DataGridView分頁功能的實現
阿新 • • 發佈:2019-02-15
1 // 1、定義幾個所需的公有成員: 2 3 int pageSize =0; //每頁顯示行數 4 int nMax =0; //總記錄數 5 int pageCount =0; //頁數=總記錄數/每頁顯示行數 6 int pageCurrent =0; //當前頁號 7 int nCurrent =0; //當前記錄行 8 DataSet ds =new DataSet();
9 DataTable dtInfo =new DataTable();
10 11 //2、在窗體載入事件中,從資料來源讀取記錄到DataTable中: 12 13 string strConn ="SERVER=127.0.0.1;DATABASE=NORTHWIND;UID=SA;PWD=ULTRATEL"; //資料庫連線字串 14 SqlConnection conn =new SqlConnection(strConn);
15 conn.Open();
16 string strSql ="SELECT * FROM CUSTOMERS";
17 SqlDataAdapter sda =new SqlDataAdapter(strSql,conn);
18 sda.Fill(ds,"ds");
19 conn.Close();
20 dtInfo = ds.Tables[0];
21 InitDataSet();
22 23 //3、用當前頁面資料填充DataGridView 24 25 privatevoid InitDataSet()
26 {
27 pageSize =20; //設定頁面行數 28 nMax = dtInfo.Rows.Count;
29 pageCount=(nMax/pageSize); //計算出總頁數 30 if ((nMax % pageSize) >0) pageCount++;
31 pageCurrent =1; //當前頁數從1開始 32 nCurrent =0; //當前記錄數從0開始 33 LoadData();
34 }
35 36 privatevoid LoadData()
37 {
38 int nStartPos =0; //當前頁面開始記錄行 39 int nEndPos =0; //當前頁面結束記錄行 40 DataTable dtTemp = dtInfo.Clone(); //克隆DataTable結構框架 41 42 if (pageCurrent == pageCount)
43 {
44 nEndPos = nMax;
45 }
46 else 47 {
48 nEndPos = pageSize * pageCurrent;
49 }
50 51 nStartPos = nCurrent;
52 lblPageCount.Text = pageCount.ToString();
53 txtCurrentPage.Text = Convert.ToString(pageCurrent);
54 55 56 //從元資料來源複製記錄行 57 for (int i = nStartPos; i < nEndPos; i++)
58 {
59 dtTemp.ImportRow(dtInfo.Rows[i]);
60 nCurrent++;
61 }
62 bdsInfo.DataSource = dtTemp;
63 bdnInfo.BindingSource = bdsInfo;
64 dgvInfo.DataSource = bdsInfo;
65 }
66 67 // 4、選單響應事件: 68 69 privatevoid bdnInfo_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
70 {
71 if (e.ClickedItem.Text =="關閉")
72 {
73 this.Close();
74 }
75 if (e.ClickedItem.Text =="上一頁")
76 {
77 pageCurrent--;
78 if (pageCurrent <=0)
79 {
80 MessageBox.Show("已經是第一頁,請點選“下一頁”檢視!");
81 return;
82 }
83 else 84 {
85 nCurrent = pageSize * (pageCurrent -1);
86 }
87 LoadData();
88 }
89 if (e.ClickedItem.Text =="下一頁")
90 {
91 pageCurrent++;
92 if (pageCurrent > pageCount)
93 {
94 MessageBox.Show("已經是最後一頁,請點選“上一頁”檢視!");
95 return;
96 }
97 else 98 {
99 nCurrent=pageSize*(pageCurrent-1);
100 }
101 LoadData();
102 }
103 }
9 DataTable dtInfo =new DataTable();
10 11 //2、在窗體載入事件中,從資料來源讀取記錄到DataTable中: 12 13
15 conn.Open();
16 string strSql ="SELECT * FROM CUSTOMERS";
17 SqlDataAdapter sda =new SqlDataAdapter(strSql,conn);
18 sda.Fill(ds,"ds");
19
20 dtInfo = ds.Tables[0];
21 InitDataSet();
22 23 //3、用當前頁面資料填充DataGridView 24 25 privatevoid InitDataSet()
26 {
27 pageSize =20; //設定頁面行數 28 nMax = dtInfo.Rows.Count;
29 pageCount=(nMax/pageSize); //計算出總頁數 30 if ((nMax % pageSize)
31 pageCurrent =1; //當前頁數從1開始 32 nCurrent =0; //當前記錄數從0開始 33 LoadData();
34 }
35 36 privatevoid LoadData()
37 {
38 int nStartPos =0; //當前頁面開始記錄行 39 int nEndPos =0; //當前頁面結束記錄行 40 DataTable dtTemp = dtInfo.Clone(); //克隆DataTable結構框架 41 42 if (pageCurrent == pageCount)
43 {
44 nEndPos = nMax;
45 }
46 else 47 {
48 nEndPos = pageSize * pageCurrent;
49 }
50 51 nStartPos = nCurrent;
52 lblPageCount.Text = pageCount.ToString();
53 txtCurrentPage.Text = Convert.ToString(pageCurrent);
54 55 56 //從元資料來源複製記錄行 57 for (int i = nStartPos; i < nEndPos; i++)
58 {
59 dtTemp.ImportRow(dtInfo.Rows[i]);
60 nCurrent++;
61 }
62 bdsInfo.DataSource = dtTemp;
63 bdnInfo.BindingSource = bdsInfo;
64 dgvInfo.DataSource = bdsInfo;
65 }
66 67 // 4、選單響應事件: 68 69 privatevoid bdnInfo_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
70 {
71 if (e.ClickedItem.Text =="關閉")
72 {
73 this.Close();
74 }
75 if (e.ClickedItem.Text =="上一頁")
76 {
77 pageCurrent--;
78 if (pageCurrent <=0)
79 {
80 MessageBox.Show("已經是第一頁,請點選“下一頁”檢視!");
81 return;
82 }
83 else 84 {
85 nCurrent = pageSize * (pageCurrent -1);
86 }
87 LoadData();
88 }
89 if (e.ClickedItem.Text =="下一頁")
90 {
91 pageCurrent++;
92 if (pageCurrent > pageCount)
93 {
94 MessageBox.Show("已經是最後一頁,請點選“上一頁”檢視!");
95 return;
96 }
97 else 98 {
99 nCurrent=pageSize*(pageCurrent-1);
100 }
101 LoadData();
102 }
103 }