.Net 导出excel的若干种方法

1.把web上的DataGrid直接导入到excel

public void ExportToExcel(System.Web.UI.Control ctl) 
        { 
            bool CurrCtlVisible=ctl.Visible;
            ctl.Visible=true;        Response.AppendHeader("Content-Disposition","attachment;filename=Excel.xls");  
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            Response.ContentType = "application/ms-excel"; 
            ctl.Page.EnableViewState = false; 
            System.IO.StringWriter tw = new System.IO.StringWriter(); 
            System.Web.UI.HtmlTextWriter hw = new HtmlTextWriter(tw); 
            ctl.RenderControl(hw); 
            Response.Write(tw.ToString()); 
            Response.End(); 
            
            ctl.Page.EnableViewState = true; 
            ctl.Visible=CurrCtlVisible;
        }

2.在引用里调用Microsoft.Office.Interop.Excel.dll，原理是把数据存到DataTable、DataView或DataGrid中，然后再把数据一格一格的赋到excel的cell里去。
见如下代码：

public class ExportToExcel
    {

        私有成员#region 私有成员
        // 数据的DataView
        private DataView dv=null;

        // 表格标题
        private string title=null;

        // 输出文件路径
        private string outFilePath=null;

 
        // 输入文件名
        private string inputFilePath=System.Windows.Forms.Application.StartupPath+@" emplate.xls";

        #endregion

        公共属性#region 公共属性
        /**//// <summary>
        /// 数据的DataView
        /// </summary>
        public DataView DV
        {
            set
            {
                dv=value;
            }
        }

        /**//// <summary>
        /// 表格标题
        /// </summary>
        public string Title
        {
            set
            {
                title=value;
            }
            get
            {
                return title;
            }
        }

        /**//// <summary>
        /// 输出文件路径
        /// </summary>
        public string OutFilePath
        {
            set
            {
                outFilePath=value;
            }
            get
            {
                return outFilePath;
            }
        }

        /**//// <summary>
        /// 输入文件路径
        /// </summary>
        private string InputFilePath
        {
            set
            {
                inputFilePath=value;
            }
            get
            {
                return inputFilePath;
            }
        }

        #endregion       

        构造函数#region 构造函数

        public ExportToExcel()
        {
        }

//        public OutputExcel(DataView dv,string title)
//        {
//
//        }

        #endregion

        公共方法#region 公共方法
        /**///
        public void CreateExcel()
        {
            int rowIndex=4;//行起始坐标
            int colIndex=1;//列起始坐标

            ApplicationClass myApp=null;
            Workbook myBook=null;
            Worksheet mySheet=null;

            //如果文件不存在，则将模板文件拷贝一份作为输出文件
            if(!File.Exists(outFilePath))
            {
                File.Copy(inputFilePath,outFilePath,true);
            }

            myApp= new ApplicationClass();
            myApp.Visible=false;
            object oMissiong=System.Reflection.Missing.Value;
            myApp.Workbooks.Open(outFilePath,oMissiong,oMissiong,oMissiong,oMissiong,
                oMissiong,oMissiong,oMissiong,oMissiong,oMissiong,oMissiong,oMissiong,
                oMissiong,oMissiong,oMissiong);
            myBook=myApp.Workbooks[1];
            mySheet=(Worksheet)myBook.ActiveSheet;

            //取得标题
            foreach(DataColumn col in dv.Table.Columns)
            {
                colIndex++;
                mySheet.Cells[4,colIndex] = col.ColumnName;
                mySheet.get_Range(mySheet.Cells[4,colIndex],mySheet.Cells[4,colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置标题格式为居中对齐
            }

            //取得表格中的数据
            foreach(DataRowView row in dv)
            {
                rowIndex ++;
                colIndex = 1;
                foreach(DataColumn col in dv.Table.Columns)
                {
                    colIndex ++;
                    if(col.DataType == System.Type.GetType("System.DateTime"))
                    {
                        mySheet.Cells[rowIndex,colIndex] = (Convert.ToDateTime(row[col.ColumnName].ToString())).ToString("yyyy-MM-dd");
                        mySheet.get_Range(mySheet.Cells[rowIndex,colIndex],mySheet.Cells[rowIndex,colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置日期型的字段格式为居中对齐
                    }
                    else  if(col.DataType == System.Type.GetType("System.String"))
                    {
                        mySheet.Cells[rowIndex,colIndex] = "'"+row[col.ColumnName].ToString();
                        mySheet.get_Range(mySheet.Cells[rowIndex,colIndex],mySheet.Cells[rowIndex,colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter;//设置字符型的字段格式为居中对齐
                    }
                    else
                    {
                        mySheet.Cells[rowIndex,colIndex] = row[col.ColumnName].ToString();
                    }
                }
            }

