先創建一個CacheHelper.cs類，代碼如下：
using System;
using System.Web;
using System.Collections;
using System.Web.Caching;
public class CacheHelper
{
/// <summary>
/// 獲取數據緩存
/// </summary>
/// <param name="cacheKey">鍵</param>
public static object GetCache(string cacheKey)
{
var objCache = HttpRuntime.Cache.Get(cacheKey);
return objCache;
}
/// <summary>
/// 設置數據緩存
/// </summary>
public static void SetCache(string cacheKey, object objObject)
{
var objCache = HttpRuntime.Cache;
objCache.Insert(cacheKey, objObject);
}
/// <summary>
/// 設置數據緩存
/// </summary>
public static void SetCache(string cacheKey, object objObject, int timeout = 7200)
{
try
{
if (objObject == null) return;
var objCache = HttpRuntime.Cache;
//相對過期
//objCache.Insert(cacheKey, objObject, null, DateTime.MaxValue, timeout, CacheItemPriority.NotRemovable, null);
//絕對過期時間
objCache.Insert(cacheKey, objObject, null, DateTime.Now.AddSeconds(timeout), TimeSpan.Zero, CacheItemPriority.High, null);
}
catch (Exception)
{
//throw;
}
}
/// <summary>
/// 移除指定數據緩存
/// </summary>
public static void RemoveAllCache(string cacheKey)
{
var cache = HttpRuntime.Cache;
cache.Remove(cacheKey);
}
/// <summary>
/// 移除全部緩存
/// </summary>
public static void RemoveAllCache()
{
var cache = HttpRuntime.Cache;
var cacheEnum = cache.GetEnumerator();
while (cacheEnum.MoveNext())
{
cache.Remove(cacheEnum.Key.ToString());
}
}
}
引用也貼在上面了，就這麼幾個。
然後是調用：
public IEnumerable<CompanyModel> FindCompanys()
{
var cache = CacheHelper.GetCache("commonData_Company");//先讀取
if (cache == null)//如果沒有該緩存
{
var queryCompany = _base.CompanyModel();//從數據庫取出
var enumerable = queryCompany.ToList();
CacheHelper.SetCache("commonData_Company", enumerable);//添加緩存
return enumerable;
}
var result = (List<CompanyModel>)cache;//有就直接返回該緩存
return result;
}
測試結果也貼上來看看好了：
首次加載進來是爲null，然後讀取數據庫，添加進緩存，當前返回前臺的是從數據庫中取出的數據。
刷新頁面，發現緩存中已經有了讀出的30條數據，
然後接下來走，返回緩存中的數據：
