解决DevExpress GridView导出XLS文件报错：Unable to cast object of type 'Windows.Win32.Messageld' to type 'System.IConvertible'

public void ExportData(string format, string file)
{
    //使用IPrint接口导出文件，需要自动调整列宽度
    var xml = Path.Combine(Application.StartupPath, IdHelper.GetId() + ".xml");
    try
    {
        _view.SaveLayoutToXml(xml);
        _view.OptionsPrint.AutoWidth = false;//禁用自动宽度
        _view.BestFitColumns();//自适应列宽

        if (format.ToUpper() == "XLS" || format.ToUpper() == "XLSX")
            new DevExportTool().ExportToExcel(file, _view.GridControl);
        if (format == "DOCX")
            new DevExportTool().ExportToDocx(file, _view.GridControl);
        if (format == "PDF")
            new DevExportTool().ExportToPDF(file, _view.GridControl);
    }
    finally
    {
        if (File.Exists(xml))
        {
            _view.RestoreLayoutFromXml(xml);
            File.Delete(xml);
        }
    }
}