Edit and validate existing Visio diagrams

Loaded diagrams use the same page, shape, connector, data, and fluent APIs as newly created files. You can select shapes by ID, text, layer, master, or Shape Data and then apply a consistent update.

Update matching shapes

using OfficeIMO.Drawing;
using OfficeIMO.Visio;
using OfficeIMO.Visio.Fluent;
using Color = OfficeIMO.Drawing.OfficeColor;

VisioDocument.Load("operations.vsdx")
    .AsFluent()
    .ExistingPage("Operations", page => page
        .ShapesWithData("Owner", "Ops", selection => selection
            .Fill(Color.LightBlue)
            .ShapeData(
                "Reviewed",
                "Yes",
                "Reviewed",
                VisioShapeDataType.Boolean))
        .ShapesContainingText("Legacy", selection => selection
            .Text(shape => shape.Text!.Replace(
                "Legacy",
                "Production",
                StringComparison.Ordinal))))
    .End()
    .Save("operations.updated.vsdx");

Work with layers and Shape Data

var document = VisioDocument.Create("architecture.vsdx");
var page = document.AddPage("Architecture");

page.AddLayer("Infrastructure");
page.AddLayer("Annotations").Print = false;

var server = page.AddProcess(2, 5, 2, 1, "API server");
server.SetShapeData(
    "Owner",
    "Platform",
    "Owner",
    VisioShapeDataType.String,
    "Owning support team");

page.AddToLayer("Infrastructure", server);
document.Save();

Validate in memory or from disk

IReadOnlyList<string> inMemoryIssues = document.Validate();
IReadOnlyList<string> savedIssues =
    VisioValidator.Validate("architecture.vsdx");

Validation checks package and diagram invariants understood by OfficeIMO. A successful validation does not claim that every optional feature in every Visio viewer is identical. When desktop Microsoft Visio is available, the example and test tooling can add an application-level open/save check without making it a runtime requirement.

Use image export to add a human-reviewable preview to automated validation.