作一个Excel exporter的组件
在博客园搜索了一下,导出Excel方法。
感觉没有什么价值的东西(收回这句,我又重新用关键字"excel xml导出"搜了一下,发现一些好东西分享)
无非是把datagrid存成excel,或者是建立一个模板,导出一个excel(只讲讲如何用.net来操作excel,网上到处都是)。
.net与excel的结合应用,我自己也写过三篇文章。
a universal class to complete import data from an excel file into a database (垃圾文章)
关于excel在asp.net中使用 (10分给7.5分;实际上是如何建立通用的可配置的,导入Excel数据的解决方案)
利用接口灵活实现Excel导入/到出数据功能 (垃圾文章)
这里言归正传,我下面说说如何建立一个灵活的、可配置的导出数据到Excel的解决方案。
告诉我,你是不是会经常碰到要导出这样的数据格式
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描述一下我们要干什么:
1.支持多表头定义。
2.固定的某格填入固定值
3.有一个数据区
4.某列某行可能要根据某些数据条件插入不同的背景,图片,备注。
甚至还有要求这样的格式
难道我们要每次用代码写,而不能只修改一下配置文件就完成么?
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这都是没有问题的,只要你明白我的思路和发挥一下自己的想像能力就可以作到扩展。
对,扩展,这就是我要强调的内容。
很多的文章的代码,无法帮你扩展,而只能让你去拷贝,这不是我们想要的。
来让我们加快速度来认识一下根据上面要求,扩展的xml文件
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abcd四个地方描述我们的excel会以那种方式,哪个sheet,哪些固定格,哪些列输出哪些内容。
对它建立了数据导出到Excel的对应关系。
cssClass是描述样式类
DBToExceLRelation 是描述总的数据对应关系类(它可能包含多个sheet对应关系)
FixedItem是固定格类
RelationItem是数据区对应类(它是一个可递归类)
SheetMapRelation这是一个excelsheet类(它包含FixedItem,RelationItem,cssClass)
如下图:
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接着来看看我们的导出接口
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using System;
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using System.Data;
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using excelExporter.Configs;
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using Excel;
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namespace excelExporter.Exporter
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{
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public delegate void OnDataBindHandler(Excel.Range excelRange,DataRow row,String ColumnName);
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/// <summary>
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/// IConvertor 的摘要说明。
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/// </summary>
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public interface IExporter
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{
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String Execute(System.Data.DataSet ds,DBToExceLRelation dbExcelRealtion,String filePath);
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event OnDataBindHandler OnDataBind;
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}
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}
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注意我们申明了一个事件,这样我们就可以处理特殊问题了。
如这些问题
某列某行可能要根据某些数据条件插入不同的背景,图片,备注。
下面是创建excel的一部分代码,这里完成了创建固定格,创建表头,创建数据区的。
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protected virtual void CreateExcel()
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{
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try
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{
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app = new Excel.ApplicationClass();
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}
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catch(System.Exception ex)
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{
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throw new Exception("无法实例化Excel对象;<br/>details:<hr size=1/>"+ex.Message);
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}
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app.DisplayAlerts = false;
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// //app.UserControl = true;
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wbs = app.Workbooks;
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int NowSheet =0;
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try
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{
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//wbc = wbs.Open(_filepath,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt);
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wbc = wbs.Add(_objOpt);
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for(int sheetIndex=0;sheetIndex<this._dbrelation.sheets.Length;sheetIndex++)
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{
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SheetMapRelation sheetmapR = _dbrelation.sheets[sheetIndex];
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NowSheet = sheetIndex+1;
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if(sheetmapR.SheetName!="")
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{
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wbc.Windows[NowSheet].Zoom = sheetmapR.WindowZomm;
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//wbc.Windows[NowSheet].
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ws= (Excel.Worksheet)wbc.Worksheets.get_Item(NowSheet);
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ws.Name = sheetmapR.SheetName;
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if(Convert.ToBoolean(ws.Cells.Select()))
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{
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Excel.Range allrange = (Excel.Range)wbc.Windows[NowSheet].Selection;
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allrange.Font.ColorIndex = _dbrelation.DataCss.FontColorIndex;
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allrange.Font.Name = _dbrelation.DataCss.FontName;
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allrange.Font.Size = _dbrelation.DataCss.FontSize;
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}
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firstRange = ws.get_Range(sheetmapR.DataStartRange.Trim().ToUpper(),this._objOpt);
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//取消全部选中
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firstRange.Select();
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///创建固定格
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CreateFixedRange(sheetmapR.FixedItems);
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///创建表头
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CreateTitle(sheetmapR.Items,sheetmapR.MaxDepth,firstRange,0);
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Excel.Range datastartrange = firstRange.get_Offset(sheetmapR.MaxDepth,_objOpt);
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if(_ds!=null&&_ds.Tables[sheetIndex]!=null)
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CreateDataRange(datastartrange,sheetmapR,_ds.Tables[sheetIndex]);///创建数据区
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}
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}
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_fileName = System.DateTime.Now.ToString("yy_MM_dd-hh_mm_ss_ff")+".xls";
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String tempName = _filepath+"/" +_fileName;
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wbc.SaveAs(tempName,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt,Excel.XlSaveAsAccessMode.xlExclusive,_objOpt,_objOpt,_objOpt,_objOpt,_objOpt);
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}
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catch(System.Exception ex)
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{
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throw new Exception("无法正确创建Excel文件;<br/>details:<hr size=1/>"+"创建第 "+NowSheet.ToString() +" sheet:"+ex.Message);
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}
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finally
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{
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this.Dispose();
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}
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}
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52
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53
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54
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55
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56
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57
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58
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59
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60
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61
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62
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63
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64
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65
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66
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67
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68
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69
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70
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71
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72
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73
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74
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75
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76
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77
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其中创建多表头是一个难点,我已经在blog上谈过几次,
这篇文章说了说基础:多表头的两个东西,宽度,深度。
http://www.cnblogs.com/king_astar/archive/2005/05/11/153071.html
最后调用如下,
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