Tag Helpers是Html Helpers的一种替换
比如，原来的视图模型定义是这样的：
@using (Html.BeginForm("Register", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" })){ ???@Html.AntiForgeryToken() ???<h4>Create a new account.</h4> ???<hr /> ???@Html.ValidationSummary(true, "", new { @class = "text-danger" }) ???<div class="form-group"> ???????@Html.LabelFor(m => m.UserName, new { @class = "col-md-2 control-label" }) ???????<div class="col-md-10"> ???????????@Html.TextBoxFor(m => m.UserName, new { @class = "form-control" }) ???????</div> ???</div>在新版MVC中，我们可以使用Tag Helper进行定义：
<form asp-controller="Account" asp-action="Register" method="post" class="form-horizontal" role="form"> ???<h4>Create a new account.</h4> ???<hr /> ???<div asp-validation-summary="ValidationSummary.ModelOnly" class="text-danger"></div> ???<div class="form-group"> ???????<label asp-for="UserName" class="col-md-2 control-label"></label> ???????<div class="col-md-10"> ???????????<input asp-for="UserName" class="form-control" /> ???????????<span asp-validation-for="UserName" class="text-danger"></span> ???????</div> ???</div>
这样方便了前端开发人员了，但我没什么感觉,因为我是Full Stack Develop
如果要用,可以参考这篇文章: http://www.cnblogs.com/TomXu/p/4496480.html
现在没有outputCache的attribute了, 取代的是 Microsoft.AspNetCore.ResponseCaching
[ResponseCache(VaryByHeader ="Accept-Encoding", Location = ResponseCacheLocation.Any, Duration = 10)]public IActionResult About(){}如果要用VaryByQueryKeys, 要先引用Cache中间件,否则会报错 InvalidOperationException: ‘VaryByQueryKeys‘ requires the response cache middleware.
修改 Startup.cs ，在ConfigureServices 和Configure 两个方法中添加如下代码：
public class Startup{ ???... ????public void ConfigureServices(IServiceCollection services) ???{ ???????services.AddResponseCaching(); ???????????????... ???} ????public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory) ???{ ???????app.UseResponseCaching(); ???????????????... ???}}把旧系统迁移到.Net Core 2.0 日记（7) Tag Helpers
原文地址：https://www.cnblogs.com/zitjubiz/p/net_core_daily_7.html