C# datatable 导出到Excel

/// <summary>
/// 将DataTable导出为Excel文件(.xls) 
/// </summary>
/// <param name="dt">要导出的DataTable</param>
public static void ErrorCrd_ExportToExcel(DataTable dt)
{
if (dt == null) return;

Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
Msg.Warning("无法创建Excel对象，可能您的电脑未安装Excel");
return;
}
System.Windows.Forms.SaveFileDialog saveDia = new SaveFileDialog();
saveDia.Filter = "Excel|*.xls";
saveDia.Title = "导出为Excel文件";
if (saveDia.ShowDialog() == System.Windows.Forms.DialogResult.OK
&& !string.Empty.Equals(saveDia.FileName))
{
Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
Microsoft.Office.Interop.Excel.Range range = null;
long totalCount = dt.Rows.Count;
long rowRead = 0;
float percent = 0;
string fileName = saveDia.FileName;
//写入标题
for (int i = 0; i < dt.Columns.Count; i++)
{
worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];
//range.Interior.ColorIndex = 15;//背景颜色
range.Font.Bold = true;//粗体
range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;//居中
//加边框
range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
//range.ColumnWidth = 4.63;//设置列宽
//range.EntireColumn.AutoFit();//自动调整列宽
//r1.EntireRow.AutoFit();//自动调整行高
}
//写入内容
for (int r = 0; r < dt.DefaultView.Count; r++)
{
for (int i = 0; i < dt.Columns.Count; i++)
{
worksheet.Cells[r + 2, i + 1] = dt.DefaultView[r][i];
range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[r + 2, i + 1];
range.Font.Size = 9;//字体大小
//加边框
range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
range.EntireColumn.AutoFit();//自动调整列宽
}
rowRead++;
percent = ((float)(100 * rowRead)) / totalCount;
System.Windows.Forms.Application.DoEvents();
}
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
if (dt.Columns.Count > 1)
{
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
}
try
{
workbook.Saved = true;
workbook.SaveCopyAs(fileName);
}
catch (Exception ex)
{
Msg.ShowError("导出文件时出错,文件可能正被打开！\n" + ex.Message);
return;
}

workbooks.Close();
if (xlApp != null)
{
xlApp.Workbooks.Close();
xlApp.Quit();
int generation = System.GC.GetGeneration(xlApp);
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
xlApp = null;
System.GC.Collect(generation);
}
GC.Collect();//强行销毁
#region 强行杀死最近打开的Excel进程
System.Diagnostics.Process[] excelProc = System.Diagnostics.Process.GetProcessesByName("EXCEL");
System.DateTime startTime = new DateTime();
int m, killId = 0;
for (m = 0; m < excelProc.Length; m++)
{
if (startTime < excelProc[m].StartTime)
{
startTime = excelProc[m].StartTime;
killId = m;
}
}
if (excelProc[killId].HasExited == false)
{
excelProc[killId].Kill();
}
#endregion
Msg.ShowInformation("导出成功!");
}
}

using System;
using System.Data;
using System.Data.OleDb;

namespace ZFSoft.Joint
{
    public class ExcelIO
    {
        private int _ReturnStatus;
        private string _ReturnMessage;

        /// <summary>
        /// 执行返回状态
        /// </summary>
        public int ReturnStatus
        {
            get
            {
                return _ReturnStatus;
            }
        }

        /// <summary>
        /// 执行返回信息
        /// </summary>
        public string ReturnMessage
        {
            get
            {
                return _ReturnMessage;
            }
        }

        public ExcelIO()
        {
        }

        
        /// <summary>
        /// 导入EXCEL到DataSet
        /// </summary>
        /// <param name="fileName">Excel全路径文件名</param>
        /// <returns>导入成功的DataSet</returns>
        public DataTable ImportExcel(string fileName)
        {
            //判断是否安装EXCEL
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                _ReturnStatus = -1;
                _ReturnMessage = "无法创建Excel对象，可能您的计算机未安装Excel";
                return null;
            }

