后台处理
                excel.Visible = false;
                //设置禁止弹出保存的询问提示框
                excel.DisplayAlerts = false;
                ////设置禁止弹出覆盖的询问提示框
                //excel.AlertBeforeOverwriting = false;
 
                try
                {
                    if (savePath != "") { excel.ActiveWorkbook.SaveCopyAs(savePath); }
                    else
                    {
                        excel.Save(AppDomain.CurrentDomain.BaseDirectory + "bak.xls");
                        if (System.IO.File.Exists(AppDomain.CurrentDomain.BaseDirectory + "bak.xls")) System.IO.File.Delete(AppDomain.CurrentDomain.BaseDirectory + "bak.xls");
                    }
                }
                catch { }
 
                finally
                {
                    excel.Application.Workbooks.Close();
                    excel.Application.Quit();
                    excel.Quit();
                    //释放使用的Excel对象
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
                    GC.Collect();
                    KillExcel();
                }
            }
        }
 
        //删除执行过程中未释放的Excel线程
        private static void KillExcel()
        {
            System.Diagnostics.Process[] excelProcesses = System.Diagnostics.Process.GetProcessesByName("EXCEL");
            DateTime startTime = new DateTime();
 
            int processId = 0;
            for (int i = 0; i < excelProcesses.Length; i++)
            {
                if (startTime < excelProcesses[i].StartTime)
                {
                    startTime = excelProcesses[i].StartTime;
                    processId = i;
                }
            }
            if (excelProcesses[processId].HasExited == false) { excelProcesses[processId].Kill(); }
        }
 
        #endregion
 
        #region 使用DataGrid输出
 
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataGrid">DataGrid</param>
        public static void Export_DataGrid(DataGrid dg) { Export_DataGrid(dg, null, null, null, false); }
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataGrid">DataGrid</param>
        /// <param name="fileName">文件名称</param>
        public static void Export_DataGrid(DataGrid dg, string fileName) { Export_DataGrid(dg, null, fileName, null, false); }
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataGrid">DataGrid</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        public static void Export_DataGrid(DataGrid dg, string fileName, string formatCellIndex) { Export_DataGrid(dg, null, fileName, formatCellIndex, false); }
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataGrid">DataGrid</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        /// <param name="isWrite">是否直接输出到前台</param>
        /// <returns>Excel文件内容</returns>
        public static string Export_DataGrid(DataGrid dg, string fileName, string formatCellIndex, bool isWrite) { return Export_DataGrid(dg, null, fileName, formatCellIndex, isWrite); }
 
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        public static void Export_DataGrid(System.Data.DataTable dt) { Export_DataGrid(null, dt, null, null, false); }
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        /// <param name="fileName">文件名称</param>
        public static void Export_DataGrid(System.Data.DataTable dt, string fileName) { Export_DataGrid(null, dt, fileName, null, false); }
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        public static void Export_DataGrid(System.Data.DataTable dt, string fileName, string formatCellIndex) { Export_DataGrid(null, dt, fileName, formatCellIndex, false); }
        /// <summary>
        /// 使用DataGrid输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        /// <param name="isWrite">是否直接输出到前台</param>
        /// <returns>Excel文件内容</returns>
        public static string Export_DataGrid(System.Data.DataTable dt, string fileName, string formatCellIndex, bool isWrite) { return Export_DataGrid(null, dt, fileName, formatCellIndex, isWrite); }
 
        private static string Export_DataGrid(DataGrid dg, System.Data.DataTable dt, string fileName, string formatCellIndex, bool isWrite)
        {
            if (dg == null)
            {
                dg = new DataGrid();
                dg.DataSource = dt;
                dg.DataBind();
            }
            foreach (DataGridItem dgi in dg.Items)
            {
                for (int j = 0; j < dgi.Cells.Count; j++)
                {
                    if (formatCellIndex != null && formatCellIndex != "" && formatCellIndex.Contains("$" + j + "$")) dgi.Cells[j].Attributes.Add("style", "mso-number-format:'@';");
                }
            }
            if (fileName == null || fileName == "") { fileName = "Excel.xls"; }
 
