DataGridView按列顺序导出Excel

先添加引用程序集 Microsoft.Office.Interop.Excel

声明 using Excel = Microsoft.Office.Interop.Excel;  

以及贴出方法：

//DataGridView数据导出Excel
        private void ExportExcel(string fileName, DataGridView myDGV)
        {
            string saveFileName = "";
            //bool fileSaved = false;
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xls";
            saveDialog.Filter = "Excel文件|*.xls";
            saveDialog.FileName = fileName;
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0) 
                return; //被点了取消 
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
                return;
            }


            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


            string[] array = new string[myDGV.Columns.Count];


            //获取Visble =true 的列 
            foreach (DataGridViewColumn column in myDGV.Columns)
            {
                if (column.Visible == true)
                {
                    array[column.DisplayIndex] = column.HeaderText + '|' + column.Name; ;
                }
            }


            int RowsCount = myDGV.Rows.Count;
            int ColumnsCount = array.Length;
            int mm = 1;
            for (int i = 0; i < ColumnsCount; i++)
            {
                string[] str =new string[2];
                string ColumnName;
                try
                {
                    str = array.GetValue(i).ToString().Split('|');
                    ColumnName = str[0];
                }
                catch
                {
                    continue;
                }
                //导出列名 
                worksheet.Cells[1, mm] = ColumnName;
                //导出列内容 
                for (int m = 0; m < RowsCount; m++)
                {
                    try
                    {
                        worksheet.Cells[m + 2, mm] = myDGV.Rows[m].Cells[str[1]].FormattedValue.ToString();
                    }
                    catch
                    { }
                }
                //执行完一列 mm++ 
                mm++;
            }
            worksheet.Columns.EntireColumn.AutoFit();


            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);
                }
                catch (Exception ex)
                {


                    MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                }
            }


            xlApp.Quit();
            GC.Collect();//强行销毁 
            MessageBox.Show(fileName + "的表格资料保存成功", "提示", MessageBoxButtons.OK);
        }