Excel数据导入导出

1、将sql数据库表中的数据导入到Excel表格里：

方法一、使用StreamWrite对象，这里要注意的是

用“ ”换列，StreamWrite对象的WriteLine方法 一行一行写入。

public static void ImportExcel()
{
DataAccess services = new DataAccess();
string sql = @"SELECT [Id]
,[Name]
,[Age]
,[Sex]
FROM [StudentManager].[dbo].[Student]";

DataTable dt = services.ExeDataTable(sql, CommandType.Text);
if (dt != null && dt.Rows.Count > 0)
{

using (StreamWriter sw = new StreamWriter(@"D:123 est.xls", false, Encoding.UTF8))
{
string head = String.Empty;
foreach (var c in dt.Columns)
{
head += c.ToString() + " ";
}
sw.WriteLine(head);

foreach (DataRow row in dt.Rows)
{
sw.WriteLine(row["Id"] + " " + row["Name"] + " " + row["Age"] + " " + row["Sex"]);
}
}
}

}

方法二、使用第三方类库：

需要引入：AppLibrary.dll和Interop.Excel.dll（Com组件）两个dll

C#读取Excel 几种方法的体会

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Collections.Generic;
using AppLibrary.WriteExcel;
using Excel;

/// <summary>
///ExcelHelp 的摘要说明
/// </summary>
public class ExcelHelp
{
    public ExcelHelp()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }
    
    /**/
    /// <summary>
    /// ASP.NET，分Sheet导出Excel文件
    /// </summary>
    /// <param name="dv">用于导出的DataView</param>
    /// <param name="tmpExpDir">导出的文件夹，例如~/ExcelDownload/</param>
    /// <param name="refFileName">文件名，例如test.xls</param>
    /// <param name="sheetName">Sheet的名称，如果导出多个Sheet，会自动在名称后面加1、2、3</param>
    /// <param name="sheetSize">每个Sheet包含的数据行数，此数值不包括标题行。所以，对于65536行数据，请将此值设置为65535</param>
    /// <param name="setBorderLine">导出完成后，是否给数据加上边框线</param>
    public static void WebExportToExcel(DataView dv, string tmpExpDir, string refFileName, string sheetName, int sheetSize, bool setBorderLine)
    {
        //设置多少行为一个Sheet
        int RowsToDivideSheet = sheetSize;
        //计算Sheet数
        int sheetCount = (dv.Table.Rows.Count - 1) / RowsToDivideSheet + 1;

        GC.Collect();
        Application excel;
        _Workbook xBk;
        _Worksheet xSt = null;
        excel = new Application();
        xBk = excel.Workbooks.Add(true);

        //申明循环中要使用的变量
        int dvRowStart;
        int dvRowEnd;
        int rowIndex = 0;
        int colIndex = 0;

        //对全部Sheet进行操作
        for (int sheetIndex = 0; sheetIndex < sheetCount; sheetIndex++)
        {
            //初始化Sheet中的变量
            rowIndex = 1;
            colIndex = 1;
            //计算起始行
            dvRowStart = sheetIndex * RowsToDivideSheet;
            dvRowEnd = dvRowStart + RowsToDivideSheet - 1;
            if (dvRowEnd > dv.Table.Rows.Count - 1)
            {
                dvRowEnd = dv.Table.Rows.Count - 1;
            }

            //创建一个Sheet
            if (null == xSt)
            {
                xSt = (_Worksheet)xBk.Worksheets.Add(Type.Missing, Type.Missing, 1, Type.Missing);
            }
            else
            {
                xSt = (_Worksheet)xBk.Worksheets.Add(Type.Missing, xSt, 1, Type.Missing);
            }

            //设置SheetName
            xSt.Name = sheetName;
            if (sheetCount > 1)
            {
                xSt.Name += ((int)(sheetIndex + 1)).ToString();
            }

            //取得标题
            foreach (DataColumn col in dv.Table.Columns)
            {
                //设置标题格式
                xSt.get_Range(excel.Cells[rowIndex, colIndex], excel.Cells[rowIndex, colIndex]).HorizontalAlignment = XlVAlign.xlVAlignCenter; //设置标题居中对齐
                xSt.get_Range(excel.Cells[rowIndex, colIndex], excel.Cells[rowIndex, colIndex]).Font.Bold = true;
                //填值，并进行下一列
                excel.Cells[rowIndex, colIndex++] = col.ColumnName;
            }

            //取得表格中数量
            int drvIndex;
            for (drvIndex = dvRowStart; drvIndex <= dvRowEnd; drvIndex++)
            {
                DataRowView row = dv[drvIndex];
                //新起一行，当前单元格移至行首
                rowIndex++;
                colIndex = 1;
                foreach (DataColumn col in dv.Table.Columns)
                {

                    if (col.DataType == System.Type.GetType("System.DateTime"))
                    {
                        //excel.Cells[rowIndex, colIndex] = (Convert.ToDateTime(row[col.ColumnName].ToString())).ToString("yyyy-MM-dd");
                        excel.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
                    }
                    else if (col.DataType == System.Type.GetType("System.String"))
                    {
                        excel.Cells[rowIndex, colIndex] = "'" + row[col.ColumnName].ToString();
                    }
                    else
                    {
                        excel.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
                    }
                    colIndex++;

