/// <summary>
/// Extract a valid page number.
/// </summary>
/// <param name="controller">Target controller.</param>
/// <param name="page">Nullable page number.</param>
/// <returns>One (1) if page is null or less than one, otherwise page value.</returns>
public static int ExtractValidPage(this ContentBaseController controller, int?page)
{
if (!page.HasValue || page.Value < 1)
{
return(1);
}
return(page.Value);
}
/// <summary>
/// Generate url template that suports paging.
/// </summary>
/// <param name="controller">Target controller.</param>
/// <param name="pageUrl">Base url for paging.</param>
/// <param name="urlKeyPrefix">Query parameter sufix.</param>
/// <returns>Url suffix.</returns>
public static string GeneratePagingTemplate(this ContentBaseController controller, string pageUrl, string urlKeyPrefix)
{
if (urlKeyPrefix.IsNullOrWhitespace())
{
return(string.Concat(pageUrl, "/{0}", SystemManager.CurrentHttpContext.Request.QueryString.ToQueryString(true)));
}
var key = string.Format(KeyFormat, urlKeyPrefix);
var queryParams = HttpUtility.ParseQueryString(SystemManager.CurrentHttpContext.Request.Url.Query);
queryParams[key] = "{0}";
var queryParamsRaw = HttpUtility.UrlDecode(queryParams.ToQueryString(true));
return(string.Concat(SystemManager.CurrentHttpContext.Request.Url.LocalPath, queryParamsRaw));
}
/// <summary>
/// Check query params and update page if applicable.
/// </summary>
/// <param name="controller">Target controller.</param>
/// <param name="page">The page.</param>
/// <param name="urlKeyPrefix">Prefix of page query parameter.</param>
public static void UpdatePageFromQuery(this ContentBaseController controller, ref int?page, string urlKeyPrefix)
{
if (urlKeyPrefix.IsNullOrWhitespace())
{
return;
}
var key = string.Format(KeyFormat, urlKeyPrefix);
var pageString = SystemManager.CurrentHttpContext.Request.QueryStringGet(key);
int queryPage;
if (!int.TryParse(pageString, out queryPage))
{
queryPage = 1;
}
page = queryPage;
}