            //加载一个合计行
            int rowSum = rowIndex + 1;
            int colSum = 2;
            mySheet.Cells[rowSum,2] = "合计";
            mySheet.get_Range(mySheet.Cells[rowSum,2],mySheet.Cells[rowSum,2]).HorizontalAlignment = XlHAlign.xlHAlignCenter;

            //设置选中的部分的颜色
            mySheet.get_Range(mySheet.Cells[rowSum,colSum],mySheet.Cells[rowSum,colIndex]).Select();
            mySheet.get_Range(mySheet.Cells[rowSum,colSum],mySheet.Cells[rowSum,colIndex]).Interior.ColorIndex = 19;//设置为浅黄色，共计有56种

            //取得整个报表的标题
            mySheet.Cells[2,2] = title;

            //设置整个报表的标题格式
            mySheet.get_Range(mySheet.Cells[2,2],mySheet.Cells[2,2]).Font.Bold = true;
            mySheet.get_Range(mySheet.Cells[2,2],mySheet.Cells[2,2]).Font.Size = 22;

            //设置报表表格为最适应宽度
            mySheet.get_Range(mySheet.Cells[4,2],mySheet.Cells[rowSum,colIndex]).Select();
            mySheet.get_Range(mySheet.Cells[4,2],mySheet.Cells[rowSum,colIndex]).Columns.AutoFit();

            //设置整个报表的标题为跨列居中
            mySheet.get_Range(mySheet.Cells[2,2],mySheet.Cells[2,colIndex]).Select();
            mySheet.get_Range(mySheet.Cells[2,2],mySheet.Cells[2,colIndex]).HorizontalAlignment = XlHAlign.xlHAlignCenterAcrossSelection;

            //绘制边框
            mySheet.get_Range(mySheet.Cells[4,2],mySheet.Cells[rowSum,colIndex]).Borders.LineStyle = 1;
            mySheet.get_Range(mySheet.Cells[4,2],mySheet.Cells[rowSum,2]).Borders[XlBordersIndex.xlEdgeLeft].Weight = XlBorderWeight.xlThick;//设置左边线加粗
            mySheet.get_Range(mySheet.Cells[4,2],mySheet.Cells[4,colIndex]).Borders[XlBordersIndex.xlEdgeTop].Weight = XlBorderWeight.xlThick;//设置上边线加粗
            mySheet.get_Range(mySheet.Cells[4,colIndex],mySheet.Cells[rowSum,colIndex]).Borders[XlBordersIndex.xlEdgeRight].Weight = XlBorderWeight.xlThick;//设置右边线加粗
            mySheet.get_Range(mySheet.Cells[rowSum,2],mySheet.Cells[rowSum,colIndex]).Borders[XlBordersIndex.xlEdgeBottom].Weight = XlBorderWeight.xlThick;//设置下边线加粗
            myBook.Save();
            myBook.Close( true,outFilePath,true);

            System.Runtime.InteropServices.Marshal.ReleaseComObject(mySheet);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(myBook);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(myApp);

            myApp.Quit();
            GC.Collect();
        }
        #endregion

        
    }

3.另外，这就是另外一种方法了，建一个SqlServer的数据源，利用Excel的外部数据源让Excel自己从数据库取数据：

public void ExportToExcel(string pstrSql)
        {
            Excel.Application pApplication;
            Excel._Workbook xBk;
            Excel._Worksheet xSt;
            Excel._QueryTable xQt;
            string ExcelConn = "ODBC;DRIVER=SQL Server;SERVER=localhost;UID=sa;PWD=;APP=Microsoft(R) Windows (R) 2000 Operating System;WSID=me;DATABASE=pubs";
            pApplication = new Excel.ApplicationClass();
            xBk = pApplication.Workbooks.Add(true);
            xSt = (Excel._Worksheet)xBk.ActiveSheet;
            pApplication.Cells[2,2] = this.title;

            xSt.get_Range(pApplication.Cells[2,2],pApplication.Cells[2,2]).Font.Bold = true;
            xSt.get_Range(pApplication.Cells[2,2],pApplication.Cells[2,2]).Font.Name = "黑体";
            xSt.get_Range(pApplication.Cells[2,2],pApplication.Cells[2,2]).Font.Size = 22;
            xQt = xSt.QueryTables.Add(ExcelConn,xSt.get_Range(pApplication.Cells[4,2],pApplication.Cells[4,2]),pstrSql);
            xQt.Name = "导出EXCEL";
            xQt.FieldNames = true;
            xQt.RowNumbers = false;
            xQt.FillAdjacentFormulas = false;
            xQt.PreserveFormatting = false;
            xQt.BackgroundQuery = true;
            xQt.RefreshStyle = Excel.XlCellInsertionMode.xlInsertDeleteCells;
            xQt.AdjustColumnWidth = true;
            xQt.RefreshPeriod = 0;
            xQt.PreserveColumnInfo = true;
            xQt.Refresh(xQt.BackgroundQuery);
            pApplication.Visible = true;
        }

这里的pstrSql指的是sql语句。