C#将DataTable海量数据导出到Excel .

将DataTable中的大量数据导出到Excel表格中。

但每张Excel表单只能有65536行，所以当DataTable数据多于65536行时，Excel要考虑分页功能。

通过查阅相关资料，得到导出方法。

代码在Office 2003 环境下通过。末验证其它Office版本。

[c-sharp] view plaincopyprint?

using Excel = Microsoft.Office.Interop.Excel;


public Excel.Application m_xlApp = null;


/// <summary>
/// 将DataTable数据导出到Excel表
/// </summary>
/// <param name="tmpDataTable">要导出的DataTable</param>
/// <param name="strFileName">Excel的保存路径及名称</param>
public void DataTabletoExcel(System.Data.DataTable tmpDataTable, string strFileName)
{
    if (tmpDataTable == null)
    {
        return;
    }
    long rowNum = tmpDataTable.Rows.Count;//行数
    int columnNum = tmpDataTable.Columns.Count;//列数
    Excel.Application m_xlApp = new Excel.Application();
    m_xlApp.DisplayAlerts = false;//不显示更改提示
    m_xlApp.Visible = false;

    Excel.Workbooks workbooks = m_xlApp.Workbooks;
    Excel.Workbook workbook = workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
    Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets[1];//取得sheet1

    try
    {
        if (rowNum > 65536)//单张Excel表格最大行数
        {
            long pageRows = 65535;//定义每页显示的行数,行数必须小于65536
            int scount = (int)(rowNum / pageRows);//导出数据生成的表单数
            if (scount * pageRows < rowNum)//当总行数不被pageRows整除时，经过四舍五入可能页数不准
            {
                scount = scount + 1;
            }
            for (int sc = 1; sc <= scount; sc++)
            {
                if (sc > 1)
                {
                    object missing = System.Reflection.Missing.Value;
                    worksheet = (Excel.Worksheet)workbook.Worksheets.Add(
                                missing, missing, missing, missing);//添加一个sheet
                }
                else
                {
                    worksheet = (Excel.Worksheet)workbook.Worksheets[sc];//取得sheet1
                }
                string[,] datas = new string[pageRows + 1, columnNum];

                for (int i = 0; i < columnNum; i++) //写入字段
                {
                    datas[0, i] = tmpDataTable.Columns[i].Caption;//表头信息
                }
                Excel.Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, columnNum]);
                range.Interior.ColorIndex = 15;//15代表灰色
                range.Font.Bold = true;
                range.Font.Size = 9;

                int init = int.Parse(((sc - 1) * pageRows).ToString());
                int r = 0;
                int index = 0;
                int result;
                if (pageRows * sc >= rowNum)
                {
                    result = (int)rowNum;
                }
                else
                {
                    result = int.Parse((pageRows * sc).ToString());
                }

                for (r = init; r < result; r++)
                {
                    index = index + 1;
                    for (int i = 0; i < columnNum; i++)
                    {
                        object obj = tmpDataTable.Rows[r][tmpDataTable.Columns[i].ToString()];
                        datas[index, i] = obj == null ? "" : "'" + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式
                    }
                    System.Windows.Forms.Application.DoEvents();
                    //添加进度条
                }

                Excel.Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[index + 1, columnNum]);
                fchR.Value2 = datas;
                worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。
                m_xlApp.WindowState = Excel.XlWindowState.xlMaximized;//Sheet表最大化
                range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[index + 1, columnNum]);
                //range.Interior.ColorIndex = 15;//15代表灰色
                range.Font.Size = 9;
                range.RowHeight = 14.25;
                range.Borders.LineStyle = 1;
                range.HorizontalAlignment = 1;
            }
        }
        else
        {
            string[,] datas = new string[rowNum + 1, columnNum];
            for (int i = 0; i < columnNum; i++) //写入字段
            {
                datas[0, i] = tmpDataTable.Columns[i].Caption;
            }
            Excel.Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, columnNum]);
            range.Interior.ColorIndex = 15;//15代表灰色
            range.Font.Bold = true;
            range.Font.Size = 9;

            int r = 0;
            for (r = 0; r < rowNum; r++)
            {
                for (int i = 0; i < columnNum; i++)
                {
                    object obj = tmpDataTable.Rows[r][tmpDataTable.Columns[i].ToString()];
                    datas[r + 1, i] = obj == null ? "" : "'" + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式
                }
                System.Windows.Forms.Application.DoEvents();
                //添加进度条
            }
            Excel.Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]);
            fchR.Value2 = datas;

            worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。
            m_xlApp.WindowState = Excel.XlWindowState.xlMaximized;

            range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]);
            //range.Interior.ColorIndex = 15;//15代表灰色
            range.Font.Size = 9;
            range.RowHeight = 14.25;
            range.Borders.LineStyle = 1;
            range.HorizontalAlignment = 1;
        }
        workbook.Saved = true;
        workbook.SaveCopyAs(strFileName);
    }
    catch (Exception ex)
    {
        MessageBox.Show("导出异常：" + ex.Message, "导出异常", MessageBoxButtons.OK, MessageBoxIcon.Warning);
    }
    finally
    {
        EndReport();
    }
}


/// <summary>
/// 退出报表时关闭Excel和清理垃圾Excel进程
/// </summary>
private void EndReport()
{
    object missing = System.Reflection.Missing.Value;
    try
    {
        m_xlApp.Workbooks.Close();
        m_xlApp.Workbooks.Application.Quit();
        m_xlApp.Application.Quit();
        m_xlApp.Quit();
    }
    catch { }
    finally
    {
        try
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp.Workbooks);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp.Application);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp);
            m_xlApp = null;
        }
        catch { }
        try
        {
            //清理垃圾进程
            this.killProcessThread();
        }
        catch { }
        GC.Collect();
    }
}
/// <summary>
/// 杀掉不死进程
/// </summary>
private void killProcessThread()
{
    ArrayList myProcess = new ArrayList();
    for (int i = 0; i < myProcess.Count; i++)
    {
        try
        {
            System.Diagnostics.Process.GetProcessById(int.Parse((string)myProcess[i])).Kill();
        }
        catch { }
    }
}

转自：http://blog.csdn.net/jadeflute/article/details/5853000