                }
            }
            //使用最佳宽度
            Range allDataWithTitleRange = xSt.get_Range(excel.Cells[1, 1], excel.Cells[rowIndex, colIndex - 1]);
            allDataWithTitleRange.Select();
            allDataWithTitleRange.Columns.AutoFit();
            //xSt.get_Range(excel.Cells[1, 1], excel.Cells[rowIndex, colIndex-1]).Columns.AutoFit();
            if (setBorderLine)
            {
                allDataWithTitleRange.Borders.LineStyle = 1;
            }
        }

        //G:LANSUNWebAdminUserSysManager100
        //excel.Visible = true;
        string absFileName = HttpContext.Current.Server.MapPath(System.IO.Path.Combine(tmpExpDir, refFileName));
        xBk.SaveCopyAs(absFileName);

        xBk.Close(false, null, null);

        excel.Quit();
        System.Runtime.InteropServices.Marshal.ReleaseComObject(xBk);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(xSt);

        xBk = null;
        excel = null;
        xSt = null;
        GC.Collect();
    }


    /// <summary>
    /// 导出Excel
    /// </summary>
    /// <param name="dv"></param>
    /// <param name="SheetRows"></param>
    /// <param name="Columns"></param>
    /// <param name="ColumnName"></param>
    /// <param name="ExportNo"></param>
    public static void ToExcel(DataView dv, int SheetRows, string ExportNo, HttpResponse response)
    {
        //GC.Collect();
        AppLibrary.WriteExcel.XlsDocument doc = new AppLibrary.WriteExcel.XlsDocument();

        doc.FileName = ExportNo + ".xls";
        string SheetName = string.Empty;
        //记录条数
        int mCount = dv.Count;

        //每个SHEET的数量
        int inv = SheetRows;
        //计算当前多少个SHEET
        int k = Convert.ToInt32(Math.Round(Convert.ToDouble(mCount / inv))) + 1;


        for (int i = 0; i < k; i++)
        {
            SheetName = "数据表" + i.ToString();
            AppLibrary.WriteExcel.Worksheet sheet = doc.Workbook.Worksheets.Add(SheetName);
            AppLibrary.WriteExcel.Cells cells = sheet.Cells;


            //创建列样式创建列时引用
            XF cellXF = doc.NewXF();
            cellXF.VerticalAlignment = VerticalAlignments.Centered;
            cellXF.HorizontalAlignment = HorizontalAlignments.Centered;
            cellXF.Font.FontFamily = FontFamilies.Roman;//设置字体 默认为宋体        
            for (int ColIndex = 0; ColIndex < dv.Table.Columns.Count; ColIndex++)
            {
                //第一行表头
                cells.Add(1, ColIndex + 1, dv.Table.Columns[ColIndex].Caption, cellXF);
            }
            //for (int ColIndex = 0; ColIndex < Columns.Count; ColIndex++)
            //{
            //    //第一行表头
            //    cells.Add(1, ColIndex + 1, Columns[ColIndex].ToString(), cellXF);
            //}
            int f = 1;
            for (int m = i * inv; m < mCount && m < (i + 1) * inv; m++)
            {
                f++;
                //循环主体内容
                //for (int CellIndex = 0; CellIndex < ColumnName.Count; CellIndex++)
                //{                    
                //    cells.Add(f, CellIndex + 1, dv.Table.Rows[m][ColumnName[CellIndex].ToString()].ToString(), cellXF);
                //}
                for (int CellIndex = 0; CellIndex < dv.Table.Columns.Count; CellIndex++)
                {
                    cells.Add(f, CellIndex + 1, dv.Table.Rows[m][dv.Table.Columns[CellIndex].ColumnName] is DBNull ? "" : dv.Table.Rows[m][dv.Table.Columns[CellIndex].ColumnName], cellXF);
                }
            }
        }
        //添加合计
        //AppLibrary.WriteExcel.Worksheet sheetq = doc.Workbook.Worksheets.Add("合计");
        //AppLibrary.WriteExcel.Cells cellsq = sheetq.Cells;
        //cellsq.Add(1, 1, "合计数据条数");
        //cellsq.Add(1, 2, mCount);
        //
        doc.Send();
        response.Flush();
        response.End();
    }

    public static void ToSeveralExcel(DataSet ds, string ExportNo, HttpResponse response, string[] sheetNames, int eachSheetCount)
    {
        //GC.Collect();
        AppLibrary.WriteExcel.XlsDocument doc = new AppLibrary.WriteExcel.XlsDocument();

        doc.FileName = ExportNo + ".xls";
        string SheetName = string.Empty;
        //记录条数
        int mCount = ds.Tables[0].Rows.Count;

        for (int i = 0; i < sheetNames.Length; i++)
        {
            SheetName = sheetNames[i];
            AppLibrary.WriteExcel.Worksheet sheet = doc.Workbook.Worksheets.Add(SheetName);
            AppLibrary.WriteExcel.Cells cells = sheet.Cells;

