我们如何在winform的datagridview中做分页

我想在窗体的datagridview中显示每页10条logging，用户必须点击下一个button来显示下面的10条logging。 在DataGridview中是否有一些属性，或者是否需要创build一个自定义控件？

我需要做什么来实现这一点。

Answer 1

下面是一个简单的工作示例，其中BindingNavigator GUI控件通过将其DataSource设置为IListSource的自定义子类来使用BindingSource对象来标识分页符。 （感谢这个答案的关键想法。）当用户点击“下一页”button时，BindingNavigator触发bindingSource1_CurrentChanged并且您的代码可以获取所需的logging。 说明：

1. 创build一个Windows窗体应用程序
2. 拖到表单上一个BindingNavigator，一个DataGridView和一个BindingSource
3. 用下面的代码replaceForm1.cs：

 using System; using System.Collections.Generic; using System.Windows.Forms; namespace PagedDataGridView { public partial class Form1 : Form { private const int totalRecords = 43; private const int pageSize = 10; public Form1() { InitializeComponent(); dataGridView1.Columns.Add(new DataGridViewTextBoxColumn { DataPropertyName = "Index" }); bindingNavigator1.BindingSource = bindingSource1; bindingSource1.CurrentChanged += new System.EventHandler(bindingSource1_CurrentChanged); bindingSource1.DataSource = new PageOffsetList(); } private void bindingSource1_CurrentChanged(object sender, EventArgs e) { // The desired page has changed, so fetch the page of records using the "Current" offset int offset = (int)bindingSource1.Current; var records = new List<Record>(); for (int i = offset; i < offset + pageSize && i < totalRecords; i++) records.Add(new Record { Index = i }); dataGridView1.DataSource = records; } class Record { public int Index { get; set; } } class PageOffsetList : System.ComponentModel.IListSource { public bool ContainsListCollection { get; protected set; } public System.Collections.IList GetList() { // Return a list of page offsets based on "totalRecords" and "pageSize" var pageOffsets = new List<int>(); for (int offset = 0; offset < totalRecords; offset += pageSize) pageOffsets.Add(offset); return pageOffsets; } } } } 

Answer 2

这是我的解决scheme：我花了近一年时间才find它，并为此感到自豪

 public class SuperGrid : DataGridView { public int PageSize { get { return _pageSize; } set { _pageSize = value; } } public int _pageSize = 10; BindingSource bs = new BindingSource(); BindingList<DataTable> tables = new BindingList<DataTable>(); public void SetPagedDataSource(DataTable dataTable, BindingNavigator bnav) { DataTable dt = null; int counter = 1; foreach (DataRow dr in dataTable.Rows) { if (counter == 1) { dt = dataTable.Clone(); tables.Add(dt); } dt.Rows.Add(dr.ItemArray); if (PageSize < ++counter ) { counter = 1; } } bnav.BindingSource = bs; bs.DataSource = tables; bs.PositionChanged += bs_PositionChanged; bs_PositionChanged(bs, EventArgs.Empty); } void bs_PositionChanged(object sender, EventArgs e) { this.DataSource = tables[bs.Position]; } } 

如何使用它？ 将上面的代码添加到您的项目中，将Supergrid和一个bindingnavigator控件拖到您的胜利表单。

  superGrid1.PageSize = 5; DataTable dt = DataProvider.ExecuteDt("select * from test order by col"); superGrid1.SetPagedDataSource(dt, bindingNavigator1); 

