DevExpress中如何实现GridControl的分页功能
简介:DevExpress中如何实现GridControl的分页功能,
主要是利用DataNavigator和GridControl组合,自定义事件实现分页功能
接下来,我们就去实现分页功能,先看下效果图:
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整个分页操作,基本分三步:
一:界面层
二:代码层
三:数据库
四:调用
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一:界面层,如图:
说明:放入一个GridControl控件(gridLogList)和DataNavigator控件(nvgtDataPager),给GridControl绑定好列,
设置DataNavigator控件属性Dock=Bottom;TextLocation=Center;TextStringFormat=第 {0}页 ,共 {1};
ShowToolTips=true;将下图中圈中的按钮属性visible=False;
如图:
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二:代码层
1.定义变量
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//页行数
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public int pagesize = 20;
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//当前页
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public int pageIndex = 1;
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//总页数
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public int pageCount;
2.定义方法
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/// <summary>
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/// 绑定分页控件和GridControl数据
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/// </summary>
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/// <author>PengZhen</author>
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/// <time>2013-11-5 14:22:22</time>
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/// <param name="strWhere">查询条件</param>
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public void BindPageGridList(string strWhere)
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{
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SystemOperateLog objSOL = new BLL.SystemOperateLog();
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nvgtDataPager.Buttons.CustomButtons[0].Enabled = true;
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nvgtDataPager.Buttons.CustomButtons[1].Enabled = true;
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nvgtDataPager.Buttons.CustomButtons[2].Enabled = true;
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nvgtDataPager.Buttons.CustomButtons[3].Enabled = true;
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//记录获取开始数
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int startIndex = (pageIndex - 1) * pagesize + 1;
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//结束数
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int endIndex = pageIndex * pagesize;
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//总行数
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int row = objSOL.GetRecordCount(strWhere);
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//获取总页数
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if (row % pagesize > 0)
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{
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pageCount = row / pagesize + 1;
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}
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else
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{
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pageCount = row / pagesize;
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}
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if (pageIndex == 1)
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{
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nvgtDataPager.Buttons.CustomButtons[0].Enabled = false;
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nvgtDataPager.Buttons.CustomButtons[1].Enabled = false; ;
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}
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//最后页时获取真实记录数
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if (pageCount == pageIndex)
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{
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endIndex = row;
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nvgtDataPager.Buttons.CustomButtons[2].Enabled = false;
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nvgtDataPager.Buttons.CustomButtons[3].Enabled = false;
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}
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//分页获取数据列表
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DataTable dt = objSOL.GetListByPage(strWhere, "", startIndex, endIndex).Tables[0];
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gridLogList.DataSource = dt;
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nvgtDataPager.DataSource = dt;
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nvgtDataPager.TextStringFormat = string.Format("第 {0}页, 共 {1}页", pageIndex, pageCount);
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}
3.定义事件
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/// <summary>
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/// 按钮点击事件
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/// </summary>
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/// <author>PengZhen</author>
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/// <time>2013-11-5 14:24:25</time>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void nvgtDataPager_ButtonClick(object sender, NavigatorButtonClickEventArgs e)
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{
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ShowEvent("ButtonClick", e.Button);
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}
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/// <summary>
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/// 分页事件处理
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/// </summary>
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/// <param name="eventString">事件名称</param>
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/// <param name="button">按钮控件</param>
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/// <author>PengZhen</author>
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/// <time>2013-11-5 14:25:59</time>
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void ShowEvent(string eventString, NavigatorButtonBase button)
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{
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//string type = button.ButtonType.ToString();
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NavigatorCustomButton btn = (NavigatorCustomButton)button;
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string type = btn.Tag.ToString();
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if (type == "首页")
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{
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pageIndex = 1;
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}
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if (type=="下一页")
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{
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pageIndex++;
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}
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if (type=="末页")
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{
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pageIndex = pageCount;
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}
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if (type == "上一页")
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{
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pageIndex--;
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}
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//绑定分页控件和GridControl数据
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BindPageGridList(strWhere);
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}
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三:数据库
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/// <summary>
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/// 获取记录总数
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/// </summary>
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public int GetRecordCount(string strWhere)
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{
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StringBuilder strSql = new StringBuilder();
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strSql.Append("select count(1) FROM TL_SYSTEM_OPERATE_LOGS ");
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if (strWhere.Trim() != "")
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{
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strSql.Append(" where " + strWhere);
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}
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object obj = _DbHelperOra.GetSingle(strSql.ToString());
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if (obj == null)
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{
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return 0;
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}
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else
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{
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return Convert.ToInt32(obj);
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}
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}
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/// <summary>
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/// 分页获取数据列表
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/// </summary>
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public DataSet GetListByPage(string strWhere, string orderby, int startIndex, int endIndex)
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{
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StringBuilder strSql = new StringBuilder();
