aspnet-blazor
Blazor Server, WebAssembly, and United (Auto) with components, interop, and render modes. Covers .NET 8+ Blazor patterns. USE WHEN: user mentions "Blazor", "Blazor Server", "Blazor WASM", "Blazor WebAssembly", "Blazor components", "render modes", "Blazor interop" DO NOT USE FOR: Angular components - use `angular`, React components - use `react`, Svelte - use `svelte`
What this skill does
# ASP.NET Blazor - Quick Reference
> **Deep Knowledge**: Use `mcp__documentation__fetch_docs` with technology: `blazor` for comprehensive documentation.
## Render Modes (.NET 8+)
| Mode | Description | Use For |
|------|-------------|---------|
| `InteractiveServer` | Server-side via SignalR | Internal apps, real-time |
| `InteractiveWebAssembly` | Client-side WASM | Offline, no server dependency |
| `InteractiveAuto` | Server first, then WASM | Best of both worlds |
| Static SSR (default) | No interactivity | Content pages, SEO |
```razor
@* Page-level render mode *@
@rendermode InteractiveServer
@* Component-level *@
<Counter @rendermode="InteractiveWebAssembly" />
```
## Component Pattern
```razor
@* Counter.razor *@
<h3>Counter</h3>
<p>Count: @count</p>
<button @onclick="Increment">Click me</button>
@code {
private int count = 0;
[Parameter]
public int InitialCount { get; set; } = 0;
[Parameter]
public EventCallback<int> OnCountChanged { get; set; }
protected override void OnInitialized()
{
count = InitialCount;
}
private async Task Increment()
{
count++;
await OnCountChanged.InvokeAsync(count);
}
}
```
## Forms with Validation
```razor
<EditForm Model="user" OnValidSubmit="HandleSubmit" FormName="UserForm">
<DataAnnotationsValidator />
<ValidationSummary />
<InputText @bind-Value="user.Name" class="form-control" />
<ValidationMessage For="@(() => user.Name)" />
<InputText @bind-Value="user.Email" class="form-control" />
<ValidationMessage For="@(() => user.Email)" />
<button type="submit">Save</button>
</EditForm>
@code {
[SupplyParameterFromForm]
private UserModel user { get; set; } = new();
private async Task HandleSubmit()
{
await UserService.CreateAsync(user);
Navigation.NavigateTo("/users");
}
}
```
## JavaScript Interop
```razor
@inject IJSRuntime JS
@code {
private async Task ShowAlert()
{
await JS.InvokeVoidAsync("alert", "Hello from Blazor!");
}
private async Task<string> GetValue()
{
return await JS.InvokeAsync<string>("localStorage.getItem", "key");
}
}
```
## Dependency Injection
```razor
@inject IUserService UserService
@inject NavigationManager Navigation
@inject ILogger<UserList> Logger
```
## Anti-Patterns
| Anti-Pattern | Why It's Bad | Correct Approach |
|--------------|--------------|------------------|
| InteractiveServer for public sites | Latency, scaling | Use Auto or WASM |
| Large WASM downloads | Slow initial load | Use Auto mode |
| Direct DOM manipulation | Breaks diffing | Use Blazor bindings |
| Not disposing JS interop | Memory leaks | Implement `IAsyncDisposable` |
## Quick Troubleshooting
| Issue | Likely Cause | Solution |
|-------|--------------|----------|
| Component not interactive | Missing render mode | Add `@rendermode` directive |
| JS interop fails | WASM restriction | Use `IJSRuntime` correctly |
| State lost on navigation | No state container | Use cascading parameters or DI |
| Pre-rendering flicker | Async data on init | Use `OnInitializedAsync` with loading state |
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