• SharePoint List Pagination using SPListItemCollectionPosition

    SharePoint List Pagination using SPListItemCollectionPosition

    Description

    This article will show you how to apply paging with sorting on search grid which gets data from sharepoint list by using SPQuery and SPListItemCollectionPosition.

    Requirement:-

    I have search page which is divided in 2 part; Search filter criteria and other is display result in grid. This page query to sharepoint list using object model and display result.
    By thinking of performance; you will never try to get all results from sharepoint list. You have to query page by page. I mean query sharepoint list only for 10 page (page size=10) and display data.

    Here I am giving detail about how to query for 10 page and get data. Then display pagination.

    Precisely my page will do below things:-

    1. Put caml query (only for page size which is set to 10 in my example) on sharepoint list
    2. Filter on folder basis
    3. Apply sorting
    4. Display paging on search result page.

    My hunt On Google:-

    I have search on google lots but no where I find proper solution which handle sorting, paging with filter using caml query and folder query.
    But still I like msdn and below 2 blogs from where I got basic understanding
    http://www.directsharepoint.com/2011/03/step-by-step-guide-to-implement-paging.html
    http://blogs.msdn.com/b/colbyafrica/archive/2009/02/19/learning-sharepoint-part-vi-list-pagination.aspx

    The Code:  

    Below are 2 classes SearchDocuments and SearchPaging.
    SearchDocuments: This class is code behind file my user control which manage search.
    SearchPaging: This class set property for search results and search paging.

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    public partial class SearchDocuments : System.Web.UI.UserControl
{
	public string Next
	{
		get { return ViewState["Next"] == null ? string.Empty : (string)ViewState["Next"]; }
		set { ViewState["Next"] = value; }
	}
	public string Previous
	{
		get { return ViewState["Previous"] == null ? string.Empty : (string)ViewState["Previous"]; }
		set { ViewState["Previous"] = value; }
	}
	// store column name for order by query
	private string DataSortExpression
	{
		get { return ViewState["DataSortExpression"] == null ? 
			Constant.SearchResultColumnDocumentName : (string)ViewState["DataSortExpression"]; }
		set { ViewState["DataSortExpression"] = value; }
	}
	// store direction; Acending or decending for order by query
	private SortDirection DataSortDirection
	{
		get { return ViewState["DataSortDirection"] == null ? 
				SortDirection.Ascending : (SortDirection)ViewState["DataSortDirection"]; }
		set { ViewState["DataSortDirection"] = value; }
	}
 
	/// <summary>
	/// This function get call on search button and prev or next link
	/// this manage paging and grid results.
	/// </summary>
	private void BindListData(Dictionary<string, string> searchFilters, 
							string pagingInfo, int currentPageNumber)
	{
		try
		{
			ViewState["CurrentPage"] = currentPageNumber.ToString();
			uint rowCount = 10; //Page Size
 
			// below 2 string format are good if you have orderby in your caml query.
			string nextPageString = "Paged=TRUE&p_FSObjType=0&p_{0}={1}&p_ID={2}";
			string PreviousPageString = "Paged=TRUE&p_FSObjType=0&PagedPrev=TRUE&p_{0}={1}&p_ID={2}";
			/*
			  below 2 string format are good if you dont have orderby in your caml query.
			  string nextPageString = "Paged=TRUE&p_{0}={1}&p_ID={2}";
			  string PreviousPageString = "Paged=TRUE&PagedPrev=TRUE&p_{0}={1}&p_ID={2}";
	*/
			int pageOrderNumber = ((currentPageNumber - 1) * Convert.ToInt32(rowCount)) + 1;
			string orderBy = string.Empty;
			// set order by query.
			// By default DataSortExpression value is ID. but on click of sorting it change column value
			if (DataSortDirection == SortDirection.Ascending)
				orderBy = @"<OrderBy><FieldRef Name='" + 
							DataSortExpression + "' Ascending='True' /></OrderBy>";
			else
				orderBy = @"<OrderBy><FieldRef Name='" + 
							DataSortExpression + "' Ascending='False' /></OrderBy>";
 
			// it generate caml query based on my search filters
			// you can write you own logic to build caml query
			string query = GetQuery(searchFilters);
			query = string.Concat(query, orderBy); // add order by in query
			// get folder name from you search filter criteria
			string folderName = searchFilters.TryGetValue("FolderName", out folderName);
 
			// pass paging info, query row limit in below function
			// this function will return object of my custom class which hold datatable object and paging info 
			// Once current function ends; You will find detail about GetAllSearch function in this blog
			SearchPaging searchData = GetAllSearch(query, pagingInfo, rowCount, pageOrderNumber, folderName);
 
			if (searchData != null && searchData.SearchItems != null)
			{
				SPListItemCollectionPosition itemPosition = searchData.ItemCollPosition;
				// ctlGrid is a object of my SPGridView
				ctlGrid.DataSource = searchData.SearchItems;
				ctlGrid.DataBind();
				this.ResultPanel_Search.Visible = true;
 
