Blazor is a powerful framework, but most problems in real-world applications are not framework issues — they are coding standard issues.
After working on multiple production Blazor applications, here are 10 common mistakes that quietly hurt performance, maintainability, and scalability — and how to avoid them.
1. Putting Business Logic Directly in .razor Files
As projects grow, .razor files often turn into a mix of UI and business logic.
Why this is a problem:
• Difficult to test
• Hard to maintain
• Bloated components
Better approach:
• Use code-behind files (.razor.cs)
• Move logic into services and inject them
2.Razor files should focus on UI, not business rules.
Inconsistent or Poor Naming Conventions
Names like Test.razor, Page1.razor, or DoStuff() don’t scale.
Better approach:
• Use intention-revealing names such as InvoiceList.razor or UserProfileCard.razor
• Follow consistent naming rules across the project
Good naming reduces cognitive load immediately.
3.Copy-Pasting Logic Across Components
Duplicated logic is one of the fastest ways to introduce bugs.
Better approach:
• Extract shared logic into services
• Use dependency injection properly
Blazor’s DI system exists for a reason — use it.
4. Incorrect State Management
State-related bugs are subtle and painful.
Common issues:
• Overusing static state
• Misusing singleton services
• Losing state on refresh (especially in WASM)
Better approach:
• Understand component lifecycle
• Choose scoped vs singleton services intentionally
• Persist important state explicitly
State should be intentional, not accidental.
5. Calling APIs Directly From Components Everywhere
Direct API calls inside components create tight coupling.
Problems:
• Hard to test
• Hard to refactor
• Inconsistent error handling
Better approach:
• Create an API service layer
• Centralize retries, logging, and error handling
6.Not Handling Errors Gracefully
Unhandled exceptions can break the entire Blazor UI.
Common mistakes:
• No try/catch around async calls
• No user-friendly error messages
Better approach:
• Handle exceptions intentionally
• Use error boundaries
• Log errors properly
7.Poor Folder Structure
Flat folder structures work only for demos.
Better approach:
• Use feature-based folders
• Separate Pages, Components, Services, and Models
Folder structure is a form of documentation.
8. Ignoring Performance Basics
Most Blazor performance problems are self-inflicted.
Common causes:
• Heavy logic in OnAfterRenderAsync
• Unnecessary re-rendering
• Large component trees
Better approach:
• Minimize re-renders
• Use @key correctly
• Measure before optimizing
9. Hardcoding Configuration Values
Hardcoded URLs and keys appear far too often.
Better approach:
• Use appsettings.json
• Environment-specific configuration
• Never store secrets in UI code
Treating Blazor Like a JavaScript Framework
10.Blazor is not React or Angular.
Better approach:
• Embrace C# and .NET strengths
• Use strong typing and services
• Leverage the .NET ecosystem
Further Reading
This article is adapted from my book:
Blazor 10 Coding Standards & Best Practices
Full details and links:
Get the book on Amazon USA: https://lnkd.in/gdFV8btm
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