Component-Based Development in Blazor
Blazor is a web UI framework from Microsoft that allows developers to build interactive web applications using C# instead of JavaScript. At the heart of Blazor is component-based development, a modern approach used by frameworks like React, Angular, and Vue.
What Is a Component in Blazor?
A Blazor component is a reusable piece of UI that can contain:
Markup (HTML)
C# logic
Event handlers
Styling (CSS)
Parameters for data input
Child components
Each component is typically defined in a .razor file.
Example component (Counter.razor):
<h3>Counter</h3>
<p>Current count: @count</p>
<button class="btn btn-primary" @onclick="IncrementCount">Increment</button>
@code {
private int count = 0;
private void IncrementCount()
{
count++;
}
}
Key Features of Component-Based Development in Blazor
1. Reusability
Components can be reused across pages:
<Counter />
<Counter />
Each instance has its own state.
2. Component Parameters
Components accept data using parameters.
Parent (Parent.razor):
<Child Message="Hello from parent!" />
Child (Child.razor):
<p>@Message</p>
@code {
[Parameter]
public string Message { get; set; }
}
3. Event Callbacks
Components can notify parents of events.
Child:
<button @onclick="NotifyParent">Click Me</button>
@code {
[Parameter]
public EventCallback OnClicked { get; set; }
private async Task NotifyParent()
{
await OnClicked.InvokeAsync();
}
}
Parent:
<Child OnClicked="OnChildClicked" />
@code {
private void OnChildClicked()
{
Console.WriteLine("Child was clicked!");
}
}
4. Data Binding
Blazor supports one-way and two-way binding.
One-way binding:
<p>@value</p>
Two-way binding:
<input @bind="value" />
@code {
private string value = "Hello";
}
5. Lifecycle Methods
Components have lifecycle events such as:
OnInitialized
OnParametersSet
OnAfterRender
Example:
@code {
protected override void OnInitialized()
{
// Run logic when component initializes
}
}
6. Nested Components
Components can contain other components, making UI maintainable and modular.
Example:
<Header />
<Sidebar />
<MainContent />
<Footer />
7. Routing
Blazor components can represent pages by adding a route:
@page "/about"
<h3>About Us</h3>
8. Dependency Injection in Components
Components can inject services:
@inject WeatherService WeatherService
<p>Temperature: @WeatherService.Temperature</p>
Benefits of Component-Based Development in Blazor
✔ Separation of concerns
UI and logic stay together in a component.
✔ Reusability
Write once, use anywhere.
✔ Testability
Components can be tested independently.
✔ Maintainability
Smaller components are easier to maintain and evolve.
✔ Consistency
Shared components unify design and behavior across the app.
When to Use Components in Blazor
Use a component when you need:
A reusable UI part (e.g., button, card, form input)
A part of UI that has its own logic or state
A section that may be used across multiple pages
A modular structure within a complex page
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