            //判断文件是否被其他进程使用            
            Microsoft.Office.Interop.Excel.Workbook workbook;
            try
            {
                workbook = xlApp.Workbooks.Open(fileName, 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, 1, 0);
            }
            catch
            {
                _ReturnStatus = -1;
                _ReturnMessage = "Excel文件处于打开状态，请保存关闭";
                return null;
            }

            //获得所有Sheet名称
            int n = workbook.Worksheets.Count;
            string[] SheetSet = new string[n];
            System.Collections.ArrayList al = new System.Collections.ArrayList();
            for (int i = 1; i <= n; i++)
            {
                SheetSet[i - 1] = ((Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[i]).Name;
            }

            //释放Excel相关对象
            workbook.Close(null, null, null);
            xlApp.Quit();
            if (workbook != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
                workbook = null;
            }
            if (xlApp != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
                xlApp = null;
            }
            GC.Collect();

            //把EXCEL导入到DataSet
            DataSet ds = new DataSet();
            DataTable table = new DataTable();
            string connStr = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = " + fileName + ";Extended Properties=Excel 8.0";
            using (OleDbConnection conn = new OleDbConnection(connStr))
            {
                conn.Open();
                OleDbDataAdapter da;
                string sql = "select * from [" + SheetSet[0] + "$] ";
                da = new OleDbDataAdapter(sql, conn);
                da.Fill(ds, SheetSet[0]);
                da.Dispose();
                table = ds.Tables[0];
                conn.Close();
                conn.Dispose();
            }
            return table;
        }

        /// <summary>
        /// 把DataTable导出到EXCEL
        /// </summary>
        /// <param name="reportName">报表名称</param>
        /// <param name="dt">数据源表</param>
        /// <param name="saveFileName">Excel全路径文件名</param>
        /// <returns>导出是否成功</returns>
        public bool ExportExcel(string reportName, System.Data.DataTable dt, string saveFileName)
        {
            if (dt == null)
            {
                _ReturnStatus = -1;
                _ReturnMessage = "数据集为空！";
                return false;
            }

            bool fileSaved = false;
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                _ReturnStatus = -1;
                _ReturnMessage = "无法创建Excel对象，可能您的计算机未安装Excel";
                return false;
            }

            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
            worksheet.Cells.Font.Size = 10;
            Microsoft.Office.Interop.Excel.Range range;

            long totalCount = dt.Rows.Count;
            long rowRead = 0;
            float percent = 0;

            worksheet.Cells[1, 1] = reportName;
            ((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, 1]).Font.Size = 12;
            ((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, 1]).Font.Bold = true;

            //写入字段
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                worksheet.Cells[2, i + 1] = dt.Columns[i].ColumnName;
                range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[2, i + 1];
                range.Interior.ColorIndex = 15;
                range.Font.Bold = true;

            }
            //写入数值
            for (int r = 0; r < dt.Rows.Count; r++)
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    worksheet.Cells[r + 3, i + 1] = dt.Rows[r][i].ToString();
                }
                rowRead++;
                percent = ((float)(100 * rowRead)) / totalCount;
            }

            range = worksheet.get_Range(worksheet.Cells[2, 1], worksheet.Cells[dt.Rows.Count + 2, dt.Columns.Count]);
            range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
            if (dt.Rows.Count > 0)
            {
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
            }
            if (dt.Columns.Count > 1)
            {
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].ColorIndex = Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
            }

            //保存文件
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);
                    fileSaved = true;
                }
                catch (Exception ex)
                {
                    fileSaved = false;
                    _ReturnStatus = -1;
                    _ReturnMessage = "导出文件时出错,文件可能正被打开！\n" + ex.Message;
                }
            }
            else
            {
                fileSaved = false;
            }

            //释放Excel对应的对象
            if (range != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
                range = null;
            }
            if (worksheet != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
                worksheet = null;
            }
            if (workbook != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
                workbook = null;
            }
            if (workbooks != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks);
                workbooks = null;
            }
            xlApp.Application.Workbooks.Close();
            xlApp.Quit();
            if (xlApp != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
                xlApp = null;
            }
            GC.Collect();
            return fileSaved;
        }
    }
}