我有一个评论列表。 客户希望在每 10 条评论后有一个新页面,因此评论 11 将出现在第 2 页上,依此类推,尽可能多的页面。 由于我在常规.aspx.cs页面上遇到的问题,Commets是在.ashx页面上形成的。 简而言之,我如何实现这一点?
以下是 .ashx 页面的代码:
public void ProcessRequest (HttpContext context)
{
// ****************************************
if (context.Request["postform"] == "1")
{
videomessage myVideoMessage = new videomessage();
myVideoMessage.video_id = context.Request["video_id"];
myVideoMessage.first_name_submitter = context.Request["first_name_submitter"];
myVideoMessage.last_initial_submitter = context.Request["last_initial_submitter"];
myVideoMessage.message = context.Request["message"];
myVideoMessage.status = "0";
myVideoMessage.Save();
}
// ****************************************
// ****************************************
StringBuilder myStringBuilder = new StringBuilder();
// PULL VIDEOMESSAGES FOR VIDEO_ID
videomessage[] myCommentsList = new videomessage().Listing("video_id", context.Request["video_id"], "entry_date" , "DESC");
// FORM COMMENTS IF MORE THAN ONE COMMENT EXISTS
foreach (videomessage tmpMessage in myCommentsList)
{
if (tmpMessage.status == "0" || tmpMessage.status == "1")
{
myStringBuilder.Append("<div class="comment_box">");
myStringBuilder.Append("<p class="comment_date">");
myStringBuilder.Append(Utility.FormatShortDate(tmpMessage.entry_date) + " " + tmpMessage.first_name_submitter + " " + tmpMessage.last_initial_submitter + "." + "</p>");
if (!String.IsNullOrEmpty(tmpMessage.message))
{
myStringBuilder.Append("<p>" + tmpMessage.message + "</p>");
myStringBuilder.Append("</div>");
}
}
}
string return_str = myStringBuilder.ToString();
// IF NO COMMENTS RETURN THIS
if( String.IsNullOrEmpty(return_str) ) return_str = "<p>No comments currently exist for this video.</p>";
// ****************************************
// RETURN STRING
context.Response.ContentType = "text/plain";
context.Response.Write(return_str);
}
我知道需要涉及一些数学并将其分配给变量,但我仍然是 .NET 的新手,因此任何帮助将不胜感激。
提前感谢!
使用 Linq
const int pageSize = 10;
var paginatedComments = comments.Skip((page ?? 0) * pageSize).Take(pageSize).ToList();
(*) 页面是从请求中输入的
也许有点过时了,但看看书教程(http://aspnetmvcbook.s3.amazonaws.com/aspnetmvc-nerdinner_v1.pdf),它描述了使用自定义PaginatedList类的MVC的分页原则
public class PaginatedList<T> : List<T> {
public int PageIndex { get; private set; }
public int PageSize { get; private set; }
public int TotalCount { get; private set; }
public int TotalPages { get; private set; }
public PaginatedList(IQueryable<T> source, int pageIndex, int pageSize) {
PageIndex = pageIndex;
PageSize = pageSize;
TotalCount = source.Count();
TotalPages = (int) Math.Ceiling(TotalCount / (double)PageSize);
this.AddRange(source.Skip(PageIndex * PageSize).Take(PageSize));
}
public bool HasPreviousPage {
get {
return (PageIndex > 0);
}
}
public bool HasNextPage {
get {
return (PageIndex+1 < TotalPages);
}
}
}
替代解决方案是使用 jquery 方法(见 http://www.jquery4u.com/plugins/10-jquery-pagination-plugins),但我对本网站建议的任何插件都没有经验。
看看这个
currentPage=1
NextPageFirstRecord=(currrentpage-1)*noRecordsPerPage
pageCount=totalrecords/noRecordsPerPage
希望这有帮助