.NET数据导出到Excle表格

Posted 2022-12-02 沧海·

简述一下整个思路，具体见下文代码，我已经贴上比较详细的代码注释：
注意这里的思路并不是将表格下到客户端，而是下载到服务端，返回给前端服务端存放文件的地址，让前端去访问这个表格，就可以自行保存到本地了。

     public JsonResult  OutExcel()
        
            try
             
            	//这是获取前端传过来的查询条件
                var Startime = Request.QueryString["Startime"];
                var Endtime = Request.QueryString["Endtime"];
				//设置好文件名：GUID唯一标识防止重复
                string name = string.Format("01", Guid.NewGuid(), "导出"); ;
                
                DateTime STime = DateTime.Now;
                DateTime ETime = DateTime.Now;
                //获取当前相对路径如果没有该文件夹，自动创建，用来保存下载好的表格
                string ipath = Server.MapPath("DownLoad") + "\\\\";
                string ipath1 = Server.MapPath("DownLoad");
                if (!Directory.Exists(ipath1))
                
                    Directory.CreateDirectory(ipath1);
                
                MemberBLL bll = new MemberBLL(); 

                #region 判断条件
            

                if (!string.IsNullOrEmpty(Startime.ToString()))
                

                    STime = Convert.ToDateTime(Startime);
                
                if (!string.IsNullOrEmpty(Endtime.ToString()))
                

                    ETime = Convert.ToDateTime(Endtime);
                
                #endregion

                DataSet ds = null;
                try
                
               		//执行查询获取到要导出的数据
                    ds = bll.GetList(STime,ETime);
                
                catch (Exception ex)
                
                    LogHelper.Info("查询语句" + ex.Message);
                
                 
                decimal record = 0;
                if (ds==null)
                

                    return Json(new  b = 1, p = "没有需要导出的数据" );
                
                else
                
                     //接下来我做了一下数据二次处理
                   
                    ds.Tables[0].Columns.Remove("DIVISIONNAME");//可移除DIVISIONNAME这一列
                    foreach (DataColumn dc in ds.Tables[0].Columns)
                     
						//这里我将列名修改为我将要展示的，避免展示数据库字段
                        if (dc.ColumnName == "CHINESE_NAME")
                        
                            dc.ColumnName = "中文名";//可以将列名改变
                        
                        if (dc.ColumnName== "ENGLISH_NAME")
                        
                            dc.ColumnName = "英文名";
                         
                        if(dc.ColumnName == "COMMENTS")
                        
                            dc.ColumnName = "备注";
                         
                        if (dc.ColumnName == "REGISTERED_DATE")
                        
                            dc.ColumnName = "注册时间";
                        
                        if (dc.ColumnName == "CREATE_BY")
                        
                            dc.ColumnName = "创建人";
                        
                    

                
                DataTable dt = ds.Tables[0];

                //dt.Columns.Remove("RECORD_ID");
                DataToExcel ec = new DataToExcel();
                string path = string.Empty;

                try
                
                	//最后我会贴出将DT换为表格的方法
                    path = ec.DataExcelPath(dt, name, ipath); 
                
                catch (Exception ex)
                
                    LogHelper.Info(ex.Message + "生成excle");
                
                string fileName = name;//客户端保存的文件名

                string userid = LoginUser.UserID;

                 
				//你的服务器地址
                string iPSover =  IP ;
                string filePath = "http://" + iPSover + "/Member" + "/DownLoad/" + path;//路径
                if (string.IsNullOrEmpty(path))
                
                    return Json("");


                
                var result = "true";
                if (!string.IsNullOrEmpty(result))
                
                    if (result == "表中无数据")
                    
                        return Json(new  b = 1, p = "表中无数据" );
                    
                    else
                    
                        return Json(new  b = 0, p = filePath );
                    
                
                return Json(new  b = 1, p = "服务器异常，请稍后再试" );
            
            catch (Exception ex)
            
                LogHelper.Info(ex.Message);
                return Json(new  b = 1, p = "服务器异常，请稍后再试" );
            
        

