Blazor: add a @bind-value:before event

[BISmb]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I would like to specify a before binding function so I can capture state before a binding operation is performed

Describe the solution you'd like

I think since @bind-Value:after exists as an attribute for various inputs than @bind-Value:before would not seem out of place.

Additional context

I would like to capture pre-binding changes for models and implement "undo" functionality. This would replace INotifyProperyChanged within blazor for this use case.

[javiercn]

@BISmb thanks for contacting us.

@bind:set already allows you to do that. We don't plan to introduce an additional directive for this.

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