How to implement program paging in .NET

aspx

查询

 

<%#rptList.Items.Count == 0 ? "暂无记录" : ""%>

显示 OnTextChanged="txtPageNum_TextChanged" AutoPostBack="True">条/页

CodeBehind

Namespace

public partial class xxx : Web.UI.ManagePage
{

protected int totalCount;//Total number of records
protected int page;//Current page
protected int pageSize;//Data size per page
protected string keywords = string.Empty;//Query conditions

protected void Page_Load(object sender, EventArgs e)
　　{

##　　 this.keywords = Utils. .GetQueryString("keywords");//Get query conditions            this.pageSize = GetPageSize(10); //Set the data size of each page

               if (!Page.IsPostBack)                                                                                                                                                                                                                                                                            );

##　　 }

　　 }

private void RptBind(string _strWhere, string _orderby)                                                                                                                                                                                                       ;                                                                                                                                                                    # This.rptList.DataBind(); lblTotalIncome.Text = Math.Round(totalIncome, 3).ToString(); txtPageNum.Text = this.pageSize.ToString();

string pageU rl=

Utils.CombUrlTxt("xxx.aspx", "keywords={0}&page={1}", this.keywords, "__id__");             PageContent.InnerHtml =
Utils.
OutPageList(this.pageSize, this.page, this.totalCount, pageUrl, 8);
    }




##private int GetPageSize(int _default_size )
                                                                int _pagesize; if (_pagesize > 0)                                                                                                                                                                        }

protected void lbtnSearch_Click(object sender, EventArgs e)
        {
            Response.Redirect(Utils.CombUrlTxt("xxx.aspx", "keywords={0}", txtKeywords.Text));
        }

protected void txtPageNum_TextChanged(object sender, EventArgs e)
        {
            int _pagesize;
            if (int.TryParse(txtPageNum.Text.Trim(), out _pagesize))
            {
                if (_pagesize > 0)
                {
                    Utils.WriteCookie("detail_page_size", "NovelPage", _pagesize.ToString(), 14400);
                }
            }
            Response.Redirect(Utils.CombUrlTxt("xxx.aspx", "keywords={0}", this.keywords));
        }

}

Utils

命名空间

public class Utils
{

public static string GetQueryString(string strName)
        {
            return GetQueryString(strName, false);
        }

public static string GetQueryString(string strName, bool sqlSafeCheck)
        {
            if (HttpContext.Current.Request.QueryString[strName] == null)
                return "";

            if (sqlSafeCheck && !IsSafeSqlString(HttpContext.Current.Request.QueryString[strName]))
                return "unsafe string";

            return HttpContext.Current.Request.QueryString[strName];
        }

public static bool IsSafeSqlString(string str)
        {
            return !Regex.IsMatch(str, @"[-|;|,|\/|\(|\)|\[|\]|\}|\{|%|@|\*|!|\']");
        }

public static int GetQueryInt(string strName, int defValue)
        {
            return StrToInt(HttpContext.Current.Request.QueryString[strName], defValue);
        }

public static int StrToInt(string expression, int defValue)
        {
            if (string.IsNullOrEmpty(expression) || expression.Trim().Length >= 11 || !Regex.IsMatch(expression.Trim(), @"^([-]|[0-9])[0-9]*(\.\w*)?$"))
                return defValue;

            int rv;
            if (Int32.TryParse(expression, out rv))
                return rv;

            return Convert.ToInt32(StrToFloat(expression, defValue));
        }

public static float StrToFloat(string expression, float defValue)
        {
            if ((expression == null) || (expression.Length > 10))
                return defValue;

            float intValue = defValue;
            if (expression != null)
            {
                bool IsFloat = Regex.IsMatch(expression, @"^([-]|[0-9])[0-9]*(\.\w*)?$");
                if (IsFloat)
                    float.TryParse(expression, out intValue);
            }
            return intValue;
        }

