HttpCacheAgeControl HttpCacheAgeControl HttpCacheAgeControl HttpCacheAgeControl Enum

定义

指定时间值的含义,这些时间值控制使用 HttpWebRequest 对象获取的资源的缓存行为。Specifies the meaning of time values that control caching behavior for resources obtained using HttpWebRequest objects.

public enum class HttpCacheAgeControl
public enum HttpCacheAgeControl
type HttpCacheAgeControl = 
Public Enum HttpCacheAgeControl
继承
HttpCacheAgeControlHttpCacheAgeControlHttpCacheAgeControlHttpCacheAgeControl

字段

MaxAge MaxAge MaxAge MaxAge 2

在内容超出用该值指定的生存期之前,可以从缓存中取出内容。Content can be taken from the cache until it is older than the age specified with this value.

MaxAgeAndMaxStale MaxAgeAndMaxStale MaxAgeAndMaxStale MaxAgeAndMaxStale 6

MaxAgeMaxStaleMaxAge and MaxStale.

MaxAgeAndMinFresh MaxAgeAndMinFresh MaxAgeAndMinFresh MaxAgeAndMinFresh 3

MaxAgeMinFreshMaxAge and MinFresh.

MaxStale MaxStale MaxStale MaxStale 4

在内容过期后到用该值指定的时间结束之前,可以将内容从缓存中取出。Content can be taken from the cache after it has expired, until the time specified with this value elapses.

MinFresh MinFresh MinFresh MinFresh 1

如果在过期前剩余的时间大于或等于用该值指定的时间,则可以将内容从缓存中取出。Content can be taken from the cache if the time remaining before expiration is greater than or equal to the time specified with this value.

None None None None 0

仅限内部使用。For internal use only. 如果您尝试使用此成员,则 Framework 将引发 ArgumentExceptionThe Framework will throw an ArgumentException if you try to use this member.

示例

下面的代码示例基于 MaxAgeAndMinFresh 创建一个策略。The following code example creates a policy based on MaxAgeAndMinFresh.

static HttpRequestCachePolicy^ CreateFreshAndAgePolicy( TimeSpan freshMinimum, TimeSpan ageMaximum )
{
   HttpRequestCachePolicy^ policy = gcnew HttpRequestCachePolicy( HttpCacheAgeControl::MaxAgeAndMinFresh,
       ageMaximum, freshMinimum );
   Console::WriteLine( policy );
   return policy;
}
public static HttpRequestCachePolicy CreateFreshAndAgePolicy(TimeSpan freshMinimum, TimeSpan ageMaximum)
{
    HttpRequestCachePolicy policy = 
        new HttpRequestCachePolicy(HttpCacheAgeControl.MaxAgeAndMinFresh, ageMaximum, freshMinimum); 
    Console.WriteLine(policy.ToString());
    return policy; 
}

注解

此枚举由HttpRequestCachePolicy类的成员用于配置缓存策略的时间值。This enumeration is used by members of the HttpRequestCachePolicy class to configure the time values for cache policies.

适用于

另请参阅