这是将DataTable的数据导出显示为报表(不使用Excel对象)的方法：

 public string DataExcelPath(System.Data.DataTable dt, string strTitle, string FilePath)
        
            COM.Excel.cExcelFile excel = new COM.Excel.cExcelFile();
            ClearFile(FilePath);
            string filename = strTitle + ".xls";
            excel.CreateFile(FilePath + filename);
            excel.PrintGridLines = false;
            COM.Excel.cExcelFile.MarginTypes mt1 = COM.Excel.cExcelFile.MarginTypes.xlsTopMargin;
            COM.Excel.cExcelFile.MarginTypes mt2 = COM.Excel.cExcelFile.MarginTypes.xlsLeftMargin;
            COM.Excel.cExcelFile.MarginTypes mt3 = COM.Excel.cExcelFile.MarginTypes.xlsRightMargin;
            COM.Excel.cExcelFile.MarginTypes mt4 = COM.Excel.cExcelFile.MarginTypes.xlsBottomMargin;
            double height = 1.5;
            excel.SetMargin(ref mt1, ref height);
            excel.SetMargin(ref mt2, ref height);
            excel.SetMargin(ref mt3, ref height);
            excel.SetMargin(ref mt4, ref height);
            COM.Excel.cExcelFile.FontFormatting ff = COM.Excel.cExcelFile.FontFormatting.xlsBold;
            COM.Excel.cExcelFile.FontFormatting contentFont = COM.Excel.cExcelFile.FontFormatting.xlsNoFormat;
            string font = "宋体";
            short fontsize = 9;
            excel.SetFont(ref font, ref fontsize, ref ff);
            byte b1 = 1,
                b2 = 12;
            short s3 = 12;
            excel.SetColumnWidth(ref b1, ref b2, ref s3);
            string header = "页眉";
            string footer = "页脚";
            excel.SetHeader(ref header);
            excel.SetFooter(ref footer);

            COM.Excel.cExcelFile.ValueTypes vt = COM.Excel.cExcelFile.ValueTypes.xlsText;
            COM.Excel.cExcelFile.CellFont cf = COM.Excel.cExcelFile.CellFont.xlsFont0;
            COM.Excel.cExcelFile.CellAlignment ca = COM.Excel.cExcelFile.CellAlignment.xlsCentreAlign;
            COM.Excel.cExcelFile.CellHiddenLocked chl = COM.Excel.cExcelFile.CellHiddenLocked.xlsNormal;
            // 报表标题
            int cellformat = 1; 
            int rowIndex = 1;//起始行
            int colIndex = 0;

            //取得列标题				
            foreach (DataColumn colhead in dt.Columns)
            
                colIndex++;
                object name = colhead.ColumnName.Trim();
                
                excel.WriteValue(ref vt, ref cf, ref ca, ref chl, ref rowIndex, ref colIndex, ref name, ref cellformat);
            
            //取得表格中的数据	
            excel.SetFont(ref font, ref fontsize, ref contentFont);     //正文字体调成普通样式
            foreach (DataRow row in dt.Rows)
            
                rowIndex++;
                colIndex = 0;
                foreach (DataColumn col in dt.Columns)
                
                    colIndex++;
                    if (col.DataType == System.Type.GetType("System.DateTime"))
                    
                        object str = (object)(Convert.ToDateTime(row[col.ColumnName].ToString())).ToString("yyyy-MM-dd"); ;
                        excel.WriteValue(ref vt, ref cf, ref ca, ref chl, ref rowIndex, ref colIndex, ref str, ref cellformat);
                    
                    else
                    
                        object str = (object)row[col.ColumnName].ToString();
                        excel.WriteValue(ref vt, ref cf, ref ca, ref chl, ref rowIndex, ref colIndex, ref str, ref cellformat);
                    
                
            
            int ret = excel.CloseFile();
            //			if(ret!=0)
            //			
            //				//MessageBox.Show(this,"Error!");
            //			
            //			else
            //			
            //				//MessageBox.Show(this,"请打开文件c:\\\\test.xls!");
            //			
            return filename;