Build Interactive Diagrams with FlexDiagram for .NET

Automatically generate diagrams directly from hierarchical data using the ChildItemsPath property. Simply bind FlexDiagram to a collection of business objects, where each item contains its own child collection, and the control will recursively traverse the hierarchy to build the complete visual structure automatically. This approach makes it easy to create organizational charts, file system explorers, dependency trees, nested workflows, and other parent-child visualizations without manually defining nodes or connections. FlexDiagram handles the hierarchy generation for you while still allowing full control over node templates, layouts, styling, and connector behavior.

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FlexDiagram can automatically create hierarchical diagrams from flat, tabular data sources such as databases, DataTables, CSV files, and spreadsheets. In flat data binding mode, each column represents a level in the hierarchy, allowing FlexDiagram to interpret parent-child relationships directly from structured rows of data without requiring nested object models.

Adjacent rows containing the same value within a column are intelligently grouped into a single node, making it easy to generate clean organizational charts, process hierarchies, category trees, and other structured visualizations from relational data sources.

This flexible binding model makes it simple to transform existing business data into rich visual diagrams in your WinForms, WPF, WinUI, or .NET MAUI applications with minimal code and configuration.

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Create diagrams entirely in code without requiring a predefined data source. With unbound support, you can manually add each node and edge, define their properties, customize their appearance, and control exactly how elements connect within the diagram.

This approach is ideal for custom workflows, decision trees, network maps, process designers, and any scenario where your diagram structure is generated dynamically or does not fit a standard flat or hierarchical data model.

Unbound mode also gives you the flexibility to parse virtually any custom data source, such as proprietary files, API responses, configuration data, legacy formats, or in-memory objects, and translate it into a fully visual diagram using C# or VB.NET.

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FlexDiagram supports Mermaid syntax, allowing you to define and render diagrams using a simple, text-based diagramming language. Quickly create flowcharts, organizational charts, process diagrams, and other visual structures from lightweight markup without manually positioning nodes and connectors.

You can easily import existing Mermaid content or generate diagrams dynamically at runtime from strings, files, database content, or user input. Even new users to Mermaid can rapidly prototype complex diagrams using its intuitive syntax while leveraging FlexDiagram to render them natively in WinForms, WPF, WinUI, and .NET MAUI applications.

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FlexDiagram can render diagrams using fixed dimensions or automatically scale content to fit the available space, making it easy to build responsive diagram experiences for any screen size or window layout. Create large, data-rich diagrams that dynamically resize to remain fully visible and readable across desktop and mobile applications. Built-in zooming and scaling capabilities also allow end users to smoothly adjust the view at runtime without requiring additional code or custom rendering logic.

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Control the flow of your diagrams with a single property by choosing between left-to-right, right-to-left, top-to-bottom, or bottom-to-top layouts. FlexDiagram automatically arranges nodes and connectors to match the selected orientation, making it easy to adapt visualizations for different data structures, UI layouts, and reading directions. Layout direction can also be changed dynamically at runtime, allowing users to instantly switch perspectives and choose the most effective view for their data.

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FlexDiagram includes a wide variety of built-in node shapes, including rectangles, rounded rectangles, circles, ellipses, diamonds, rhombuses, pentagons, hexagons, octagons, and more, making it easy to create professional flowcharts, decision trees, organizational charts, and process diagrams.

Each node can be extensively customized with borders, fill styles, titles, content regions, fonts, and embedded images to create rich, information-dense visualizations that match your application’s design language.

For advanced scenarios, FlexDiagram also supports fully custom node geometries by allowing you to define each node's 2D polygon. This gives you complete freedom to create specialized diagram symbols, branded shapes, technical icons, or domain-specific visual elements tailored to your application.

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FlexDiagram provides a wide range of connector and arrow styles to help you create clean, readable, and visually polished diagrams. Choose from straight lines, rounded spline connectors, rectilinear elbow routing, or advanced Sugiyama-style S-curved connections to best represent workflows, hierarchies, dependencies, and process relationships.

