.net 基于DependencyKey清理缓存

根据datetime值，我将值插入缓存：

Dim Value1 As String = "value1"
Dim Value2 As String = "value2"
Dim Key1 As String = "Key" & New Date(2014, 1, 1, 1, 1, 0).ToString
Dim Key2 As String = "Key" & New Date(2014, 1, 1, 1, 2, 0).ToString
HttpContext.Current.Cache.Insert(Key1, Value1)
HttpContext.Current.Cache.Insert(Key2, Value2)

HttpContext.Current.Cache.Remove("OtherKey")

是否可以使用另一个缓存项作为CacheDependency使这些缓存项无效

我尝试了以下方法，但不起作用：

Dim Keys As String() = New String(0) {}
Keys(0) = "OtherKey"
Dim MyDependency As New System.Web.Caching.CacheDependency(Nothing, Keys)
HttpContext.Current.Cache.Insert(Key1, Value1, MyDependency)
HttpContext.Current.Cache.Insert(Key2, Value2, MyDependency)

'To clear all cache items:
HttpContext.Current.Cache.Remove("OtherKey")

---

当我使用这个（没有remove语句）时，在缓存中永远找不到这些项。我在这里做错了什么？

如果要将CacheDependency用于另一个缓存键：

• 必须在缓存中找到您所依赖的密钥（即OtherKey）（请参阅）。否则，将无法在缓存中找到您的项目
• 您需要为每个项创建不同的CacheDependency实例。否则，您将得到错误

  尝试从多个缓存条目引用CacheDependency对象（请参阅的答案）

因此，插入项目的代码如下所示：

' Make sure OtherKey is found in the cache
HttpContext.Current.Cache.Insert("OtherKey", "SomeValue")

' Add the items with a different CacheDependency instance per item
Dim Keys As String() = New String(0) {}
Keys(0) = "OtherKey"
HttpContext.Current.Cache.Insert(Key1, Value1, New System.Web.Caching.CacheDependency(Nothing, Keys))
HttpContext.Current.Cache.Insert(Key2, Value2, New System.Web.Caching.CacheDependency(Nothing, Keys))

• 请注意，如果不使用key OtherKey添加缓存项，则将永远找不到依赖项

然后，当您从缓存中删除OtherKey时，依赖项将自动删除。因此，此行将自动从缓存中删除Key1和Key2：

Dim Value1 As String = "value1"
Dim Value2 As String = "value2"
Dim Key1 As String = "Key" & New Date(2014, 1, 1, 1, 1, 0).ToString
Dim Key2 As String = "Key" & New Date(2014, 1, 1, 1, 2, 0).ToString
HttpContext.Current.Cache.Insert(Key1, Value1)
HttpContext.Current.Cache.Insert(Key2, Value2)

HttpContext.Current.Cache.Remove("OtherKey")

希望有帮助