easy ui datagrid 导出 到execl

//-----------------------------------------------------
// @description 返回grid的(可见的)所有行给后端导出Excel用 @param {string} table    表格ID @returns rows @author 肖峰------------------------------------------------------
function getGridDataToExcelExport(table) {
    var allRows = $("#" + table).datagrid("getRows");
    return allRows;
}

 @description 返回grid的所有列 @author 肖峰
function getGridColumnFields(table) {
    var allCols = $("#" + table).datagrid("getColumnFields");
    return allCols;
}

 @description 返回grid的所有列的选项title、列宽等function getGridColumnFieldsOptions(table) {
    var allColsTitle = $("#" + table).datagrid("options").columns;
    return allColsTitle;
}



        导出结果集到Excel
        function exportGrid() {
            if (getGridDataToExcelExport("ResultGrid").length == 0) {
                alertMsg("系统提示","记录数为0，不需要导出！","error");
                return;
            }
            var entity = {};
            entity.GridRows = getGridDataToExcelExport("ResultGrid");
            entity.GridColumnoptions = getGridColumnFieldsOptions("ResultGrid");
            entity.ExportFileName = '产品箱盒对应查询结果.xls';
            POVOS.BarCode.Website.BoxCorrespondingQuery.ExportGridToExcelFileAndDownload(entity,function (p) {
                location.href = "ExportExcelFile.ashx?ExcelFileID=" + p.value;
            });
        }

var entity = {};
            entity.GridRows = getGridDataToExcelExport("ResultGrid");          
            entity.GridColumnoptions = getGridColumnFieldsOptions("ResultGrid");
            entity.ExportFileName = '产品物流流向查询结果.xls';           
            POVOS.BarCode.Website.ProductTransQuery.ExportGridToExcelFileAndDownload(entity,255)">function (p) {               
                location.href = "ExportExcelFile.ashx?ExcelFileID="+p.value;
            });
        }

/// <summary>
        /// 形成Excel对应的文件流存在数据库里，返回给前端File GUID
        </summary>
        <param name="entity"></param>
        <returns></returns>
        [AjaxMethod]
        public string ExportGridToExcelFileAndDownload(JavaScriptObject entity)
        {
            var gridRows = (JavaScriptArray)entity["GridRows"];
            var gridOptions = (JavaScriptArray)entity[GridColumnoptionsvar gridOptionList = (JavaScriptArray)gridOptions[0];
            可见的列
            List<JavaScriptObject> gridCols = new List<JavaScriptObject>();
            foreach (JavaScriptObject j in gridOptionList)
            {
                if (j.Value.IndexOf(hidden") == -1)
                {
                    gridCols.Add(j);
                }
            }
            var fileName = entity[ExportFileName"].ToString();           
            string tempFileName = AppDomain.CurrentDomain.BaseDirectory + CommonExcelFile.xls";
            FileStream fs = new FileStream(tempFileName,FileMode.Open,FileAccess.Read);
            var workBook = new hssfWorkbook(fs);
            workBook.SetSheetName(0,查询结果");
            var sheet = workBook.GetSheetAt(0); 
            表头(列)，第一行
            int newColIndex = 0;
            var titleRow = sheet.CreateRow(newColIndex);
            int cIndex = in gridCols)
            {
                titleRow.CreateCell(cIndex).SetCellValue(j[title"].ToString());
                int width = int.Parse(j[width"].ToString()) / 6;
                if (width > 255)
                    width = 250;
                sheet.SetColumnWidth(cIndex,width*256);
                cIndex++;
            }
            行记录
            for (int rowIndex = 0; rowIndex < gridRows.Count; rowIndex++)
            {
                newColIndex++;
                var row = sheet.CreateRow(newColIndex);
                var jsonEntity = gridRows[rowIndex] as JavaScriptObject;
                int colIndex = 0; colIndex < gridCols.Count; colIndex++)
                {
                    string cellValue = string.Empty;
                    JavaScriptObject colOption = (JavaScriptObject)gridCols[colIndex];
                    string field = colOption[field"].ToString();
                    if (jsonEntity[field] != null)
                        cellValue = jsonEntity[field].ToString();
                    row.CreateCell(colIndex).SetCellValue(cellValue);
                }
            }
            MemoryStream newFile = new MemoryStream();
            sheet.Workbook.Write(newFile);
            using (POVOSEntities db = new POVOSEntities())
            {
                var resultFile = new ExportFileEntity();
                resultFile.FileGuid = Guid.NewGuid();
                resultFile.FileName = fileName;
                resultFile.FileCreateDateTime = DateTime.Now;
                resultFile.FileStreamByte = newFile.GetBuffer();
                db.AddToExportFileEntity(resultFile);
                db.SaveChanges();
                return resultFile.FileGuid.ToString();
            }            
        }

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.SessionState; using NPOI.SS.usermodel; using NPOI.hssf.usermodel; using BarCode.DataAccess; namespace POVOS.BarCode.Website { <summary> 读取数据库Excel文件并下载 </summary> class ExportExcelFile : IHttpHandler,IRequiresSessionState { void ProcessRequest(HttpContext context) { new POVOSEntities()) { Guid fileID = new Guid(context.Request[ExcelFileID"] as string); var fileEntity = db.ExportFileEntity.Where(e => e.FileGuid == fileID).FirstOrDefault(); string filename = string.Format([{0}]{1}",DateTime.Now.ToString(yyMMddHHmmss"),fileEntity.FileName); context.Response.ContentType = application/vnd.ms-excel"; context.response.addheader(Content-dispositionottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; line-height:1.5; color:rgb(128,attachment;filename={0}",context.Server.UrlEncode(filename))); context.Response.Clear(); context.Response.BinaryWrite(fileEntity.FileStreamByte); context.Response.End(); } } bool IsReusable { get { return false; } } } }