            //创建列样式创建列时引用
            XF cellXF = doc.NewXF();
            cellXF.VerticalAlignment = VerticalAlignments.Centered;
            cellXF.HorizontalAlignment = HorizontalAlignments.Centered;
            cellXF.Font.FontFamily = FontFamilies.Roman;//设置字体 默认为宋体        
            for (int ColIndex = 0; ColIndex < ds.Tables[0].Columns.Count; ColIndex++)
            {
                //第一行表头
                cells.Add(1, ColIndex + 1, ds.Tables[0].Columns[ColIndex].Caption, cellXF);
            }

            int f = 1;
            var thisSheetCount = i == 0 ? eachSheetCount : (mCount - i * eachSheetCount);
            for (int m = 0; m < thisSheetCount; m++)
            {
                f++;
                var thisrowCount = (i * eachSheetCount) + m;
                for (int CellIndex = 0; CellIndex < ds.Tables[0].Columns.Count; CellIndex++)
                {
                    cells.Add(f, CellIndex + 1, ds.Tables[0].Rows[thisrowCount][ds.Tables[0].Columns[CellIndex].ColumnName].ToString(), cellXF);
                }
            }
        }

        doc.Send();
        response.Flush();
        response.End();
    }


    #region 读写Excel
    /// <summary>
    /// 读取Excel数据
    /// </summary>
    /// <param name="FileName"></param>
    public static void Read(string FileName)
    {
        AppLibrary.ReadExcel.Workbook workbook = null;
        workbook = AppLibrary.ReadExcel.Workbook.getWorkbook(FileName);
        int k = 0;
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        foreach (AppLibrary.ReadExcel.Sheet sheet in workbook.Sheets)
        {
            k++;
            sb.Append("当前为第" + k + "个Sheet<br/><br/>");
            sb.Append("<table class='scroll' cellpadding=0 cellspacing=0>");
            for (int iRow = 0; iRow < sheet.Rows; iRow++)
            {
                sb.Append("<tr>");
                sb.Append("<td>");
                sb.Append("当前为第" + (iRow + 1) + "行");
                sb.Append("</td>");
                for (int iCol = 0; iCol < sheet.Columns; iCol++)
                {
                    AppLibrary.ReadExcel.Cell cell = sheet.getCell(iCol, iRow);
                    object val = cell.Value;

                    string cellValue = (val != null) ? val.ToString() : "";

                    sb.Append("<td>");
                    sb.Append(cellValue);
                    sb.Append("</td>");

                }
                sb.Append("</tr>");
            }
            sb.Append("</table><br/><br/>");
        }
        HttpContext.Current.Response.Write(sb.ToString());

    }


    /// <summary>
    /// 
    /// </summary>
    /// <param name="ds">DataSet对象</param>
    /// <param name="ExportNo">保存的Excel文件名</param>
    /// <param name="response">当前的HttpResponse对象</param>
    /// <param name="sheetNames">Excel表格名  和 DadaSet对象中的表个数一一对应</param>
    public static void ToExcel(DataSet ds, string ExportNo, HttpResponseBase response, string[] sheetNames)
    {
        //GC.Collect();
        AppLibrary.WriteExcel.XlsDocument doc = new AppLibrary.WriteExcel.XlsDocument();

        doc.FileName = ExportNo + ".xls";
        string SheetName = string.Empty;
        int mCount = 0;

        for (int i = 0; i < sheetNames.Length; i++)
        {
            SheetName = sheetNames[i];
            //记录条数
            mCount = ds.Tables[0].Rows.Count;
            AppLibrary.WriteExcel.Worksheet sheet = doc.Workbook.Worksheets.Add(SheetName);
            AppLibrary.WriteExcel.Cells cells = sheet.Cells;

            //创建列样式创建列时引用
            XF cellXF = doc.NewXF();
            cellXF.VerticalAlignment = VerticalAlignments.Centered;
            cellXF.HorizontalAlignment = HorizontalAlignments.Centered;
            cellXF.Font.FontFamily = FontFamilies.Roman;//设置字体 默认为宋体        
            for (int ColIndex = 0; ColIndex < ds.Tables[i].Columns.Count; ColIndex++)
            {
                //第一行表头
                cells.Add(1, ColIndex + 1, ds.Tables[i].Columns[ColIndex].Caption, cellXF);
            }

            int f = 1;
            for (int m = 0; m < mCount; m++)
            {
                f++;

                for (int CellIndex = 0; CellIndex < ds.Tables[i].Columns.Count; CellIndex++)
                {
                    cells.Add(f, CellIndex + 1, ds.Tables[i].Rows[m][ds.Tables[i].Columns[CellIndex].ColumnName].ToString(), cellXF);
                }
            }
        }

        doc.Send();
        response.Flush();
        response.End();
    }

    #endregion
}