C#导出DataGridView到Excel

    public class ExcelHelper
    {
        private static object missing = Type.Missing;

        #region ================导出=================
        /// <summary>
        /// 导出到Excel
        /// </summary>
        /// <param name="dgv"></param>
        public static void ExportToExcel(System.Windows.Forms.DataGridView dgv)
        {
            ExportToExcel(dgv, 0, dgv.Columns.Count);
        }
        /// <summary>
        /// 导出到Excel
        /// </summary>
        /// <param name="dgv"></param>
        /// <param name="startColumnIndex">从第几列开始</param>
        public static void ExportToExcel(System.Windows.Forms.DataGridView dgv, int startColumnIndex)
        {
            ExportToExcel(dgv, startColumnIndex, dgv.Columns.Count);
        }
        /// <summary>
        /// 导出到Excel
        /// </summary>
        /// <param name="dgv"></param>
        /// <param name="startColumnIndex">从第几列开始</param>
        /// <param name="endColumnIndex">到第几列结束</param>
        public static void ExportToExcel(System.Windows.Forms.DataGridView dgv, int startColumnIndex, int endColumnIndex)
        {
            if (dgv.Rows.Count == 0)
                return;
            try
            {
                Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
                app.Visible = false;
                app.UserControl = false;
                Microsoft.Office.Interop.Excel.Workbook wb = app.Workbooks.Add(missing);
                Microsoft.Office.Interop.Excel.Worksheet ws = app.ActiveWorkbook.Sheets[1] as Microsoft.Office.Interop.Excel.Worksheet;
                try
                {
                    ExportToExcel(app, wb, ws, dgv, startColumnIndex, endColumnIndex);
                }
                finally
                {
                    app.Quit();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
                    GC.Collect();
                }
            }
            catch
            {
                System.Windows.Forms.MessageBox.Show("无法正常启动计算机上的EXCEL软件！", "系统提示", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Warning);
            }
        }

        /// <summary>
        /// 导出到excel
        /// </summary>
        /// <param name="app"></param>
        /// <param name="wb"></param>
        /// <param name="ws"></param>
        /// <param name="dgv"></param>
        /// <param name="startColumnIndex">从第几列开始</param>
        /// <param name="startColumnIndex">到第几列结束</param>
        private static void ExportToExcel(Microsoft.Office.Interop.Excel.Application app, Microsoft.Office.Interop.Excel._Workbook wb, Microsoft.Office.Interop.Excel.Worksheet ws, System.Windows.Forms.DataGridView dgv, int startColumnIndex, int endColumnIndex)
        {
            Microsoft.Office.Interop.Excel.Range range;
            int rowCount = dgv.Rows.Count;
            int colCount = 0;
            int colIndex = 0;
            int rowIndex = 0;
            #region 开始到结束

            int startIndex = 0;//开始的列索引
            int endIndex = dgv.Columns.Count;//结束的列索引
            if (endColumnIndex < endIndex)
                endIndex = endColumnIndex;
            if (startIndex < endIndex && startColumnIndex < endIndex)
            {
                startIndex = startColumnIndex;
            }
            #endregion
            for (int i = startIndex; i < endIndex; i++)
            {
                if (!dgv.Columns[i].Visible)
                    continue;
                colCount++;
            }
            //foreach (DataGridViewColumn col in dgv.Columns)
            //{
            //    if (!col.Visible)
            //        continue;
            //    colCount++;
            //}
            #region "Set title"
            String endCellAddress = "";
            if (colCount > 0 && colCount <= 26)
            {
                endCellAddress = ((char)('A' + colCount)).ToString() + "1";
            }
            else if (colCount > 26 && colCount < 26 * 26)
            {
                int iTemp = (int)Math.Ceiling((double)colCount / (double)26);
                endCellAddress = ((char)('A' + iTemp)).ToString() + ((char)('A' + (colCount - 26 * 26))).ToString() + "1";
            }
            else
            {
                throw new Exception("列数太多，操作出错！");
            }
            ws.Cells[1, 1] = "导出数据";
            range = ws.get_Range("A1", endCellAddress);
            range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
            range.Font.Size = 20;
            range.Font.Name = "黑体";
            range.Borders.LineStyle = 1;
            range.Select();
            range.Merge(false);
            //range.Merge(ws.get_Range("A1", endCellAddress));
            #endregion "Set title"

