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Required Blazor parameters #22696

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guardrex merged 3 commits into from
Jul 15, 2021
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Required Blazor parameters #22696

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Required Blazor parameters
guardrex Jul 9, 2021
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guardrex Jul 9, 2021
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guardrex Jul 15, 2021
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19 changes: 19 additions & 0 deletions aspnetcore/blazor/components/index.md
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Expand Up @@ -513,6 +513,25 @@ public DateTime StartData { get; set; } = DateTime.Now;

After the initial assignment of <xref:System.DateTime.Now?displayProperty=nameWithType>, do **not** assign a value to `StartData` in developer code. For more information, see the [Overwritten parameters](#overwritten-parameters) section of this article.

::: moniker range=">= aspnetcore-6.0"

Apply the `[EditorRequired]` attribute to specify a required component parameter. If a parameter value isn't provided, editors or build tools may display warnings to the user. This attribute is only valid on properties also marked with the `[Parameter]` attribute. The `[EditorRequired]` attribute is enforced at design-time and when the app is built. The attribute isn't enforced at runtime, and it doesn't guarantee a non-`null` parameter value.

```csharp
[Parameter]
[EditorRequired]
public string Title { get; set; }
```

Single-line attribute lists are also supported:

```csharp
[Parameter, EditorRequired]
public string Title { get; set; }
```

::: moniker-end

## Route parameters

Components can specify route parameters in the route template of the [`@page`][9] directive. The [Blazor router](xref:blazor/fundamentals/routing) uses route parameters to populate corresponding component parameters.
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