Connectors can be fully customized with adjustable thickness, colors, transparency, dash patterns, and arrowhead styles, giving you complete control over the visual appearance of diagram relationships. Whether you need subtle dotted dependency lines, bold directional flows, or highly structured routing for complex diagrams, FlexDiagram makes it easy to tailor every connection to match your application’s design and data visualization needs.

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FlexDiagram is part of the larger FlexChart family, and so it shares the same collection of color palettes. You can apply one of the 16 built-in color palettes to quickly give your diagrams a colorful style, or you can provide your own custom palette. FlexDiagram also supports dark styles in .NET 10.

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FlexDiagram for WinForms includes a distinctive Sketch rendering mode that gives diagrams a hand-drawn appearance, perfect for whiteboard-style visualizations, brainstorming tools, prototypes, and informal workflow presentations.

The unique sketch render mode quickly turns your polished diagrams into hand-drawn works of art, or just enable it as a fun runtime feature for your users to try. It can be enabled by just setting the SketchMode property, and it’s only supported in WinForms.

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FlexDiagram supports customizable node templates using standard XAML DataTemplate techniques, allowing you to design rich, reusable diagram nodes with complete control over layout and presentation. Define node visuals declaratively in XAML using familiar WPF, WinUI, or .NET MAUI patterns, then bind template elements directly to your underlying data objects.

Custom templates can include text, images, icons, status indicators, buttons, shapes, and complex layouts, making it easy to create polished, data-rich visualizations tailored to your application. Because templates are reusable, you can maintain a consistent look and feel across large diagrams while simplifying development and maintenance.

FlexDiagram includes built-in zooming and scaling capabilities that make large or detailed diagrams easy to navigate on any screen size or device. Users can quickly zoom in for precision viewing or zoom out to see the complete structure, with convenient scale-to-fit functionality that automatically resizes the entire diagram to fit within the available viewport.

Interactive navigation is fully integrated, allowing users to zoom using the mouse wheel, touchpad gestures, or programmatic controls without requiring additional code. When working with zoomed-in diagrams, users can smoothly pan and scroll by dragging the mouse to explore different regions of the visualization. These features make FlexDiagram ideal for complex organizational charts, workflow systems, engineering diagrams, and other large-scale visualizations that require intuitive navigation and responsive viewing experiences.

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Manage large-scale diagrams with support for collapsible nodes and hierarchical drill-down views. FlexDiagram allows users to expand or collapse diagram sections to focus on the most relevant information while reducing visual clutter. Configure the layout to either preserve the original spacing of hidden nodes for consistent positioning or automatically reflow and scale the diagram to make optimal use of available space.

This makes FlexDiagram ideal for organizational charts, dependency graphs, workflow systems, and other data-rich visualizations that need to remain clear and navigable at any size.

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Simplify your diagram displays by providing additional information to users via tooltips on nodes and edges. Each node and edge object supports a tooltip property that you can customize.

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FlexDiagram includes built-in interactions such as zooming, selection, tooltips, and collapsible nodes to cover most diagram navigation and usability scenarios out of the box. For advanced or highly customized interactions, the powerful HitTest method gives you precise control over how users interact with the diagram surface.

When combined with mouse movement, click, or touch events, HitTest can identify exactly which node, connector, or diagram element the user is interacting with. This makes it easy to implement custom behaviors such as hover effects, contextual menus, drag-and-drop interactions, node highlighting, custom tooltips, interactive editing experiences, and application-specific workflows tailored to your users’ needs.

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FlexDiagram’s selection features make it easy to build interactive drill-down experiences where your application can respond dynamically to user input. Enable node selection to allow users to focus on specific diagram elements, trigger related actions, display contextual data, or navigate deeper into connected workflows and hierarchies.

Customize the visual appearance of selected nodes with your own selection styles, highlighting, or emphasis effects to match your application’s design. You can also retrieve the selected node index or associated data object to seamlessly integrate diagram interactions with business logic and application state.

For advanced selection scenarios, including edge selection, custom hit regions, or specialized interaction behavior, FlexDiagram also provides the powerful HitTest API for precise control over user interaction handling.

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