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strSql.Append("SELECT * FROM ( ");
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strSql.Append(" SELECT ROW_NUMBER() OVER (");
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if (!string.IsNullOrEmpty(orderby.Trim()))
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{
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strSql.Append("order by T." + orderby);
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}
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else
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{
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strSql.Append("order by T.ID desc");
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}
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strSql.Append(")AS Rowssss, T.* from TL_SYSTEM_OPERATE_LOGS T ");
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if (!string.IsNullOrEmpty(strWhere.Trim()))
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{
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strSql.Append(" WHERE " + strWhere);
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}
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strSql.Append(" ) TT");
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strSql.AppendFormat(" WHERE TT.Rowssss between {0} and {1}", startIndex, endIndex);
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return _DbHelperOra.Query(strSql.ToString());
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}
说明:数据库的操作只作为借鉴,请根据自己的表做相应的修改
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四:调用
如文章开头第一张效果图所述,当我就行查询操作时,也就是调用分页和绑定数据,需要做的操作,如下:
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//查询条件
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private static string strWhere = string.Empty;
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/// <summary>
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/// 查询
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/// </summary>
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/// <author>PengZhen</author>
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/// <time>2013-10-30 11:08:03</time>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void btSelect_Click(object sender, EventArgs e)
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{
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//获取查询条件
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strWhere = GetSqlWhere();
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BindPageGridList(strWhere);
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}
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/// <summary>
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/// 获取查询条件
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/// </summary>
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/// <author>PengZhen</author>
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/// <time>2013-11-5 15:25:00</time>
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/// <returns>返回查询条件</returns>
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private string GetSqlWhere()
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{
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//查询条件
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string strReturnWhere = string.Empty;
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//用户编号
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string strUserId = string.Empty;
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if (!string.IsNullOrEmpty(UserManage.UserID))
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{
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strUserId = "12";// UserManage.UserID;
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}
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//分系统编码
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string strSubSystemCode = string.Empty;
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if (cbbSubSystemCode.SelectedItem != null)
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{
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strSubSystemCode = (cbbSubSystemCode.SelectedItem as ComboBoxData).Value;
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}
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//功能模块
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string strFunctionModule = string.Empty;
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if (cbbFunctionModule.SelectedItem != null)
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{
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strFunctionModule = (cbbFunctionModule.SelectedItem as ComboBoxData).Value;
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}
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//数据分类
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string strDataType = string.Empty;
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if (tcbDataType.SelectedNode != null)
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{
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strDataType = tcbDataType.SelectedNode.Name;
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}
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//操作类型
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string strOperatedType = string.Empty;
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if (cbbOperatedType.SelectedItem != null)
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{
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strOperatedType = (cbbOperatedType.SelectedItem as ComboBoxData).Value;
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}
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//开始时间
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string strStartTime = string.Empty;
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if (!string.IsNullOrEmpty(dateStartTime.Text))
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{
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strStartTime = dateStartTime.Text;
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}
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//结束时间
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string strEndTime = string.Empty;
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if (!string.IsNullOrEmpty(dateEndTime.Text))
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{
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strEndTime = dateEndTime.Text;
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}
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//用户ID
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if (!string.IsNullOrEmpty(strUserId))
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{
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strReturnWhere += "USER_ID=‘" + strUserId + "‘ and";
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}
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//分系统代码
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if (!string.IsNullOrEmpty(strSubSystemCode))
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{
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strReturnWhere += "SYSTEM_CODE=‘" + strSubSystemCode + "‘ and";
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}
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//模块编号
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if (!string.IsNullOrEmpty(strFunctionModule))
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{
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strReturnWhere += "MODULE_ID=‘" + strFunctionModule + "‘ and";
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}
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//数据分类代码
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if (!string.IsNullOrEmpty(strDataType))
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{
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strReturnWhere += "DATA_CATAGORY_CODE=‘" + strDataType + "‘ and";
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}
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//操作类型
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if (!string.IsNullOrEmpty(strOperatedType))
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{
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strReturnWhere += "OPERATE_TYPE=‘" + strOperatedType + "‘ and";
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}
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//操作时间
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if (!string.IsNullOrEmpty(strStartTime) && !string.IsNullOrEmpty(strEndTime))
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{
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strReturnWhere += "OPERATE_DATE between ‘" + strStartTime + "‘ and ‘" + strEndTime + "‘";
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}
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if (!string.IsNullOrEmpty(strReturnWhere))
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{
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strReturnWhere = strReturnWhere.Remove(strReturnWhere.LastIndexOf("and"));
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}
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return strReturnWhere;
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}
说明:此处只需要指定你自定义的条件就可以了,以上代码展示的只是文章图一的实现
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好了,到这,我们的所有操作就完成了,来看下我们运行的分页效果图:
DevExpress中如何实现GridControl的分页功能(组件)
出处： https://blog.csdn.net/pengzhen8805/article/details/14169327
原文地址：https://www.cnblogs.com/mq0036/p/10813957.html