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假設我正在編寫一個ASP.net Web應用程序。如何使用ASP.net輸出Excel電子表格
該應用程序的原始設計者使用「PopChart」使某些圖像顯示在Web應用程序中。其中一個頁面上有一個「導出到Excel」按鈕。點擊按鈕後，頁面內容將輸出到Excel中，如本教程所示：http://aspalliance.com/articleViewer.aspx?aId=1&pId=。
基本上，它將HTML輸出到XLS文件並由Excel解釋它。問題是，我需要擺脫PopChart。我用一個輸出PNG文件的網頁控件替換它（這可以在運行時保存在MemoryStream對象中）。 PopChart引用從公共服務器運行的Flash組件; 「PopChart」中的數據嵌入在HTML中。
但是，一旦我開始使用輸出PNG的網頁控件，所有的數據都在一個PNG文件中。我看不出有什麼辦法可以用HTML輸出PNG文件。我試圖將數據嵌入img src=...，但Excel不會解釋它。 Excel也不能從服務器下載PNG文件;服務器被鎖定，Excel無法訪問瀏覽器會話。
我該怎麼辦？
更新：我發現在MSDN論壇上給出了下面的代碼示例：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
using DocumentFormat.OpenXml.Validation;
using DocumentFormat.OpenXml.Drawing.Spreadsheet;
using System.IO;
using System.Drawing;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
string sFile = "ExcelOpenXmlWithImage.xlsx";
if (File.Exists(sFile))
{
File.Delete(sFile);
}
BuildWorkbook(sFile);
}
private static void BuildWorkbook(string filename)
{
try
{
using (SpreadsheetDocument xl = SpreadsheetDocument.Create(filename, SpreadsheetDocumentType.Workbook))
{
WorkbookPart wbp = xl.AddWorkbookPart();
WorksheetPart wsp = wbp.AddNewPart<WorksheetPart>();
Workbook wb = new Workbook();
FileVersion fv = new FileVersion();
fv.ApplicationName = "Microsoft Office Excel";
Worksheet ws = new Worksheet();
SheetData sd = new SheetData();
//string sImagePath = "polymathlogo.png";
string sImagePath = @"c:\temp\chartImg.png";
DrawingsPart dp = wsp.AddNewPart<DrawingsPart>();
ImagePart imgp = dp.AddImagePart(ImagePartType.Png, wsp.GetIdOfPart(dp));
using (FileStream fs = new FileStream(sImagePath, FileMode.Open))
{
imgp.FeedData(fs);
}
NonVisualDrawingProperties nvdp = new NonVisualDrawingProperties();
nvdp.Id = 1025;
nvdp.Name = "Picture 1";
nvdp.Description = "polymathlogo";
DocumentFormat.OpenXml.Drawing.PictureLocks picLocks = new DocumentFormat.OpenXml.Drawing.PictureLocks();
picLocks.NoChangeAspect = true;
picLocks.NoChangeArrowheads = true;
NonVisualPictureDrawingProperties nvpdp = new NonVisualPictureDrawingProperties();
nvpdp.PictureLocks = picLocks;
NonVisualPictureProperties nvpp = new NonVisualPictureProperties();
nvpp.NonVisualDrawingProperties = nvdp;
nvpp.NonVisualPictureDrawingProperties = nvpdp;
DocumentFormat.OpenXml.Drawing.Stretch stretch = new DocumentFormat.OpenXml.Drawing.Stretch();
stretch.FillRectangle = new DocumentFormat.OpenXml.Drawing.FillRectangle();
BlipFill blipFill = new BlipFill();
DocumentFormat.OpenXml.Drawing.Blip blip = new DocumentFormat.OpenXml.Drawing.Blip();
blip.Embed = dp.GetIdOfPart(imgp);
blip.CompressionState = DocumentFormat.OpenXml.Drawing.BlipCompressionValues.Print;
blipFill.Blip = blip;
blipFill.SourceRectangle = new DocumentFormat.OpenXml.Drawing.SourceRectangle();
blipFill.Append(stretch);
DocumentFormat.OpenXml.Drawing.Transform2D t2d = new DocumentFormat.OpenXml.Drawing.Transform2D();
DocumentFormat.OpenXml.Drawing.Offset offset = new DocumentFormat.OpenXml.Drawing.Offset();
offset.X = 1000;
offset.Y = 1000;
t2d.Offset = offset;
Bitmap bm = new Bitmap(sImagePath);
//http://en.wikipedia.org/wiki/English_Metric_Unit#DrawingML
//http://stackoverflow.com/questions/1341930/pixel-to-centimeter
//http://stackoverflow.com/questions/139655/how-to-convert-pixels-to-points-px-to-pt-in-net-c
DocumentFormat.OpenXml.Drawing.Extents extents = new DocumentFormat.OpenXml.Drawing.Extents();
extents.Cx = (long)bm.Width * (long)((float)914400/bm.HorizontalResolution);
extents.Cy = (long)bm.Height * (long)((float)914400/bm.VerticalResolution);
bm.Dispose();
t2d.Extents = extents;
ShapeProperties sp = new ShapeProperties();
sp.BlackWhiteMode = DocumentFormat.OpenXml.Drawing.BlackWhiteModeValues.Auto;
sp.Transform2D = t2d;
DocumentFormat.OpenXml.Drawing.PresetGeometry prstGeom = new DocumentFormat.OpenXml.Drawing.PresetGeometry();
prstGeom.Preset = DocumentFormat.OpenXml.Drawing.ShapeTypeValues.Rectangle;
prstGeom.AdjustValueList = new DocumentFormat.OpenXml.Drawing.AdjustValueList();
sp.Append(prstGeom);
sp.Append(new DocumentFormat.OpenXml.Drawing.NoFill());
DocumentFormat.OpenXml.Drawing.Spreadsheet.Picture picture = new DocumentFormat.OpenXml.Drawing.Spreadsheet.Picture();
picture.NonVisualPictureProperties = nvpp;
picture.BlipFill = blipFill;
picture.ShapeProperties = sp;
Position pos = new Position();
pos.X =(Int64) 1000;
pos.Y =(Int64) 1000;
Extent ext = new Extent();
ext.Cx = extents.Cx;
ext.Cy = extents.Cy;
AbsoluteAnchor anchor = new AbsoluteAnchor();
anchor.Position = pos;
anchor.Extent = ext;
anchor.Append(picture);
anchor.Append(new ClientData());
WorksheetDrawing wsd = new WorksheetDrawing();
wsd.Append(anchor);
Drawing drawing = new Drawing();
drawing.Id = dp.GetIdOfPart(imgp);
wsd.Save(dp);
ws.Append(sd);
ws.Append(drawing);
wsp.Worksheet = ws;
wsp.Worksheet.Save();
Sheets sheets = new Sheets();
Sheet sheet = new Sheet();
sheet.Name = "Sheet1";
sheet.SheetId = 1;
sheet.Id = wbp.GetIdOfPart(wsp);
sheets.Append(sheet);
wb.Append(fv);
wb.Append(sheets);
xl.WorkbookPart.Workbook = wb;
xl.WorkbookPart.Workbook.Save();
xl.Close();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
Console.ReadLine();
}
}
}
}
此代碼函數來創建內嵌有圖像的新的Excel電子表格。但是，我一直無法修改此代碼以將圖像放在我想要的電子表格上。 （是的，我嘗試更改偏移量的值。）我也沒有成功將任何文本或數字數據添加到行和列中。
這裏有人得到這個工作？
注意：我可以訪問DocumentFormat.OpenXml命名空間，但我不知道如何使用它，並且文檔很混亂。 – 2010-10-26 15:22:39