Commits on Apr 10, 2018

1. Remove old workaround @OnClick and @Bind …

   This change removes support for the old syntax used for event handlers
   and two-way binding.
   
   See the relevant issues for details on the new features and
   improvements:
   
   bind https://github.com/aspnet/Blazor/issues/409
   event handlers https://github.com/aspnet/Blazor/issues/503
   
   Along with this change we've removed a few additional things Blazor
   could do that aren't part of Razor's usual syntax.
   
   ----
   
   The features that was used to make something like:
   ```
   <button @OnClick(...) />
   ```
   
   is an expression that's embedded in a an element's attribute. This
   feature might be useful in the future if we want to support 'splatting'
   arbitrary attributes into a tag, but the runtime support for this isn't
   accessible outside the Blazor core.
   
   ----
   
   The features that implement:
   ```
   <button onclick=@{ } />
   ```
   
   have been removed in favor of a better design for lambdas, method group
   conversions and other things for event handler attributes.
   
   use `<button onclick=@(x => ...} />` instead.
   
   We think is a better approach in general, because we want the app
   developer to write and see the parameter list.
   
   ----
   
   Both syntactic features that have been removed have dedicated error
   messages in the compiler. If you're porting old code it should help you
   figure out what to do.

   

   rynowak authored and Ryan Nowak committed Apr 10, 2018
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