            #region " Set Header Values "
            object[,] colValues = new object[1, colCount + 1];
            colIndex = 0;
            colValues[0, colIndex] = "序号";
            for (int i = startIndex; i < endIndex; i++)
            {
                if (!dgv.Columns[i].Visible)
                    continue;
                colValues[0, colIndex + 1] = dgv.Columns[i].HeaderText;
                colIndex++;
            }
            //foreach (DataGridViewColumn col in dgv.Columns)
            //{
            //    if (!col.Visible)
            //        continue;
            //    colValues[0, colIndex + 1] = col.HeaderText;
            //    colIndex++;
            //}

            range = ws.get_Range(GetExcelCellName(1, 2), GetExcelCellName(colCount + 1, 2));
            range.Value2 = colValues;
            #endregion

            #region " Header Style "
            range.Font.Bold = true;
            range.Font.Name = "Georgia";
            range.Font.Size = 10;
            range.RowHeight = 26;
            range.EntireColumn.AutoFit();
            #endregion

            #region " Set Row Values "
            object[,] rowValues = new object[rowCount, colCount + 1];
            rowIndex = 0;
            foreach (System.Windows.Forms.DataGridViewRow row in dgv.Rows)
            {
                colIndex = 0;
                rowValues[rowIndex, colIndex] = rowIndex + 1;
                foreach (System.Windows.Forms.DataGridViewCell cell in row.Cells)
                {
                    if (cell.ColumnIndex == 0)
                    {
                        colIndex++;
                        continue;
                    }
                    if (row.Cells[colIndex].Value.ToString().IsInt())
                        rowValues[row.Index, colIndex] = string.Format("'{0}", row.Cells[colIndex].Value.ToString());
                    else
                        rowValues[row.Index, colIndex] = row.Cells[colIndex].Value.ToString();
                    colIndex++;
                }
                rowIndex++;
            }

            range = ws.get_Range(GetExcelCellName(1, 3), GetExcelCellName(colCount + 1, rowCount + 2));
            range.Value2 = rowValues;
            #endregion

            #region " Row Style "
            range.Font.Name = "Georgia";
            range.Font.Size = 9;
            range.RowHeight = 18;
            range.EntireColumn.AutoFit();
            range.Borders.ColorIndex = 2;
            #endregion

            #region " Set Borders "
            range = ws.get_Range(GetExcelCellName(1, 1), GetExcelCellName(colCount + 1, rowCount + 2));
            range.VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;
            range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
            range.Borders.Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
            range.Borders.Color = System.Drawing.Color.Black.ToArgb();
            #endregion
        }

        #region " GetCellName "

        private static string GetExcelCellName(int fColIndex, int fRowIndex)
        {
            if (fColIndex <= 0 || fColIndex > 256)
            {
                throw new Exception("Excel 列索引数值超出范围(1-256)!");
            }
            else if (fColIndex <= 26)
            {
                return GetExcelCellName(fColIndex) + fRowIndex.ToString();
            }
            else
            {
                string retLetter = GetExcelCellName(fColIndex / 26);
                retLetter += GetExcelCellName(fColIndex % 26);
                retLetter += fRowIndex.ToString();
                return retLetter;
            }
        }

        private static string GetExcelCellName(int fColIndex)
        {
            int i = 1;
            foreach (string letter in Enum.GetNames(typeof(ExcelColumnLetters)))
            {
                if (i == fColIndex)
                    return letter;
                i++;
            }
            throw new Exception("Excel 列索引数值超出范围(1-256)!");
        }

        #endregion

        public enum ExcelColumnLetters
        {
            A = 1,
            B = 2,
            C = 3,
            D = 4,
            E = 5,
            F = 6,
            G = 7,
            H = 8,
            I = 9,
            J = 10,
            K = 11,
            L = 12,
            M = 13,
            N = 14,
            O = 15,
            P = 16,
            Q = 17,
            R = 18,
            S = 19,
            T = 20,
            U = 21,
            V = 22,
            W = 23,
            X = 24,
            Y = 25,
            Z = 26
        }
        #endregion

    }