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
            dg.RenderControl(new System.Web.UI.HtmlTextWriter(oStringWriter));
 
            if (isWrite) { return oStringWriter.ToString(); }
            else
            {
                //this.EnableViewState = false;
                HttpResponse response = System.Web.HttpContext.Current.Response;
                response.Clear();
                response.Buffer = true;
                response.ContentType = "application/vnd.ms-excel";
                response.Charset = "gb2312";
                response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
                response.AppendHeader("content-disposition", "attachment;fileName=\"" + fileName + "\"");
 
                response.Write(oStringWriter.ToString());
                response.End();
                return "";
            }
        }
 
        #endregion
 
        #region 使用GridView输出
 
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="GridView">GridView</param>
        public static void Export_GridView(GridView gv) { Export_GridView(gv, null, null, null, false); }
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="GridView">GridView</param>
        /// <param name="fileName">文件名称</param>
        public static void Export_GridView(GridView gv, string fileName) { Export_GridView(gv, null, fileName, null, false); }
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="GridView">GridView</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        public static void Export_GridView(GridView gv, string fileName, string formatCellIndex) { Export_GridView(gv, null, fileName, formatCellIndex, false); }
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="GridView">GridView</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        /// <param name="isWrite">是否直接输出到前台</param>
        /// <returns>Excel文件内容</returns>
        public static string Export_GridView(GridView gv, string fileName, string formatCellIndex, bool isWrite) { return Export_GridView(gv, null, fileName, formatCellIndex, isWrite); }
 
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        public static void Export_GridView(System.Data.DataTable dt) { Export_GridView(null, dt, null, null, false); }
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        /// <param name="fileName">文件名称</param>
        public static void Export_GridView(System.Data.DataTable dt, string fileName) { Export_GridView(null, dt, fileName, null, false); }
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        public static void Export_GridView(System.Data.DataTable dt, string fileName, string formatCellIndex) { Export_GridView(null, dt, fileName, formatCellIndex, false); }
        /// <summary>
        /// 使用GridView输出Excel文件
        /// </summary>
        /// <param name="DataTable">DataTable数据源</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="formatCellIndex">需要格式化的列集合，例如"$1$2$"为1,2列格式化为字符串</param>
        /// <param name="isWrite">是否直接输出到前台</param>
        /// <returns>Excel文件内容</returns>
        public static string Export_GridView(System.Data.DataTable dt, string fileName, string formatCellIndex, bool isWrite) { return Export_GridView(null, dt, fileName, formatCellIndex, isWrite); }
 
        private static string Export_GridView(GridView gv, System.Data.DataTable dt, string fileName, string formatCellIndex, bool isWrite)
        {
            if (gv == null)
            {
                gv = new GridView();
                gv.DataSource = dt;
                gv.DataBind();
            }
            foreach (GridViewRow gvr in gv.Rows)
            {
                for (int j = 0; j < gvr.Cells.Count; j++)
                {
                    if (formatCellIndex != null && formatCellIndex != "" && formatCellIndex.Contains("$" + j + "$")) gvr.Cells[j].Attributes.Add("style", "mso-number-format:'@';");
                }
            }
            if (fileName == null || fileName == "") { fileName = "Excel.xls"; }
 
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
            gv.RenderControl(new System.Web.UI.HtmlTextWriter(oStringWriter));
 
            if (isWrite) { return oStringWriter.ToString(); }
            else
            {
                //this.EnableViewState = false;
                HttpResponse response = System.Web.HttpContext.Current.Response;
                response.Clear();
                response.Buffer = true;
                response.ContentType = "application/vnd.ms-excel";
                response.Charset = "gb2312";
                response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
                response.AppendHeader("content-disposition", "attachment;fileName=\"" + fileName + "\"");
 
                response.Write(oStringWriter.ToString());
                response.End();
                return "";
            }
        }
 
        #endregion
 
        #endregion
    }
}
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原文地址：https://www.cnblogs.com/endsock/p/2022926.html