/// <summary>
/// 扩展HtmlHelper
/// </summary>
/// <param name="html"></param>
/// <param name="pagingInfo"></param>
/// <param name="pageUrl">根据页面索引生成url的委托</param>
/// <returns>分页链接</returns>
public static MvcHtmlString PageLinks(this HtmlHelper html, PagingInfo pagingInfo, Func<int, string> pageUrl)
{
StringBuilder result = new StringBuilder();
for (int i = 1; i <= pagingInfo.TotalPage; i++)
{
TagBuilder tag = new TagBuilder("a"); //创建一个<a>标签
tag.MergeAttribute("href", pageUrl(i)); //设置a标签的href属性
tag.InnerHtml = i.ToString(); //设置a标签的文本节点
if (i==pagingInfo.CurrentPage) //设置当前页的Class
{
tag.AddCssClass("selected");
}
result.Append(tag.ToString());
}
return MvcHtmlString.Create(result.ToString());
}
public void Can_Generate_Page_Links()
{
//布置——定义一个HTML辅助器方法
HtmlHelper myHelper = null;
//布置——创建PagingInfo数据
PagingInfo pagingInfo = new PagingInfo
{
CurrentPage = 2,
TotalItems = 28,
ItemsPerPage = 10
};
//布置——建立委托
Func<int, string> pageUrlDelegate = i => "Page" + i;
//动作
MvcHtmlString result = myHelper.PageLinks(pagingInfo, pageUrlDelegate);
//断言
Assert.AreEqual(result.ToString(),@"<a href=""Page1"">1</a><a class=""selected"" href=""Page2"">2</a><a href=""Page3"">3</a>");
}