				//now we need to identify if this is a call from next or first
				if (null != itemPosition)
				{
				   nextPageString =
				   string.Format(nextPageString, DataSortExpression, 
								archData.LastItem[DataSortExpression], searchData.LastItem.ID);
				}
				else
				{
					nextPageString = string.Empty;
				}
 
				if (currentPageNumber > 1)
				{
				  PreviousPageString =
				  string.Format(PreviousPageString, DataSortExpression, 
								searchData.FirstItem[DataSortExpression], searchData.FirstItem.ID);
				}
				else
				{
					PreviousPageString = string.Empty;
				}
 
				if (string.IsNullOrEmpty(nextPageString))
				{
					LinkButtonNext.Visible = false;
				}
				else
				{
					LinkButtonNext.Visible = true;
				}
 
				if (string.IsNullOrEmpty(PreviousPageString))
				{
					LinkButtonPrevious.Visible = false;
				}
				else
				{
					LinkButtonPrevious.Visible = true;
				}
 
				ViewState["Previous"] = PreviousPageString;
				ViewState["Next"] = nextPageString;
 
				string pageNumber = string.Empty;
 
				if (currentPageNumber == 1)
					pageNumber = Convert.ToString(((currentPageNumber - 1) * Convert.ToInt32(rowCount)) + 1);
				else
					pageNumber = Convert.ToString((currentPageNumber));
 
				lblPaging.Text = "Page - " + pageNumber;
 
				ctlContainerUpdatePanel.Update();
 
			}
			else
			{
				ctlContainerUpdatePanel.Update();
				this.ResultPanel_Search.Visible = false;
				this.ErrorMessageLabel.Text = "No records found";
			}
		}
		catch (Exception ex)
		{
			// manage exception
		}
	}
 
	/// <summary>
	/// This function query to sharepoint list and return SearchPaging class object
	/// which holde results and paging info
	/// </summary>
	private SearchPaging GetAllSearch(string queryXML, string pagingInfo, uint rowCount, 
									int pageOrderNumber, string folderName)
	{
		SPQuery query = new SPQuery();
		query.Query = queryXML;
		query.RowLimit = rowCount;
		if (!string.IsNullOrEmpty(pagingInfo))
		{
			SPListItemCollectionPosition position = new SPListItemCollectionPosition(pagingInfo);
			query.ListItemCollectionPosition = position;
		}
 
		query.ViewFields = string.Concat(
			"<FieldRef Name='ID' />",
				   "<FieldRef Name='Title' />");
 
		// assign folder name
		if (!String.IsNullOrEmpty(folderName))
		{
			SPFolder searchFolder = list.RootFolder.SubFolders[folderName];
			query.Folder = searchFolder;
			query.ViewAttributes = "Scope="Recursive"";
		}
 
		SPListItemCollection itemColl = list.GetItems(query);
 
		// SearchPaging is my custom class which have some get set. 
		// i have copied code of this class in bottom for your reference
 
		SearchPaging searchPaging = new SearchPaging(itemColl.GetDataTable()); // set result datatable
		searchPaging.ItemCollPosition = itemColl.ListItemCollectionPosition; // set position object
		searchPaging.FirstItem = itemColl[0]; // set first item of page
		searchPaging.LastItem = itemColl[itemColl.Count - 1]; // set last item of page
 
		return searchPaging;
	}
 
	protected void linkBtn_Search_Click(object sender, EventArgs e)
	{
		try
		{
			ViewState["Next"] = string.Empty;
			ViewState["Previous"] = string.Empty;
			ViewState["DataSortExpression"] = Constant.SearchResultColumnDocumentName;
			// get filters and store into Dictionary object
			// i store actual internal column value as key, so that i can use in my caml query
			Dictionary<string, string> searchFilters = GetSearchData();
			if (searchFilters.Count > 0)
			{
				BindListData(searchFilters, ViewState["Next"] as string, 1);
			}
		}
		catch(Exception ex)
		{
			// manage exception
		}
	}
 
	protected void LinkButtonPrevious_Click(object sender, EventArgs e)
	{
		Dictionary<string, string> searchFilters = GetSearchData();
		if (searchFilters.Count > 0)
			BindListData(searchFilters, ViewState["Previous"] as string, Convert.ToInt32(ViewState["CurrentPage"]) - 1);
	}
 
	protected void LinkButtonNext_Click(object sender, EventArgs e)
	{
		Dictionary<string, string> searchFilters = GetSearchData();
		if (searchFilters.Count > 0)
			BindListData(searchFilters, ViewState["Next"] as string, Convert.ToInt32(ViewState["CurrentPage"]) + 1);
	}       
 
}
 
public partial class SearchPaging
{
	public SPListItemCollectionPosition ItemCollPosition { get; set; }
	public SPListItem FirstItem { get; set; }
	public SPListItem LastItem { get; set; }
	private DataTable searchItems;
	public int SearchResultCount { get; set; }
	public DataTable SearchItems
	{
		get{return searchItems;}
	}
 
	public SearchPaging() { }
 
	public SearchPaging(DataTable SearchItems)
	{
		searchItems = SearchItems;
	}
}

    Summary

    In this i felt all things are simple. Only Paging info, list item position, first item and last item need to set properly.

    Hope this helps.
    Thanks!
    Avinash

    resource:http://sharepoint.infoyen.com/2012/03/06/sharepoint-list-pagination-using-splistitemcollectionposition/
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  • 原文地址：https://www.cnblogs.com/ilawrence/p/2775979.html
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