ASP.NET пейджинг. (Paging in ASP.NET)

namespace MyService.Data
{
///

[DataContract]
[Serializable]
public class PagingInformation
{
///

/// page index to show /// page size to show (amount of entries per page index) ///
static public PagingInformation CreateClientPaging(int index, int size)
{
var pageInfo = new PagingInformation();
pageInfo.PageIndex = index;
pageInfo.RecordsPerPage = size;
return pageInfo;
}
///

[DataMember]
public long? Count { get; set; }

///

[DataMember]
public int? RecordsPerPage { get; set; }

///

[DataMember]
public int? PageIndex { get; set; }
///

public int PageCount
{
get
{
if (!Count.HasValue || !RecordsPerPage.HasValue)
{
throw new InvalidOperationException("Invalid initialization of count or recordsAmount value");
}

decimal numOfPages = (decimal)Count.Value / (decimal)RecordsPerPage.Value;
numOfPages = Math.Ceiling(numOfPages);
return (int)numOfPages;

namespace MyService.Data
{
///

///
[DataContract]
[Serializable]
public class PagingListPair
{
///

[DataMember]
public PagingInformation PagingInformation { get; set; }

public event EventHandler

TotalRowCountAvailable;

public void SetPageProperties(int startRowIndex, int maximumRows, bool databind)
{
_startIndex = startRowIndex;
_maxRows = maximumRows;
}

namespace MyControls
{
public enum SpecialPagingButtons
{
Prev, Next, First, Last
}
public class ResultListPager : Control, INamingContainer
{
public static int PageCountFromItems(int itemCount, int itemsPerPage) {
return (int)Math.Ceiling((0.0+itemCount)/itemsPerPage);
}

public event EventHandler PageIndexChanged;
private void OnPageIndexChanged()
{
if (PageIndexChanged != null)
{
PageIndexChanged(this, EventArgs.Empty);
}
}

public int CurrentPageIndex
{
get
{
if (ViewState["CurrentPageIndex"] == null)
ViewState["CurrentPageIndex"] = 0;
return (int)ViewState["CurrentPageIndex"];
}
set
{
if (CurrentPageIndex != value)
{
if ((value < 0) && (PageCount > 1))
{
throw new Exception("CurrentPageIndex must be greater than -1 if PagesCount is greater than 0");
}
if ((value > (PageCount - 1)) || (value < 0)) { throw new Exception("CurrentPageIndex is out of range"); } ViewState["CurrentPageIndex"] = value; } } } public int PageCount { get { if (ViewState["PageCount"] == null) ViewState["PageCount"] = 0; return (int)ViewState["PageCount"]; } set { if (PageCount != value) { if (value < 0) { throw new Exception("PageCount can not be smaller than zero."); } ViewState["PageCount"] = value; } } } int pageButtonCount = 3; public int PageButtonCount { get { return pageButtonCount; } set { if (value < 3) { throw new Exception("PageButtonCount can not be smaller than 3"); } pageButtonCount = value; } } bool showPrevNext = true; public bool ShowPrevNext { get { return showPrevNext; } set { showPrevNext = value; } } bool showFirstLast = true; public bool ShowFirstLast { get { return showFirstLast; } set { showFirstLast = value; } } protected virtual string GetItemStyle(int index) { return (index == CurrentPageIndex)?"item-selected":"item"; } protected virtual LinkButton CreateItem(string id, int idd) { return new LinkButton() { Text = (idd+1).ToString(), CssClass = GetItemStyle(idd) }; } protected virtual LinkButton CreateSpacialItem(string id, SpecialPagingButtons btn) { var ret = new LinkButton(); switch (btn) { case SpecialPagingButtons.Prev: ret.Text = "<"; ret.CssClass = GetItemStyle(CurrentPageIndex - 1); break; case SpecialPagingButtons.Next: ret.Text = ">";
ret.CssClass = GetItemStyle(CurrentPageIndex + 1);
break;
case SpecialPagingButtons.First:
ret.Text = "«";
ret.CssClass = GetItemStyle(0);
break;
case SpecialPagingButtons.Last:
ret.Text = "»";
ret.CssClass = GetItemStyle(PageCount-1);
break;
default:
break;
}
return ret;
}

private void AddSpecialItem(SpecialPagingButtons type) {
var id = "pg_" + type.ToString();
var linkButton = CreateSpacialItem(id, type);
linkButton.ID = id;
linkButton.Click += new EventHandler(specLinkButton_Click);
this.Controls.Add(linkButton);
}

protected override void CreateChildControls()
{
this.Controls.Clear();
this.ClearChildViewState();

var range = CalculateRange();
if (range.Length <= 1) return; if (CurrentPageIndex > 0 && ShowFirstLast) AddSpecialItem(SpecialPagingButtons.First);
if (CurrentPageIndex > 0 && ShowPrevNext) AddSpecialItem(SpecialPagingButtons.Prev);

foreach (int i in range)
{
var id = "pg_" + i.ToString();
var linkButton = CreateItem(id, i);
linkButton.ID = id;
linkButton.Click += new EventHandler(linkButton_Click);
this.Controls.Add(linkButton);
}

if (CurrentPageIndex 0)
{
writer.Write("

");
}
}

void specLinkButton_Click(object sender, EventArgs e)
{
var btn = (SpecialPagingButtons)Enum.Parse(typeof(SpecialPagingButtons), (sender as LinkButton).ID.Substring(3));