以下是两种方法，一种使用MemoryStream，另一种使用磁盘上的真实文件。
public void InsertImage(long x, long y, long? width, long? height, string sImagePath, WorksheetPart wsp)
{
try
{
DrawingsPart dp;
ImagePart imgp;
WorksheetDrawing wsd;
ImagePartType ipt;
switch (sImagePath.Substring(sImagePath.LastIndexOf('.') + 1).ToLower())
{
case "png":
ipt = ImagePartType.Png;
break;
case "jpg":
case "jpeg":
ipt = ImagePartType.Jpeg;
break;
case "gif":
ipt = ImagePartType.Gif;
break;
default:
return;
}
if (wsp.DrawingsPart == null)
{
//----- no drawing part exists, add a new one
dp = wsp.AddNewPart<DrawingsPart>();
imgp = dp.AddImagePart(ipt, wsp.GetIdOfPart(dp));
wsd = new WorksheetDrawing();
}
else
{
//----- use existing drawing part
dp = wsp.DrawingsPart;
imgp = dp.AddImagePart(ipt);
dp.CreateRelationshipToPart(imgp);
wsd = dp.WorksheetDrawing;
}
using (FileStream fs = new FileStream(sImagePath, FileMode.Open))
{
imgp.FeedData(fs);
}
int imageNumber = dp.ImageParts.Count<ImagePart>();
if (imageNumber == 1)
{
Drawing drawing = new Drawing();
drawing.Id = dp.GetIdOfPart(imgp);
wsp.Worksheet.Append(drawing);
}
NonVisualDrawingProperties nvdp = new NonVisualDrawingProperties();
nvdp.Id = new UInt32Value((uint)(1024 + imageNumber));
nvdp.Name = "Picture " + imageNumber.ToString();
nvdp.Description = "";
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 = 0;
offset.Y = 0;
t2d.Offset = offset;
Bitmap bm = new Bitmap(sImagePath);
DocumentFormat.OpenXml.Drawing.Extents extents = new DocumentFormat.OpenXml.Drawing.Extents();
if (width == null)
extents.Cx = (long)bm.Width * (long)((float)914400 / bm.HorizontalResolution);
else
extents.Cx = width * (long)((float)914400 / bm.HorizontalResolution);
if (height == null)
extents.Cy = (long)bm.Height * (long)((float)914400 / bm.VerticalResolution);
else
extents.Cy = 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 = x * 914400 / 72;
pos.Y = y * 914400 / 72;
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());
wsd.Append(anchor);
wsd.Save(dp);
}
catch (Exception ex)
{
throw ex; // or do something more interesting if you want
}
}
//use memorystream
public void InsertImage(long x, long y, long? width, long? height, MemoryStream ms, WorksheetPart wsp)
{
try
{
DrawingsPart dp;
ImagePart imgp;
WorksheetDrawing wsd;
ImagePartType ipt = ImagePartType.Jpeg;
if (wsp.DrawingsPart == null)
{
//----- no drawing part exists, add a new one
dp = wsp.AddNewPart<DrawingsPart>();
imgp = dp.AddImagePart(ipt, wsp.GetIdOfPart(dp));
wsd = new WorksheetDrawing();
}
else
{
//----- use existing drawing part
dp = wsp.DrawingsPart;
imgp = dp.AddImagePart(ipt);
dp.CreateRelationshipToPart(imgp);
wsd = dp.WorksheetDrawing;
}
Bitmap bitmap = new Bitmap(ms);
imgp.FeedData(ms);
int imageNumber = dp.ImageParts.Count<ImagePart>();
if (imageNumber == 1)
{
Drawing drawing = new Drawing();
drawing.Id = dp.GetIdOfPart(imgp);
wsp.Worksheet.Append(drawing);
}
NonVisualDrawingProperties nvdp = new NonVisualDrawingProperties();
nvdp.Id = new UInt32Value((uint)(1024 + imageNumber));
nvdp.Name = "Picture " + imageNumber.ToString();
nvdp.Description = "";
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 = 0;
offset.Y = 0;
t2d.Offset = offset;
DocumentFormat.OpenXml.Drawing.Extents extents = new DocumentFormat.OpenXml.Drawing.Extents();
//Bitmap bitmap = new Bitmap(ms);
if (width == null)
extents.Cx = (long)bitmap.Width * (long)((float)914400 / bitmap.HorizontalResolution);
else
extents.Cx = width * (long)((float)914400 / bitmap.HorizontalResolution);
if (height == null)
extents.Cy = (long)bitmap.Height * (long)((float)914400 / bitmap.VerticalResolution);
else
extents.Cy = height * (long)((float)914400 / bitmap.VerticalResolution);
bitmap.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 = x * 914400 / 72;
pos.Y = y * 914400 / 72;
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());
wsd.Append(anchor);
wsd.Save(dp);
}
catch (Exception ex)
{
throw ex; // or do something more interesting if you want
}
}
如果我调用第一种方法（在磁盘上使用真实文件），没关系，我可以将我的图片插入excel文件。但是如果我将文件读入memorystream并调用method2，我可以看到带有错误信息的图片矩形。
所以我的问题是如何通过memorystream将图片插入excel？因为我不会在磁盘上创建太多文件。
答案 0 :(得分：0)
我相信您需要先从流中创建位图图像数据
Stack Overflow上有一个解决方案：字节数组到位图图像 我从解决方案中复制粘贴代码：
int w= 100;
int h = 200;
int ch = 3; //number of channels (ie. assuming 24 bit RGB in this case)
byte[] imageData = new byte[w*h*ch]; //you image data here
Bitmap bitmap = new Bitmap(w,h,PixelFormat.Format24bppRgb);
BitmapData bmData = bitmap.LockBits(new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat);
IntPtr pNative = bmData.Scan0;
Marshal.Copy(imageData,0,pNative,w*h*ch);
bitmap.UnlockBits(bmData);
答案 1 :(得分：0)
好的，我想我找到了解决方案。
我将memorystream参数更改为字符串，并将其转换为内存流，如下所示：
MemoryStream ms = new System.IO.MemoryStream(System.Convert.FromBase64String(str))
现在，它有效。
我是从开放的xml sdk 2.5生产力工具中学习的。