DevExpress中实现GridControl的分页功能

Posted 2021-11-27 mq0036

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

1.  
   //页行数
2.  
   public int pagesize = 20;
3.  
   //当前页
4.  
   public int pageIndex = 1;
5.  
   //总页数
6.  
   public int pageCount;

2.定义方法

1.  
   /// <summary>
2.  
   /// 绑定分页控件和GridControl数据
3.  
   /// </summary>
4.  
   /// <author>PengZhen</author>
5.  
   /// <time>2013-11-5 14:22:22</time>
6.  
   /// <param name="strWhere">查询条件</param>
7.  
   public void BindPageGridList(string strWhere)
8.  
   {
9.  
   SystemOperateLog objSOL = new BLL.SystemOperateLog();
10.  
     
11.  
    nvgtDataPager.Buttons.CustomButtons[0].Enabled = true;
12.  
    nvgtDataPager.Buttons.CustomButtons[1].Enabled = true;
13.  
    nvgtDataPager.Buttons.CustomButtons[2].Enabled = true;
14.  
    nvgtDataPager.Buttons.CustomButtons[3].Enabled = true;
15.  
    //记录获取开始数
16.  
    int startIndex = (pageIndex - 1) * pagesize + 1;
17.  
    //结束数
18.  
    int endIndex = pageIndex * pagesize;
19.  
     
20.  
    //总行数
21.  
    int row = objSOL.GetRecordCount(strWhere);
22.  
     
23.  
    //获取总页数
24.  
    if (row % pagesize > 0)
25.  
    {
26.  
    pageCount = row / pagesize + 1;
27.  
    }
28.  
    else
29.  
    {
30.  
    pageCount = row / pagesize;
31.  
    }
32.  
     
33.  
    if (pageIndex == 1)
34.  
    {
35.  
    nvgtDataPager.Buttons.CustomButtons[0].Enabled = false;
36.  
    nvgtDataPager.Buttons.CustomButtons[1].Enabled = false; ;
37.  
    }
38.  
     
39.  
    //最后页时获取真实记录数
40.  
    if (pageCount == pageIndex)
41.  
    {
42.  
    endIndex = row;
43.  
    nvgtDataPager.Buttons.CustomButtons[2].Enabled = false;
44.  
    nvgtDataPager.Buttons.CustomButtons[3].Enabled = false;
45.  
    }
46.  
     
47.  
    //分页获取数据列表
48.  
    DataTable dt = objSOL.GetListByPage(strWhere, "", startIndex, endIndex).Tables[0];
49.  
     
50.  
    gridLogList.DataSource = dt;
51.  
     
52.  
    nvgtDataPager.DataSource = dt;
53.  
    nvgtDataPager.TextStringFormat = string.Format("第 {0}页, 共 {1}页", pageIndex, pageCount);
54.  
    }

3.定义事件

1.  
   /// <summary>
2.  
   /// 按钮点击事件
3.  
   /// </summary>
4.  
   /// <author>PengZhen</author>
5.  
   /// <time>2013-11-5 14:24:25</time>
6.  
   /// <param name="sender"></param>
7.  
   /// <param name="e"></param>
8.  
   private void nvgtDataPager_ButtonClick(object sender, NavigatorButtonClickEventArgs e)
9.  
   {
10.  
    ShowEvent("ButtonClick", e.Button);
11.  
    }
12.  
     
13.  
    /// <summary>
14.  
    /// 分页事件处理
15.  
    /// </summary>
16.  
    /// <param name="eventString">事件名称</param>
17.  
    /// <param name="button">按钮控件</param>
18.  
    /// <author>PengZhen</author>
19.  
    /// <time>2013-11-5 14:25:59</time>
20.  
    void ShowEvent(string eventString, NavigatorButtonBase button)
21.  
    {
22.  
    //string type = button.ButtonType.ToString();
23.  
    NavigatorCustomButton btn = (NavigatorCustomButton)button;
24.  
    string type = btn.Tag.ToString();
25.  
    if (type == "首页")
26.  
    {
27.  
    pageIndex = 1;
28.  
    }
29.  
     
30.  
    if (type=="下一页")
31.  
    {
32.  
    pageIndex++;
33.  
    }
34.  
     
35.  
    if (type=="末页")
36.  
    {
37.  
    pageIndex = pageCount;
38.  
    }
39.  
     
40.  
    if (type == "上一页")
41.  
    {
42.  
    pageIndex--;
43.  
    }
44.  
     
45.  
    //绑定分页控件和GridControl数据
46.  
    BindPageGridList(strWhere);
47.  
    }

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三:数据库

1.  
   /// <summary>
2.  
   /// 获取记录总数
3.  
   /// </summary>
4.  
   public int GetRecordCount(string strWhere)
5.  
   {
6.  
   StringBuilder strSql = new StringBuilder();
7.  
   strSql.Append("select count(1) FROM TL_SYSTEM_OPERATE_LOGS ");
8.  
   if (strWhere.Trim() != "")
9.  
   {
10.  
    strSql.Append(" where " + strWhere);
11.  
    }
12.  
    object obj = _DbHelperOra.GetSingle(strSql.ToString());
13.  
    if (obj == null)
14.  
    {
15.  
    return 0;
16.  
    }
17.  
    else
18.  
    {
19.  
    return Convert.ToInt32(obj);
20.  
    }
21.  
    }
22.  
    /// <summary>
23.  
    /// 分页获取数据列表
24.  
    /// </summary>
25.  
    public DataSet GetListByPage(string strWhere, string orderby, int startIndex, int endIndex)
26.  
    {
27.  
    StringBuilder strSql = new StringBuilder();
28.  
    strSql.Append("SELECT * FROM ( ");
29.  
    strSql.Append(" SELECT ROW_NUMBER() OVER (");
30.  
    if (!string.IsNullOrEmpty(orderby.Trim()))
31.  
    {
32.  
    strSql.Append("order by T." + orderby);
33.  
    }
34.  
    else
35.  
    {
36.  
    strSql.Append("order by T.ID desc");
37.  
    }
38.  
    strSql.Append(")AS Rowssss, T.* from TL_SYSTEM_OPERATE_LOGS T ");
39.  
    if (!string.IsNullOrEmpty(strWhere.Trim()))
40.  
    {
41.  
    strSql.Append(" WHERE " + strWhere);
42.  
    }
43.  
    strSql.Append(" ) TT");
44.  
    strSql.AppendFormat(" WHERE TT.Rowssss between {0} and {1}", startIndex, endIndex);
45.  
    return _DbHelperOra.Query(strSql.ToString());
46.  
    }

