How to Configure an AI Agent for FastReport .NET: Architecture, Limitations, and Report Migration

Working with reports often turns into a routine: editing XML templates (.frx), configuring data bindings, and adapting legacy formats. To automate this work, a specialized AI agent was created. This agent understands the FastReport .NET architecture and strictly follows enterprise development standards.

Business Value

Using a specialised AI agent with the FastReport .NET skill directly saves hours of routine work for developers and protects the product from vulnerabilities. The main advantages include faster development, fewer bugs (due to automatic data validation), and the complete elimination of data leak risks (passwords are never saved in templates).

Automatic Migration of Legacy Reports to Modern .NET Versions

A huge problem for many enterprise projects is the legacy of hundreds of reports written for the old .NET Framework (WinForms or WebForms). Manually porting such reports to modern platforms takes months. The Agent takes on this work:

• API Refactoring: The Agent automatically replaces obsolete FastReport method calls with their modern counterparts compatible with .NET 8 and .NET 9.
• Migration to Web Frameworks: Legacy WinForms reports are easily adapted for browser display. The Agent generates code to integrate the WebReport component into modern ASP.NET Core MVC and Blazor applications.
• Data Layer Update: Obsolete connections (e.g., direct SQL queries from the report via SqlDataSource) are converted into clean code where data is supplied through modern ORMs (Entity Framework Core) as strongly-typed collections (IEnumerable).

Compatible Neural Networks

The skill is fully bilingual and tested to work with top modern LLMs:

• Claude 3.5 Sonnet / Opus: Recommended model. Perfectly understands long system prompts, deeply analyzes complex XML template structures (.frx), and writes clean C# code.
• Gemini 1.5 Pro / Gemini 3.1 Pro: An excellent choice for mass migration due to its huge context window — you can upload dozens of templates and documentation at once.
• GPT-4o / GPT-4 Turbo: A classic and reliable option that navigates the .NET ecosystem perfectly.
• Adaptability: The Agent automatically responds and comments code in the language of your prompt.

Migration from Other Platforms: Crystal Reports and StimulSoft

In addition to migrating between .NET versions, the Agent significantly simplifies the transition from third-party reporting systems.

Import from Crystal Reports (.rpt)

Converting Crystal Reports files is often accompanied by the loss of complex logic and formulas. When importing .rpt files into the .frx format, the Agent performs the following tasks:

• Formula Adaptation: The syntax of Crystal Reports expressions differs from FastReport. The Agent automatically rewrites old formulas into correct C# expressions within the template.
• Data Binding Restoration: In Crystal Reports, data logic was often hardcoded deep inside the report. The Agent helps extract these queries into your C# application (Dapper/EF Core), binding the new data sources (IEnumerable) to the converted template.
• Layout Correction: After the basic automatic import, elements can shift. The Agent is capable of correcting the XML structure of the template to align tables and text fields.

Import from StimulSoft (.mrt)

StimulSoft reports have a similar architecture, but differ in their approach to building components (bands) and scripts.

• Script Migration: The Agent converts internal event scripts (OnBeforePrint, OnAfterData, etc.) from the StimulSoft format into safe and valid FastReport C# scripts.
• Structure Translation: Cross-tabs (Cross-Tab / Matrix) are structured differently in StimulSoft and FastReport. The Agent analyzes the logic of the .mrt file and rewrites it into a MatrixObject in FastReport, preserving the hierarchy of rows and columns.
• Garbage Cleanup: During automatic import, redundant styles or parameters are often generated. The Agent optimizes the XML code of the .frx file, removing unnecessary artifacts from the previous platform.

Architecture and Integration

The Agent promotes an enterprise approach to building reports. The database supplies data to the application (e.g., via EF Core). The application prepares DTOs or IEnumerable lists and passes this clean data to the FastReport Engine. The engine overlays the data onto the .frx template (design) and renders the result. The logic always remains in C#, and the visuals in the template.

Strict Limitations (Prohibitions)

To ensure the code remains clean and functional, the Agent adheres to strict rules:

1. No Guesswork: The Agent is prohibited from inventing API methods.
2. License Protection: The Agent does not replace Open Source with Commercial (and vice versa).
3. Careful Handling: It is prohibited to rewrite the entire .frx file for the sake of a minor fix.
4. Analysis: A mandatory Preflight Check (environment analysis) is required before work.

Security and Production

A report is a vulnerable point for data leaks and overloads.

• No Passwords: The Agent is strictly prohibited from saving Connection Strings inside .frx files.
• Script Security: The Agent never disables report script protection without a valid reason.
• Thread Safety: It is prohibited to use a single static Report instance for multiple threads.

Objective Disadvantages and Limitations

The Agent is not omnipotent. It is important to understand the following technical nuances:

• UI Blindness (Pixel-Perfect): The Agent does not see the final PDF. It can make perfect XML, but a human will have to adjust the paddings in the designer.
• No Drag & Drop: The Agent writes XML by hand. Creating very complex visual forms is easier with a classic mouse.
• Difficulty with huge files: Extra-large .frx templates (thousands of lines) can hit the limits of the neural network's context window.
• Prompt Dependency: You must clearly describe the structure of your C# classes to the Agent, otherwise it will not guess the property names for binding.

How to Get Started

You do not need to write instructions and prompts from scratch. Use ready-made skills from our repository:

Download prompts

Copy the downloaded configuration file (SKILL.md) to the global skills directory of your AI agent. After that, simply type in the chat, for example: "Connect FastReport to my ASP.NET project" or "Generate a matrix report based on this data". The Agent will automatically pick up the rules from the skill and execute the task.