问

如何从另一个Controller(ASP.NET Web API CacheOutput库)中使Web API缓存无效

Eva---LiuJ 发布于 2022-12-07 13:10

asp.net

我已经将ASP.NET Web API CacheOutput库用于我的web.net的asp.net项目并且它工作正常,但是我有一个POST方法的另一个控制器,我想从该控制器使我的缓存无效.

[AutoInvalidateCacheOutput]
public class EmployeeApiController : ApiController
{ 
    [CacheOutput(ClientTimeSpan = 100, ServerTimeSpan = 100)]
    public IEnumerable GetData()
    {
        //Code here
    }
}


public class EmployeesController : BaseController
{
    [HttpPost]
    public ActionResult CreateEmployee (EmployeeEntity empInfo)
    {
        //Code Here
    }
}

我希望在员工控制器中添加\ update时使Employees Cache无效.

1 个回答

这有点棘手,但你可以用这种方式得到它:

1.在您的WebApiConfig上:

// Registering the IApiOutputCache.    
var cacheConfig = config.CacheOutputConfiguration();
cacheConfig.RegisterCacheOutputProvider(() => new MemoryCacheDefault());

我们需要它来从GlobalConfiguration.Configuration.Properties获取IApiOutputCache,如果我们让默认属性的设置发生,那么在MVC BaseController请求中不存在IApiOutputCache的属性.

2.创建WebApiCacheHelper类:

using System;
using System.Web.Http;
using WebApi.OutputCache.Core.Cache;
using WebApi.OutputCache.V2;

namespace MideaCarrier.Bss.WebApi.Controllers
{
    public static class WebApiCacheHelper
    {
        public static void InvalidateCache<T, U>(Expression<Func<T, U>> expression)
        {
            var config = GlobalConfiguration.Configuration;

            // Gets the cache key.
            var outputConfig = config.CacheOutputConfiguration();
            var cacheKey = outputConfig.MakeBaseCachekey(expression);

            // Remove from cache.
            var cache = (config.Properties[typeof(IApiOutputCache)] as Func<IApiOutputCache>)();
            cache.RemoveStartsWith(cacheKey);
        }
    }
}

3.然后,从EmployeesController.CreateEmployee操作中调用它:

public class EmployeesController : BaseController
{
    [HttpPost]
    public ActionResult CreateEmployee (EmployeeEntity empInfo)
    {
        // your action code Here.
        WebApiCacheHelper.InvalidateCache((EmployeeApiController t) => t.GetData());
    }
}

2022-12-11 03:12 回答

lnssm

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