protected void AppendVaryByParamsCacheKey(CacheKey currentCacheKey, Uri uri)
{
var parameters = uri.ParseQueryString();
foreach (var param in _varyByParams)
{
if (parameters[param] != null)
{
currentCacheKey.Append(String.Format(CultureInfo.InvariantCulture, "{0}={1}", param, parameters[param]));
}
}
}