public static string CombUrlTxt(string _url, string _keys, params string[] _values)
        {
            StringBuilder urlParams = new StringBuilder();
            try
            {
                string[] keyArr = _keys.Split(new char[] { '&' });
                for (int i = 0; i < keyArr.Length; i++)
                {
                    if (!string.IsNullOrEmpty(_values[i]) && _values[i] != "0")
                    {
                        _values[i] = UrlEncode(_values[i]);
                        urlParams.Append(string.Format(keyArr[i], _values) + "&");
                    }
                }
                if (!string.IsNullOrEmpty(urlParams.ToString()) && _url.IndexOf("?") == -1)
                    urlParams.Insert(0, "?");
            }
            catch
            {
                return _url;
            }
            return _url + DelLastChar(urlParams.ToString(), "&");
        }

public static string UrlEncode(string str)
        {
            if (string.IsNullOrEmpty(str))
            {
                return "";
            }
            str = str.Replace("'", "");
            return HttpContext.Current.Server.UrlEncode(str);
        }

//删除最后结尾的指定字符后的字符

public static string DelLastChar(string str, string strchar)
        {
            if (string.IsNullOrEmpty(str))
                return "";
            if (str.LastIndexOf(strchar) >= 0 && str.LastIndexOf(strchar) == str.Length - 1)
            {
                return str.Substring(0, str.LastIndexOf(strchar));
            }
            return str;
        }

//返回分页页码

public static string OutPageList(int pageSize, int pageIndex, int totalCount, string linkUrl, int centSize)
        {
            //计算页数
            if (totalCount < 1 || pageSize < 1)
            {
                return "";
            }
            int pageCount = totalCount / pageSize;
            if (pageCount < 1)
            {
                return "";
            }
            if (totalCount % pageSize > 0)
            {
                pageCount += 1;
            }
            if (pageCount <= 1)
            {
                return "";
            }
            StringBuilder pageStr = new StringBuilder();
            string pageId = "__id__";
            string firstBtn = "上一页»";
            string lastBtn = "下一页»";
            string firstStr = "1";
            string lastStr = "" + pageCount.ToString() + "";

            if (pageIndex <= 1)
            {
                firstBtn = "«上一页";
            }
            if (pageIndex >= pageCount)
            {
                lastBtn = "下一页»";
            }
            if (pageIndex == 1)
            {
                firstStr = "1";
            }
            if (pageIndex == pageCount)
            {
                lastStr = "" + pageCount.ToString() + "";
            }
int firstNum = pageIndex - (centSize / 2); //The page number starting in the middle
if (pageIndex < centSize)
firstNum = 2;
int lastNum = pageIndex + centSize - ((centSize / 2) + 1); //The page number at the end of the middle
            if (lastNum >= pageCount) 
               lastNum = pageCount - 1; ;/span>");
pageStr.Append(firstBtn + firstStr);
if (pageIndex >= centSize)
{
pageStr.Append("...< ) {
             pageStr.Append("" + i + "");
                                                                                                                                        pageStr.Append ("" + i + "");
if (PageCount -PageIndex & GT; CentSize- (CentSize / 2))
{
PageStr.appnd ("& LT; span & gt; ... & lt; / span & gt;");
}
               pageStr.Append(lastStr + lastBtn);
                                                                  out out out‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ } } string newStr)
                                                                                                                                                                                                 , newStr);
}

public static string GetCookie(string strName, string key)
        {
            if (HttpContext.Current.Request.Cookies != null && HttpContext.Current.Request.Cookies[strName] != null && HttpContext.Current.Request.Cookies[strName][key] != null)
                return UrlDecode(HttpContext.Current.Request.Cookies[strName][key].ToString());

            return "";
        }

public static string UrlDecode(string str)
        {
            if (string.IsNullOrEmpty(str))
            {
                return "";
            }
            return HttpContext.Current.Server.UrlDecode(str);
        }

public static void WriteCookie(string strName, string key, string strValue, int expires)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[strName];
            if (cookie == null)
            {
                cookie = new HttpCookie(strName);
            }
            cookie[key] = UrlEncode(strValue);
            cookie.Expires = DateTime.Now.AddMinutes(expires);
            HttpContext.Current.Response.AppendCookie(cookie);
        }

