Bound field or property expression convention

[guardrex]

Fixes #30656

cc: @AntMaster7 ... I had a few minutes to whip something up, but I'm not necessarily keen on my example and text. I say that this would have an obvious use in creating custom validation components, which isn't something that the Blazor docs here cover. This is a bit of an advanced framework feature for custom scenarios. Can you look this over along with the sample components ...

• https://github.com/dotnet/blazor-samples/blob/main/8.0/BlazorSample_BlazorWebApp/Components/ChildParameterExpression.razor
• https://github.com/dotnet/blazor-samples/blob/main/8.0/BlazorSample_BlazorWebApp/Components/Pages/Parent3.razor

... and see if you think this will at least get it covered until Mackinnon is free. He's buried in work for the next few months, and I don't want to disturb him unless absolutely necessary. I'm going to make a tracking entry to make sure that I discuss this section and example with him later. For now tho, do you think this is about what you would've needed to see for your own purposes back when you went looking for doc coverage on it?

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Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/components/data-binding.md	ASP.NET Core Blazor data binding

[guardrex]

I'm going to go ahead with this. Mackinnon will look at it later when his schedule opens up a bit.

[AntMaster7]

Thank you @guardrex. I haven't taken the time yet to look into it but the example looks good. I do not have permission however to open the preview link.

[guardrex]

Thanks! At least, this will provide a little guidance until Mackinnon can look. He may be able to provide better descriptive language.

I do not have permission however to open the preview link.

That's normal. It's for internal review by Microsoft folks.