Cache Tag Helper in ASP.Net Core MVC

Caching is a very interesting topic in any programming language. It provides drastic changes in app performance. A cache tag is provided to implement caching in the ASP.NET Core MVC.

This became possible with the tag helper features of ASP.NET Core Mvc.

What is a Cache Tag Helper?

Cache Tag Helper provides caching to the content defined within the tag. Razor syntax to define cache tag helper.

    {Data}

Cache tag helper to cached current date and time

    @DateTime.Now

Cache Tag Helper Attributes

Below are the attributes of Cache Tag Helper

• enabled: By default value of this attribute is true. If you want, you can set it to false.

  <cache enabled="true">
  Current Date and Time: @DateTime.Now
  </cache>
  
  

• expires-on: This attribute in Cache Tag Helper sets an expiration date for the cached data.

   <cache expires-on="@new DateTime(2020,7,25,18,06,0)">
   Date and Time Inside Cache Tag Helper: @DateTime.Now
   </cache>
  
  

• expires-after: Sets the time duration of the cache from the time of the very first request. The default expires after the value is twenty minutes.

  <cache expires-after="@TimeSpan.FromSeconds(60)">
  Date and Time Inside Cache Tag Helper: @DateTime.Now
  </cache>

• expires-sliding: It resets the cache expiry time as soon as a new request is raised.

  <cache expires-sliding="@TimeSpan.FromSeconds(120)">
  Date and Time Inside Cache Tag Helper: @DateTime.Now
  </cache>
  
  

• vary-by-header: It accepts the header value and resets the cache when the value is changed.

    <cache vary-by-header="User-Agent">
    Date and Time Inside Cache Tag Helper: @DateTime.Now
    </cache>
  
  

• vary-by-query: Accepts the cache from a query string. It refreshes the cache when a value is changed. It can accept one or more than one query strings.

   <cache vary-by-query="Country,City">
   Date and Time Inside Cache Tag Helper: @DateTime.Now
   </cache>
  
  

• vary-by-route: It accepts a single parameter name or multiple parameter names. It refreshes the cached data when a parameter value from route data is changed.

  routes.MapRoute(
      name: "default",
      template: "{controller=Home}/{action=Index}/{Country?}/{City?}");

          
  
   <cache vary-by-route="Country,City">
   Date and Time Inside Cache Tag Helper: @DateTime.Now
   </cache>
  
  

• vary-by-cookie: This attribute in Cache Tag Helper accepts a list of cookie names and refreshes the cached data when the value of cookies gets changed.

   <cache vary-by-cookie=".AspNetCore.Identity.Application">
   Date and Time Inside Cache Tag Helper: @DateTime.Now
   </cache>
  
  

• vary-by-user: This attribute in Cache Tag Helper is based on the logged-in user. As soon as logged in user changes then it refreshes the cache data.

   <cache vary-by-user="true">
   Date and Time Inside Cache Tag Helper: @DateTime.Now
   </cache>
  
  

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