（gridcontrol等)通用导出excel z

关于DevExpress Winform 的所有可打印控件的导出excel 的通用方法，并且解决DevExpress控件自带的方法存在的缺陷问题

1、解决GridControl自带方法不能导出图片；

2、GridControl 的BandGridView 多表头无法导出等问题；

3、解决PivotGridControl导出时候自动分组的问题；

4、支持多个控件一同导出同一个excel 等等

调用该方法真正做到控件的所见所得的导出功能。

/// <summary>
        /// DevExpress通用导出Excel,支持多个控件同时导出在同一个Sheet表
        /// eg:ExportToXlsx("",gridControl1,gridControl2);
        /// 将gridControl1和gridControl2的数据一同导出到同一张工作表
        /// </summary>
        /// <param name="title">文件名</param>
        /// <param name="panels">控件集</param>
        public void ExportToExcel(string title, params IPrintable[] panels)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.FileName = title;
            saveFileDialog.Title = "导出Excel";
            saveFileDialog.Filter = "Excel文件(*.xlsx)|*.xlsx|Excel文件(*.xls)|*.xls";
            DialogResult dialogResult = saveFileDialog.ShowDialog();
            if (dialogResult == DialogResult.Cancel)
                return;
            string FileName = saveFileDialog.FileName;
            PrintingSystem ps = new PrintingSystem();
            CompositeLink link = new CompositeLink(ps);
            ps.Links.Add(link);
            foreach (IPrintable panel in panels)
            {
                link.Links.Add(CreatePrintableLink(panel));
            }
            link.Landscape = true;//横向
            //判断是否有标题，有则设置
            //link.CreateDocument(); //建立文档
            try
            {
                int count = 1;
                //在重复名称后加（序号）
                while (File.Exists(FileName))
                {
                    if (FileName.Contains(")."))
                    {
                        int start = FileName.LastIndexOf("(");
                        int end = FileName.LastIndexOf(").") - FileName.LastIndexOf("(") + 2;
                        FileName = FileName.Replace(FileName.Substring(start, end), string.Format("({0}).", count));
                    }
                    else
                    {
                        FileName = FileName.Replace(".", string.Format("({0}).", count));
                    }
                    count++;
                }
                if (FileName.LastIndexOf(".xlsx") >= FileName.Length - 5)
                {
                    XlsxExportOptions options = new XlsxExportOptions();
                    link.ExportToXlsx(FileName, options);
                }
                else
                {
                    XlsExportOptions options = new XlsExportOptions();
                    link.ExportToXls(FileName, options);
                }
                if (DevExpress.XtraEditors.XtraMessageBox.Show("保存成功，是否打开文件？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
                    System.Diagnostics.Process.Start(FileName);//打开指定路径下的文件
            }
            catch (Exception ex)
            {
                DevExpress.XtraEditors.XtraMessageBox.Show(ex.Message);
            }
        }
        /// <summary>
        /// 创建打印Componet
        /// </summary>
        /// <param name="printable"></param>
        /// <returns></returns>
        PrintableComponentLink CreatePrintableLink(IPrintable printable)
        {
            ChartControl chart = printable as ChartControl;
            if (chart != null)
                chart.OptionsPrint.SizeMode = DevExpress.XtraCharts.Printing.PrintSizeMode.Stretch;
            PrintableComponentLink printableLink = new PrintableComponentLink() { Component = printable };
            return printableLink;
        }