Tag Helpers: Build HtmlHelper equivalent tag helper defaults.

[NTaylorMullen]

This will essentially end up being what our tag helpers look like in replacement of @Html.Foo constructs.

NOTE: May break this issue out into multiple sub-issues when the time comes.

Pre-requisites: #688

[dougbu]

Pieces include:

• add ModelExpression class to support Expression<Func<TModel, TValue>> properties; Tag Helpers: add ModelExpression class to support Expression<Func<TModel, TValue>> properties #1240 @dougbu
• add code generation for ModelExpression instances i.e. Razor runtime support; Tag Helpers: add code generation for ModelExpression instances #1241 @NTaylorMullen
• create a sample .cshtml file showing expected MVC tag helpers and their usage; Tag Helpers: create a sample .cshtml file showing expected MVC tag helpers and their usage #1242 @dougbu
• create a new project in the MVC repository to hold <textarea/> and other MVC tag helpers; Tag Helpers: create a new project in the MVC repository to hold <textarea/> and other MVC tag helpers #1243 @dougbu (part of the <textarea/> work item)
• <textarea/> tag helper (simpler than <input/> but uses same Razor infrastructure as well as ModelExpression); Tag Helpers: <textarea/> tag helper #1244 @dougbu
• <input/> tag helper; Tag Helpers: <input/> tag helper #1245 @dougbu
• <form/> tag helper; Tag Helpers: <form/> tag helper #1246 @NTaylorMullen
• <a/> tag helper (action / route links); Tag Helpers: <a/> tag helper #1247 @NTaylorMullen
• <select/> tag helper; Tag Helpers: <select/> tag helper #1248 @dougbu
• <label/> tag helper; Tag Helpers: <label/> tag helper #1249 @NTaylorMullen or @dougbu
• <validation-message/> tag helper (corresponds to @Html.ValidationMessageFor()); Tag Helpers: <validation-message/> tag helper #1250 @NTaylorMullen or @dougbu
• <validation-summary/> tag helper (corresponds to @Html.ValidationSummary()); Tag Helpers: <validation-summary/>` tag helper #1251 @NTaylorMullen or @dougbu
• (later) add design-time support for ModelExpression instances and reasonable Expression<Func<TModel, TValue>> IntelliSense; Tag Helpers: support ModelExpression IntelliSense #1252
• (later) add support for leading @ in expression the user types; Tag Helpers: add support for @ in a tag helper attribute value #1253

Example open question:

• should the helper methods exposed from Microsoft.AspNet.Mvc.Core be static in HtmlHelper, members of a new static class, or refactored into a new class (perhaps found in DI)?

[dougbu]

Nothing left in this item that is not covered in the sub-items.