private ZipPackageRelationship CreateThemeOverridePart(ZipPackage p, ZipPackagePart partToCopy)
{
var id = GetIxFromChartUri(_chart.UriChart.OriginalString);
ThemeOverrideUri = GetNewUri(p, "/xl/theme/themeOverride{0}.xml", ref id);
var rel = _chart.Part.CreateRelationship(ThemeOverrideUri, TargetMode.Internal, ExcelPackage.schemaThemeOverrideRelationships);
ThemeOverridePart = p.CreatePart(ThemeOverrideUri, ExcelPackage.contentTypeThemeOverride);
ThemeOverrideXml = new XmlDocument();
ThemeOverrideXml.Load(partToCopy.GetStream());
foreach (var themeRel in partToCopy.GetRelationships())
{
var uri = OfficeOpenXml.Utils.UriHelper.ResolvePartUri(themeRel.SourceUri, themeRel.TargetUri);
var toPart = _chart.Part.Package.CreatePart(uri, PictureStore.GetContentType(uri.OriginalString));
var imageRel = ThemeOverridePart.CreateRelationship(uri, TargetMode.Internal, themeRel.RelationshipType);
SetRelIdInThemeDoc(ThemeOverrideXml, themeRel.Id, imageRel.Id);
var stream = partToCopy.GetStream();
var b = stream.GetBuffer();
toPart.GetStream().Write(b, 0, b.Length);
}
ThemeOverrideXml.Save(ThemeOverridePart.GetStream(FileMode.CreateNew));
partToCopy.Package.Dispose();
return(rel);
}