Introduction

Qt Bridge for C# connects a C# backend with a QML frontend. It is designed for .NET developers who want to keep application logic, models, and domain code in familiar C# while using Qt Quick for the user interface.

QML is Qt's declarative UI language: concise, binding-driven, and purpose-built for animated, fluid interfaces. Qt Quick is the rendering and UI framework behind it. The bridge lets those two worlds meet without requiring you to start from a full C++ Qt application.

Why use it?

Qt Quick is useful for building fluid, modern user interfaces, but the traditional Qt way can feel unfamiliar to a C# team. Qt Bridge for C# lowers that initial barrier by letting you:

• Keep business logic and application state in C#
• Describe the visual layer with QML and Qt Quick
• Expose C# types, models, and resources to the UI layer
• Evaluate Qt UI technology without committing to a full C++ application

Who is it for?

Use Qt Bridge for C# if your application logic belongs naturally in C#, but you want to explore Qt Quick as the UI layer. You do not need to know Qt or QML before you start; the early guides explain the Qt concepts through the lens of a .NET project.

The current release is especially relevant if you are:

• Looking for a cross-platform way to build desktop UIs for C# applications
• Evaluating Qt Bridge for C# as an early adopter
• Building desktop applications with .NET
• Exploring QML for the first time
• Using Visual Studio and want QML editor support in the same workflow
• Looking for examples that show how C# models connect to QML views

How it fits together

C# Application logic, models, resources

Qt Bridge for C# Exposes selected C# types to QML

QML Declarative interface layer

Qt Quick Renders the user interface

A Qt Bridge for C# application has two main sides:

• QML describes the user interface that Qt Quick renders.
• C# contains the application logic, data models, bridge attributes, and resources.

When you build your application, Qt Bridge for C# produces the bridge information and native support needed for the QML side to understand the C# types you expose. The Visual Studio extension can provide QML diagnostics, completion, semantic editor support, and project-aware imports.

What is included?

The repository and packages provide the main pieces needed to evaluate and build Qt Bridge for C# applications:

• NuGet packages for consuming the bridge from C# projects
• Bridge attributes and APIs for controlling what is exposed to QML
• Model helpers for list, table, and item-based data
• Resource helpers for packaging application assets
• .NET CLI templates and example applications
• A Visual Studio extension with project/item templates and QML Language Server integration
• Generated API reference pages for namespaces, types, properties, methods, and attributes

Current product status

Qt Bridge for C# is currently in beta. APIs, workflows, and documentation may evolve as feedback arrives. For beta expectations, licensing, terms, and dependency notes, see Release Status.

Where to go from here

• See Getting Started to choose a workflow and create your first project.