C# 如何清除asp.net中的服务器缓存？
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How do I clear the server cache in asp.net?
提问by xarzu
How do I clear the server cache in asp.net? I have found out that there are two kinds of the cache. There is the browser cache and the server cache. I have done some searching but I have yet to find a clear, step-by-step guide for clearing the server cache using asp.net (or not).
如何清除asp.net中的服务器缓存？我发现有两种缓存。有浏览器缓存和服务器缓存。我已经进行了一些搜索，但我还没有找到使用 asp.net（或不使用）清除服务器缓存的清晰、分步指南。
(update) I just learned that the code-behind for this is in VB - Visual Basic (dot net).
（更新）我刚刚了解到此代码隐藏在 VB 中 - Visual Basic（点网）。
回答by Kenneth
You could loop through all the cache items and delete them one by one:
您可以遍历所有缓存项并一一删除它们：
foreach (System.Collections.DictionaryEntry entry in HttpContext.Current.Cache){
HttpContext.Current.Cache.Remove(string(entry.Key));
}
Syntax Correction for ASP.NET 4.5 C#
ASP.NET 4.5 C# 的语法更正
foreach (System.Collections.DictionaryEntry entry in HttpContext.Current.Cache){
HttpContext.Current.Cache.Remove((string)entry.Key);
}
回答by Giorgio Minardi
You'll need to remove the items you've added to the cache:
您需要删除已添加到缓存中的项目：
var itemsInCache= HttpContext.Current.Cache.GetEnumerator();
while (itemsInCache.MoveNext())
{
HttpContext.Current.Cache.Remove(enumerator.Key);
}
回答by Greg
I'm not sure of the exact methodology in which you would like to accomplish this. But there are a few ways, one way is the one Giorgio Minardi posted which comes from this question.
我不确定您想要完成此操作的确切方法。但是有几种方法，一种方法是 Giorgio Minardi 发布的一种方法，它来自这个问题。
The other choices could be like this:
其他选择可能是这样的：
using Microsoft.Web.Administration;
public bool RecycleApplicationPool(string appPoolName)
{
try
{
using (ServerManager iisManager = new ServerManager())
{
iisManager.ApplicationPools[appPoolName].Recycle();
return true;
}
}
catch (Exception ex)
{
throw new Exception("Unhandled Exception");
}
}
That will successfully recycle your application pool. Which would clear the cache. You've got a few choices. Beware, though this will clear the cache it will also terminate any sessions that exists.
这将成功回收您的应用程序池。这将清除缓存。你有几个选择。请注意，虽然这会清除缓存，但它也会终止任何存在的会话。
Hopefully this helps.
希望这会有所帮助。
回答by J W
There is a problem with iteration: it's not thread safe. If you are iterating, and the cache gets accessed from another thread, you might be getting an error. The probability of this is low, but it's a problem with high load applications. FYI, some cache implementations don't even provide iteration methods.
迭代存在一个问题：它不是线程安全的。如果您正在迭代，并且从另一个线程访问缓存，您可能会收到错误消息。这种可能性很小，但对于高负载应用程序来说是一个问题。仅供参考，某些缓存实现甚至不提供迭代方法。
Also, if you are clearing your cache items, you don't want to clear everything from every part of the app domain, but just what's related to you.
此外，如果您要清除缓存项，您不希望清除应用程序域每个部分的所有内容，而只想清除与您相关的内容。
When I faced this problem, I solved it by adding a custom CacheDependency to all my cache entries.
当我遇到这个问题时，我通过向所有缓存条目添加自定义 CacheDependency 来解决它。
This is how the CacheDependency is defined:
这是 CacheDependency 的定义方式：
public class CustomCacheDependency : CacheDependency
{
//this method is called to expire a cache entry:
public void ForceDependencyChange()
{
this.NotifyDependencyChanged(this, EventArgs.Empty);
}
}
//this is how I add objects to cache:
HttpContext.Current.Cache.Add(key, //unique key
obj,
CreateNewDependency(), //the factory method to allocate a dependency
System.Web.Caching.Cache.NoAbsoluteExpiration,
new TimeSpan(0, 0, ExpirationInSeconds),
System.Web.Caching.CacheItemPriority.Default,
ReportRemovedCallback);
//A list that holds all the CustomCacheDependency objects:
#region dependency mgmt
private List<CustomCacheDependency> dep_list = new List<CustomCacheDependency>();
private CustomCacheDependency CreateNewDependency()
{
CustomCacheDependency dep = new CustomCacheDependency();
lock (dep_list)
{
dep_list.Add(dep);
}
return dep;
}
//this method is called to flush ONLY my cache entries in a thread safe fashion:
private void FlushCache()
{
lock (dep_list)
{
foreach (CustomCacheDependency dep in dep_list) dep.ForceDependencyChange();
dep_list.Clear();
}
}
#endregion
回答by Pavel Nazarov
System.Web.HttpRuntime.UnloadAppDomain() - restarts web application, clears cache, resets css/js bundles
System.Web.HttpRuntime.UnloadAppDomain() - 重新启动 Web 应用程序，清除缓存，重置 css/js 包
回答by Faisal Pathan
public void ClearCacheItems()
{
List<string> keys = new List<string>();
IDictionaryEnumerator enumerator = Cache.GetEnumerator();
while (enumerator.MoveNext())
keys.Add(enumerator.Key.ToString());
for (int i = 0; i < keys.Count; i++)
Cache.Remove(keys[i]);
}
回答by Bhushan Shimpi
add this code on page load event ..that is http headers to clear cache.
在页面加载事件上添加此代码..即清除缓存的 http 标头。
Response.CacheControl = "private"
Response.CacheControl = "no-cache"
Response.ClearHeaders()
Response.AppendHeader("Cache-Control", "no-cache")
Response.AppendHeader("Cache-Control", "private")
Response.AppendHeader("Cache-Control", "no-store")
Response.AppendHeader("Cache-Control", "must-revalidate")
Response.AppendHeader("Cache-Control", "max-stale=0")
Response.AppendHeader("Cache-Control", "post-check=0")
Response.AppendHeader("Cache-Control", "pre-check=0")
Response.AppendHeader("Pragma", "no-cache")
Response.AppendHeader("Keep-Alive", "timeout=3, max=993")
Response.AppendHeader("Expires", "Mon, 26 Jul 2006 05:00:00 GMT")
