Update documentation for Optional Parameters in Routing

[gregoryagu]

This page says "Optional parameters aren't supported."

This is no longer true. See #19733

I have tested and it works great.

For example: @page "/viewpost/{code?}"

routes to the viewpost page for both of these routes:

/viewpost
'viewpost/test'

I have tested this with both SS and CS Blazor and it worked correctly.

Would suggest the following:

Remove this paragraph:

Optional parameters aren't supported. Two @page directives are applied in the previous example. The first permits navigation to the component without a parameter. The second @page directive takes the {text} route parameter and assigns the value to the Text property.

Replace with:

Optional parameters are supported by Blazor on both Server and WebAssemebly appss. Two @page directives are applied in the previous example. To reduce to one, use this syntax: @page "/RouteParameter/{text?}. This will match both /RouteParameter and /RouteParameter/optional. The first route sets the Text parameter to null (or the default value if provided as in this example), while the second route sets it to optional.

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Document Details

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• ID: 35474d24-8039-f04a-de14-1530b8e8506c
• Version Independent ID: b6cb2574-6326-a40d-0b6c-d1661328e828
• Content: ASP.NET Core Blazor routing
• Content Source: aspnetcore/blazor/fundamentals/routing.md
• Product: aspnet-core
• Technology: aspnetcore-blazor
• GitHub Login: @guardrex
• Microsoft Alias: riande