OfficeIMO.OpenDocument 2.0.0

OfficeIMO.OpenDocument

OfficeIMO.OpenDocument creates and edits ODT, ODS, and ODP files directly. Its only runtime dependency is the zero-dependency OfficeIMO.Drawing foundation used across OfficeIMO for lifecycle and result contracts. It has no third-party runtime dependencies and does not invoke LibreOffice, Microsoft Office, or UNO.

dotnet add package OfficeIMO.OpenDocument

Create documents

Create an ODT document:

using OfficeIMO.OpenDocument;

using OdtDocument document = OdtDocument.Create();
document.AddHeading("Summary", 1);
document.AddParagraph("Created with OfficeIMO.OpenDocument.");

OdtTable table = document.AddTable(2, 2, "Results");
table.Cell(0, 0).Text = "Metric";
table.Cell(0, 1).Text = "Value";
table.Cell(1, 0).Text = "Revenue";
table.Cell(1, 1).Text = "42";

document.Save("summary.odt");

Create a sparse ODS workbook:

using OdsDocument workbook = OdsDocument.Create();
OdsSheet sheet = workbook.AddSheet("Metrics");
sheet.Cell(0, 0).SetString("Name");
sheet.Cell(0, 1).SetString("Value");
sheet.Cell(1, 0).SetString("Revenue");
sheet.Cell(1, 1).SetDecimal(42.5m);

OdsCell total = sheet.Cell(2, 1);
total.Formula = "of:=SUM([.B2:.B2])";
OdsRecalculationReport calculation = workbook.Recalculate();
if (calculation.FailedCells > 0) {
    Console.WriteLine(calculation.Diagnostics[0].Message);
}

workbook.Save("metrics.ods");

Create an ODP presentation:

using OdpPresentation presentation = OdpPresentation.Create();
OdpSlide slide = presentation.AddSlide("Summary");
slide.AddTextBox(OdfRect.FromCentimeters(2, 1, 28, 3), "Native ODP");
slide.AddRectangle(OdfRect.FromCentimeters(2, 5, 8, 3)).FillColor = OdfColor.Parse("#D1E9FF");
slide.GetOrCreateSpeakerNotes().AddParagraph("Explain the result.");
presentation.Save("summary.odp");

Convert explicitly between OpenDocument and OfficeIMO Word, Excel, or PowerPoint models by installing the corresponding adapter package. Every conversion returns an OdfConversionReport that identifies mapped, approximated, skipped, and unsupported features.

dotnet add package OfficeIMO.Word.OpenDocument
dotnet add package OfficeIMO.Excel.OpenDocument
dotnet add package OfficeIMO.PowerPoint.OpenDocument

Edit without flattening the package

Typed objects remain backed by the source XML. A targeted edit rewrites its owning XML part while untouched package entries keep their original bytes.

using OdtDocument document = OdtDocument.Open("input.odt");
document.Paragraphs[0].Text = "Updated text";
OdfSaveResult result = document.Save("output.odt", new OdfSaveOptions {
    CompatibilityProfile = OdfCompatibilityProfile.PreserveSource
});

IReadOnlyList<string> rewritten = result.Report.RewrittenEntries;
IReadOnlyList<string> lossy = result.Report.LossyEntries;

New documents use ODF 1.4. Set OdfCompatibilityProfile.Odf13 when the output needs the ODF 1.3 schema and compatibility profile.

Supported editing surface

Unknown XML, vendor extensions, scripts, embedded content, and unsupported drawing features are preserved when their owning part is not replaced. The library never executes scripts, macros, event listeners, embedded objects, or external links. Formula evaluation is a bounded, side-effect-free parser for the documented local subset; it does not execute active content or fetch data.

OdfCapabilityCatalog.Advanced provides stable capability IDs and distinguishes editable subsets, preserved content, inspection, and detected-but-unsupported features.

Explicit boundaries

• Formula evaluation covers arithmetic, comparisons, concatenation, cell/range references, and common aggregate/math functions. External data, volatile functions, matrix formulas, and the complete OpenFormula language are not included.
• Tracked-change editing covers paragraph insertions and deletions. Arbitrary inline merges and conflict resolution remain preservation-oriented.
• Animation editing covers basic shape-attribute effects and fade-in timing. Advanced timing trees are preserved when untouched.
• Encrypted packages are detected and rejected before editing.
• Changed signed packages fail by default because saving would invalidate signatures. An explicit save option can remove invalidated signature entries.
• Signature creation and cryptographic validation, pivot-table editing, and complete chart editing are outside the current surface.
• Flat XML variants (.fodt, .fods, .fodp) can be opened and written, including embedded raster images. Exotic embedded objects and package-only features may not project losslessly.
• OdsSheet.Merge rejects merges above its default 100,000-cell materialization limit. Use the overload with an explicit lower limit when processing untrusted dimensions.
• Unknown package entries and extension XML are always preserved by package editing. Explicit format conversion and flat XML projection report content they cannot carry through OdfConversionReport and OdfSaveReport.LossyEntries.

The package targets netstandard2.0, net8.0, and net10.0, plus net472 on Windows. CI checks generated ODF 1.3 and 1.4 XML against pinned OASIS Relax NG schemas, then opens and resaves the generated packages with the runner's reported LibreOffice version.

Dependency footprint

• External: None; no OpenDocument SDK and no LibreOffice process.
• OfficeIMO: OfficeIMO.Drawing. ODT/ODS/ODP parsing, models, preservation, inspection, and writing are first-party.

See the complete OfficeIMO package map for related formats and conversion paths.