다음을 통해 공유

방법: 요청에 캐시 정책 설정

  • 아티클

다음 예제에서는 요청에 대한 캐시 정책을 설정하는 방법을 보여 줍니다. 예제 입력은 http://www.contoso.com/ 등의 URI입니다.

예시

다음 코드 예제에서는 리소스가 캐시에 포함된 기간이 하루를 초과하지 않으면 캐시에서 요청된 리소스를 사용하도록 허용하는 캐시 정책을 만듭니다. 예제에서는 리소스가 캐시에서 사용되었는지 여부를 나타내는 메시지(예: "The response was retrieved from the cache : False.")를 표시하고 나서 리소스를 표시합니다. 클라이언트와 서버 간에 캐시를 통해 요청을 수행할 수 있습니다.

using System;  
using System.Net;  
using System.Net.Cache;  
using System.IO;  
  
namespace Examples.System.Net.Cache  
{  
    public class CacheExample  
    {
        public static void UseCacheForOneDay(Uri resource)  
        {  
            // Create a policy that allows items in the cache  
            // to be used if they have been cached one day or less.  
            HttpRequestCachePolicy requestPolicy =
                new HttpRequestCachePolicy (HttpCacheAgeControl.MaxAge,  
                TimeSpan.FromDays(1));  
  
            WebRequest request = WebRequest.Create (resource);  
            // Set the policy for this request only.  
            request.CachePolicy = requestPolicy;  
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
            // Determine whether the response was retrieved from the cache.  
            Console.WriteLine ("The response was retrieved from the cache : {0}.",  
               response.IsFromCache);  
            Stream s = response.GetResponseStream ();  
            StreamReader reader = new StreamReader (s);  
            // Display the requested resource.  
            Console.WriteLine(reader.ReadToEnd());  
            reader.Close ();  
            s.Close();  
            response.Close();  
        }  
        public static void Main(string[] args)  
        {  
            if (args == null || args.Length != 1)  
            {  
                Console.WriteLine ("You must specify the URI to retrieve.");  
                return;  
            }  
            UseCacheForOneDay (new Uri(args[0]));  
        }  
    }  
}  

Imports System  
Imports System.Net  
Imports System.Net.Cache  
Imports System.IO  
Namespace Examples.System.Net.Cache  
    Public Class CacheExample  
        Public Shared Sub UseCacheForOneDay(ByVal resource As Uri)  
            ' Create a policy that allows items in the cache  
            ' to be used if they have been cached one day or less.  
            Dim requestPolicy As New HttpRequestCachePolicy _  
                  (HttpCacheAgeControl.MaxAge, TimeSpan.FromDays(1))  
            Dim request As WebRequest = WebRequest.Create(resource)  
            ' Set the policy for this request only.  
            request.CachePolicy = requestPolicy  
            Dim response As HttpWebResponse = _  
             CType(request.GetResponse(), HttpWebResponse)  
            ' Determine whether the response was retrieved from the cache.  
            Console.WriteLine("The response was retrieved from the cache : {0}.", _  
                response.IsFromCache)  
            Dim s As Stream = response.GetResponseStream()  
            Dim reader As New StreamReader(s)  
            ' Display the requested resource.  
            Console.WriteLine(reader.ReadToEnd())  
            reader.Close()  
            s.Close()  
            response.Close()  
        End Sub  
        Public Shared Sub Main(ByVal args() As String)  
            If args Is Nothing OrElse args.Length <> 1 Then  
                Console.WriteLine("You must specify the URI to retrieve.")  
                Return  
            End If  
            UseCacheForOneDay(New Uri(args(0)))  
        End Sub  
    End Class  
End Namespace

참고 항목