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:

1.  
   //查询条件
2.  
   private static string strWhere = string.Empty;
3.  
    
4.  
   /// <summary>
5.  
   /// 查询
6.  
   /// </summary>
7.  
   /// <author>PengZhen</author>
8.  
   /// <time>2013-10-30 11:08:03</time>
9.  
   /// <param name="sender"></param>
10.  
    /// <param name="e"></param>
11.  
    private void btSelect_Click(object sender, EventArgs e)
12.  
    {
13.  
    //获取查询条件
14.  
    strWhere = GetSqlWhere();
15.  
     
16.  
    BindPageGridList(strWhere);
17.  
    }
18.  
     
19.  
    /// <summary>
20.  
    /// 获取查询条件
21.  
    /// </summary>
22.  
    /// <author>PengZhen</author>
23.  
    /// <time>2013-11-5 15:25:00</time>
24.  
    /// <returns>返回查询条件</returns>
25.  
    private string GetSqlWhere()
26.  
    {
27.  
    //查询条件
28.  
    string strReturnWhere = string.Empty;
29.  
     
30.  
    //用户编号
31.  
    string strUserId = string.Empty;
32.  
     
33.  
    if (!string.IsNullOrEmpty(UserManage.UserID))
34.  
    {
35.  
    strUserId = "12";// UserManage.UserID;
36.  
    }
37.  
    //分系统编码
38.  
    string strSubSystemCode = string.Empty;
39.  
     
40.  
    if (cbbSubSystemCode.SelectedItem != null)
41.  
    {
42.  
    strSubSystemCode = (cbbSubSystemCode.SelectedItem as ComboBoxData).Value;
43.  
    }
44.  
     
45.  
    //功能模块
46.  
    string strFunctionModule = string.Empty;
47.  
     
48.  
    if (cbbFunctionModule.SelectedItem != null)
49.  
    {
50.  
    strFunctionModule = (cbbFunctionModule.SelectedItem as ComboBoxData).Value;
51.  
    }
52.  
     
53.  
    //数据分类
54.  
    string strDataType = string.Empty;
55.  
     
56.  
    if (tcbDataType.SelectedNode != null)
57.  
    {
58.  
    strDataType = tcbDataType.SelectedNode.Name;
59.  
    }
60.  
     
61.  
    //操作类型
62.  
    string strOperatedType = string.Empty;
63.  
     
64.  
    if (cbbOperatedType.SelectedItem != null)
65.  
    {
66.  
    strOperatedType = (cbbOperatedType.SelectedItem as ComboBoxData).Value;
67.  
    }
68.  
    //开始时间
69.  
    string strStartTime = string.Empty;
70.  
     
71.  
    if (!string.IsNullOrEmpty(dateStartTime.Text))
72.  
    {
73.  
    strStartTime = dateStartTime.Text;
74.  
    }
75.  
    //结束时间
76.  
    string strEndTime = string.Empty;
77.  
     
78.  
    if (!string.IsNullOrEmpty(dateEndTime.Text))
79.  
    {
80.  
    strEndTime = dateEndTime.Text;
81.  
    }
82.  
     
83.  
    //用户ID
84.  
    if (!string.IsNullOrEmpty(strUserId))
85.  
    {
86.  
    strReturnWhere += "USER_ID=‘" + strUserId + "‘ and";
87.  
    }
88.  
    //分系统代码
89.  
    if (!string.IsNullOrEmpty(strSubSystemCode))
90.  
    {
91.  
    strReturnWhere += "SYSTEM_CODE=‘" + strSubSystemCode + "‘ and";
92.  
    }
93.  
    //模块编号
94.  
    if (!string.IsNullOrEmpty(strFunctionModule))
95.  
    {
96.  
    strReturnWhere += "MODULE_ID=‘" + strFunctionModule + "‘ and";
97.  
    }
98.  
    //数据分类代码
99.  
    if (!string.IsNullOrEmpty(strDataType))
100.  
     {
101.  
     strReturnWhere += "DATA_CATAGORY_CODE=‘" + strDataType + "‘ and";
102.  
     }
103.  
     //操作类型
104.  
     if (!string.IsNullOrEmpty(strOperatedType))
105.  
     {
106.  
     strReturnWhere += "OPERATE_TYPE=‘" + strOperatedType + "‘ and";
107.  
     }
108.  
     //操作时间
109.  
     if (!string.IsNullOrEmpty(strStartTime) && !string.IsNullOrEmpty(strEndTime))
110.  
     {
111.  
     strReturnWhere += "OPERATE_DATE between ‘" + strStartTime + "‘ and ‘" + strEndTime + "‘";
112.  
     }
113.  
      
114.  
     if (!string.IsNullOrEmpty(strReturnWhere))
115.  
     {
116.  
     strReturnWhere = strReturnWhere.Remove(strReturnWhere.LastIndexOf("and"));
117.  
     }
118.  
      
119.  
     return strReturnWhere;
120.  
     }

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