public void TestPagingHelpers_Can_Generate_Page_Links()
{
// Arrange - define an HTML helper - we need to do this
// in order to apply the extension method
HtmlHelper myHelper = null;
// Arrange - create PagingInfo data
PagingInfo pagingInfo = new PagingInfo
{
CurrentPage = 2,
TotalItems = 28,
ItemsPerPage = 10
};
// Arrange - set up the delegate using a lambda expression
Func<int, string> pageUrlDelegate = i => "Page" + i;
// Act
MvcHtmlString result = myHelper.PageLinks(pagingInfo, pageUrlDelegate);
// Assert
Assert.AreEqual(result.ToString(), @"<a href=""Page1"">1</a>"
+ " | "
+ @"<a class=""selected"" href=""Page2"">2</a>"
+ " | "
+ @"<a href=""Page3"">3</a>");
}
public static MvcHtmlString PageLinks(this HtmlHelper html,
PagingInfo pagingInfo,
Func<int, string> pageUrl)
{
StringBuilder result = new StringBuilder();
for (int i = 1; i <= pagingInfo.TotalPages; i++)
{
TagBuilder tag = new TagBuilder("a"); // Construct an <a> tag
tag.MergeAttribute("href", pageUrl(i));
tag.InnerHtml = i.ToString();
if (i == pagingInfo.CurrentPage)
tag.AddCssClass("selected");
result.Append(tag.ToString());
if (i < pagingInfo.TotalPages)
{
result.Append(" | ");
}
}
return MvcHtmlString.Create(result.ToString());
}