把旧系统迁移到.Net Core 2.0 日记（7) Tag Helpers /ResponseCache

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();
        
        ...
    }
}