這是一個很好的解決方案。我只建議使用這些設置創建一個強類型類併爲它們使用緩存。
緩存服務:
public class CacheService
{
private ObjectCache Cache
{
get { return MemoryCache.Default; }
}
public object Get(string key)
{
return Cache[key];
}
public void Set(string key, object data, int cacheTime)
{
CacheItemPolicy policy = new CacheItemPolicy();
policy.AbsoluteExpiration = DateTime.Now.AddMinutes(cacheTime);
Cache.Add(new CacheItem(key, data), policy);
}
public bool IsSet(string key)
{
return (Cache[key] != null);
}
public void Invalidate(string key)
{
Cache.Remove(key);
}
}
AppSetting:
public class AppSetting
{
public const string StrSettingKey = "StrSetting";
private CacheService CacheService { get; set; }
private DbContext DbContext { get; set; }
public AppSetting(ICacheService cache, DbContext db)
{
CacheService = CacheService;
DbContext = db;
}
public string StrSetting
{
get
{
if (CacheService.IsSet(StrSettingKey))
{
return (string) CacheService.Get(StrSettingKey);
}
else
{
var value = DbContext.Settings.Single(s => s.Name == StrSettingKey).Select(s => s.Value);
CacheService.Set(StrSettingKey, value, 60); //one hour
return value;
}
}
set
{
var item = DbContext.Settings.Single(s => s.Name == StrSettingKey);
item.Value = value;
DbContext.SaveChanges();
CacheService.Set(StrSettingKey, value);
}
}
}
你能給出如何構造類的一些示例代碼? – 2012-02-10 15:13:28