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Cache general management class + cache httpcontext Current. Cache and httpruntime Differences between caches

2022-07-04 02:54:00 【Brother Lei talks about programming】

　　 I used to write asp.net Time use HttpContext.Current.Cache Cache is very easy to use , I wrote one today windows Service program ,HttpContext.Current.Cache It's OK when saving cache , Always report an error when taking “ Object not referenced to instance ” Very depressed. , After looking up the information, I realized that the reference program cache should be used HttpRuntime.Cache...

　　 We see first MSDN Explanation above ：

　　 HttpContext.Current.Cache： For the current HTTP The request for Cache object .

　　HttpRuntime.Cache： Gets the name of the current application Cache.

The attached write a general class of operation cache , Use... In an application , If you want to in asp.net There is , Just put HttpRuntime.Cache Change it to HttpContext.Current.Cache that will do , The code is as follows ：

Cache general management class + cache HttpContext.Current.Cache and HttpRuntime.Cache The difference between _ cache Code

        using System;
        

        
/// 
        <
        summary
        >
        
/// author:Stone_W
        
/// date:2010.12.1
        
/// desc: Cache management class 
        
///  Be careful ： To add a reference to  System.Web
        
/// 
        </
        summary
        >
        
public class MyCacheTools : System.Web.SessionState.IRequiresSessionState
        
{
        
    #region  Deposit in Cache
        
    /// 
        <
        summary
        >
        
    ///  Deposit in Cache
        
    /// 
        </
        summary
        >
        
    /// 
        <
        param 
        name=
        "key"
        > cache key
        </
        param
        >
        
    /// 
        <
        param 
        name=
        "value"
        > The value of the cache 
        </
        param
        >
        
    /// 
        <
        param 
        name=
        "time_HH"
        > save xx Hours 
        </
        param
        >
        
    /// 
        <
        returns
        > Successful execution [bool]
        </
        returns
        >
        
    public static bool SetCache(string key, object value, int time_HH)
        
    {
        
        bool result = false;
        
        try
        
        {
        
            DateTime dt = DateTime.Now.AddHours(time_HH);
        
            System.Web.HttpRuntime.Cache.Insert(key, value, null,
        
                dt, System.Web.Caching.Cache.NoSlidingExpiration);
        
            result = true;
        
        }
        
        catch (Exception ex) { }
        
        return result;
        
    }
        
    #endregion
        

        
    #region  obtain Cache
        
    /// 
        <
        summary
        >
        
    ///  obtain Cache
        
    /// 
        </
        summary
        >
        
    /// 
        <
        param 
        name=
        "key"
        >key
        </
        param
        >
        
    /// 
        <
        returns
        >object type 
        </
        returns
        >
        
    public static object GetCache(string key)
        
    {
        
        return System.Web.HttpRuntime.Cache.Get(key);
        
    }
        
    #endregion
        

        
    #region  Inquire about Cache Whether there is 
        
    /// 
        <
        summary
        >
        
    ///  Inquire about Cache Whether there is 
        
    /// 
        </
        summary
        >
        
    /// 
        <
        param 
        name=
        "key"
        >key  value 
        </
        param
        >
        
    /// 
        <
        returns
        >bool
        </
        returns
        >
        
    public static bool IsCacheExist(string key)
        
    {
        
        bool result = false;
        

        
        object temp = System.Web.HttpRuntime.Cache.Get(key);
        
        if (null != temp)
        
        {
        
            result = true;
        
        }
        
        return result;
        
    }
        
    #endregion
        

        
}
       
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ps:HttpContext.Current.Cache by null This problem makes me very painful , Finally, it was solved , I hope this article is useful to you ！

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Cache general management class + cache HttpContext.Current.Cache and HttpRuntime.Cache The difference between _ cache _03

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