- remove a duplicate using of `System.Collections.Generic`
- FYI `k build` command does not detect this problem
- nit: also cleanup long lines and align wrapped parameters
- HtmlHelper service now needs an `IModelMetadataProvider` instance
- make `GetInputTypeString()` private
- use `TextBox()` and `TextBoxFor()` in MVC sample
- throw if `ExpressionMetadataProvider.FromLambdaExpression()` returns `null`
- `Name()` is a `virtual` instance method to allow useful derivation
- `NameFor()` is an instance method to avoid adding `GetExpressionName()`
to the public surface; either method could be `virtual`
- `NameForModel()` is an extension method because it's not usefully overridden
- use `Name*()` in sample
- add `IHtmlHelper<T>` and `ICanHasViewContext`
- adjust `HtmlHelper` and `HtmlHelper<T>` to match
- throw if `ViewContext` accessed prior to `Contextualize` call
- XML comments (from old world) all around
Note
- no current need for an `HtmlHelper` copy constructor or `Clone()` method
- expect recursion code to get another injected `IHtmlHelper<T>` and then
"contextualize" that instance with a new `ViewContext`