}

 

Bussiness

命名空间

 public class Business
    {
        private readonly DAL.xxx xxxDal;

public Business()
        {
            xxxDal = new DAL.xxx();

　　}

public List GetList(int pageSize, int pageIndex, string strWhere, string filedOrder, out int recordCount,out decimal totalIncome)
        {
            return xxxDal.GetList(pageSize, pageIndex, strWhere, filedOrder, out recordCount,out totalIncome);
        }

}

 

DAL

命名空间

public partial class xxx
{

public List GetList(int pageSize, int pageIndex, string strWhere, string filedOrder, out int recordCount,out decimal totalIncome)
        {
            totalIncome = 0;
            StringBuilder strSql = new StringBuilder();
            strSql.Append(@"select a.oid,ocreatetime,a.oaccname,a.oacctel,(select ucardnum from AppUser where uid=a.ouid) as ucardnum,c.pname,
                            otype,ISNULL(b.corealmoney,0) as corealmoney,ISNULL(b.cooid,0) as cooid,
                            omoney,ISNULL(coprate,0) coprate,ISNULL(codrawfee,0) codrawfee,ISNULL(codowndrawfee,0) codowndrawfee,ISNULL(d.uname,'无') as uname,
                             ISNULL(b.couserrate,0) as couserrate,
                            ROW_NUMBER() over(order by ocreatetime desc) r from xxx a left join
                            (select cooid,coprate,comoney,corealmoney,codowndrawfee,codrawfee,couupperid,couserrate from xxx where costatus=1)b
                            on a.oid=b.cooid join xxx c on a.opid=c.pid
                            left join xxx d on b.couupperid=d.[uid] where a.ostatus=1 ");
            if (strWhere.Trim() != "")
            {
                strSql.Append(strWhere);
            }
            using (var context = DataBaseConnection.GetSdkBaseConnection())
            {
                recordCount = context.ExecuteScalar(PagingHelper.CreateCountingSql(strSql.ToString()));
                if (recordCount > 0)
                {
                    StringBuilder strSql2 = new StringBuilder();
                    strSql2.Append(@"select SUM(corealmoney) from xxx a left join
                                    (select cooid,coprate,corealmoney,codowndrawfee,comoney,codrawfee,couupperid,couserrate from xxx where costatus=1)b
                                    on a.oid=b.cooid join xxx c on a.opid=c.pid
                                    left join xxx d on b.couupperid=d.[uid] where a.ostatus=1 ");
                    if (strWhere.Trim() != "")
                    {
strSql2.Append(strWhere);
                                                                                                                                                                                           strSql2. ToString(), filedOrder)).ToList( ;



// ROW_NUMBER high-efficiency paging (only supports MSSQL2005 and above)

public static class PagingHelper {

// Get the paging SQL statement. The default row_number is the key word. This field name is not allowed in all tables.

public static string CreatePagingSql(int _recordCount, int _pageSize, int _pageIndex, string _safeSql, string _orderField)

                                                                                                                                                                                                                                   Count + _pageSize - 1 ) / _pageSize;

//Check the current page number if (_pageIndex < 1)

       else if (_pageIndex > pageCount)

                                                                                                                                         pageCount) ); newSafeSql.AppendFormat ("SELECT ROW_NUMBER() OVER(ORDER BY {0}) as row_number,", _orderField);
        newSafeSql.Append(_safeSql.Substring(_safeSql.ToUpper().IndexOf("SELECT") + 6));

                                                                                              # ToString ());

sbSql.Append(") AS T"); sbSql.AppendFormat(" WHERE row_number between {0} and {1}", ((_pageIndex - 1) * _pageSize) + 1, _pageIndex * _pageSize);

Return sbSql.ToString();

} // Get the total number of records SQL statement
public static string CreateCountingSql(string _safeSql)
{
return string.Format(" SELECT COUNT(1) AS RecordCount FROM ({0}) AS T ", _safeSql);
    }



}

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