你得到一个分页Datagridview与数据绑定没有太多的ha /

Answer 3

解决此问题的另一种方法：

 public class PagedGrid : DataGridView { Paging pg; SQLQuery s; public void SetPagedDataSource( SQLQuery s, BindingNavigator bnav) { this.s = s; int count = DataProvider.ExecuteCount(s.CountQuery); pg = new Paging(count, 5); bnav.BindingSource = pg.BindingSource; pg.BindingSource.PositionChanged += new EventHandler(bs_PositionChanged); //first page string q = s.GetPagingQuery(pg.GetStartRowNum(1), pg.GetEndRowNum(1), true); DataTable dt = DataProvider.ExecuteDt(q); DataSource = dt; } void bs_PositionChanged(object sender, EventArgs e) { int pos = ((BindingSource)sender).Position + 1; string q = s.GetPagingQuery(pg.GetStartRowNum(pos), pg.GetEndRowNum(pos), false); DataTable dt = DataProvider.ExecuteDt(q); DataSource = dt; } public void UpdateData() { DataTable dt = (DataTable)DataSource; using (SqlConnection con = new SqlConnection(DataProvider.conStr)) { con.Open(); SqlDataAdapter da = new SqlDataAdapter(s.CompleteQuery, con); SqlCommandBuilder cb = new SqlCommandBuilder(da); da.UpdateCommand = cb.GetUpdateCommand(); da.InsertCommand = cb.GetInsertCommand(); da.DeleteCommand = cb.GetDeleteCommand(); da.Update(dt); } MessageBox.Show("The changes are committed to database!"); } } /// <summary> /// Gives functionality of next page , etc for paging. /// </summary> public class Paging { public int _totalSize = 0; private int _pageSize = 0; public int TotalSize { get { return _totalSize; } set { if (value <= 0) { throw new ArgumentException(); } _totalSize = value; } } public int PageSize { get { return _pageSize; } set { if (value <= 0) { throw new ArgumentException(); } _pageSize = value; } } public Paging(int totalSize, int pageSize) { this.TotalSize = totalSize; this.PageSize = pageSize; } public int GetStartRowNum(int PageNum) { if (PageNum < 1) { throw new Exception("Page number starts at 1"); } if (PageNum > GetPageCount()) { throw new Exception("Page number starts at " + GetPageCount().ToString()); } return 1 + ((PageNum - 1) * _pageSize); } public int GetEndRowNum(int PageNum) { if (PageNum < 1) { throw new Exception("Page number starts at 1"); } if (PageNum > GetPageCount()) { throw new Exception("Page number starts at " + GetPageCount().ToString()); } return _pageSize + ((PageNum - 1) * _pageSize); } public int GetPageCount() { return (int)Math.Ceiling(TotalSize / (decimal)PageSize); } public bool IsFirstPage(int PageNum) { if (PageNum == 1) { return true; } return false; } public bool IsLastPage(int PageNum) { if (PageNum == GetPageCount()) { return true; } return false; } private int _currentPage = 1; public int CurrentPage { get { return _currentPage; } set { _currentPage = value; } } public int NextPage { get { if (CurrentPage + 1 <= GetPageCount()) { _currentPage = _currentPage + 1; } return _currentPage; } } public int PreviousPage { get { if (_currentPage - 1 >= 1) { _currentPage = _currentPage - 1; } return _currentPage; } } private BindingSource _bindingSource = null; public BindingSource BindingSource { get { if (_bindingSource == null) { _bindingSource = new BindingSource(); List<int> test = new List<int>(); for (int i = 0; i < GetPageCount(); i++) { test.Add(i); } _bindingSource.DataSource = test; } return _bindingSource; } } } /// <summary> /// Query Helper of Paging /// </summary> public class SQLQuery { private string IDColumn = ""; private string WherePart = " 1=1 "; private string FromPart = ""; private string SelectPart = ""; public SQLQuery(string SelectPart, string FromPart, string WherePart, string IDColumn) { this.IDColumn = IDColumn; this.WherePart = WherePart; this.FromPart = FromPart; this.SelectPart = SelectPart; } public string CompleteQuery { get { if (WherePart.Trim().Length > 0) { return string.Format("Select {0} from {1} where {2} ", SelectPart, FromPart, WherePart); } else { return string.Format("Select {0} from {1} ", SelectPart, FromPart); } } } public string CountQuery { get { if (WherePart.Trim().Length > 0) { return string.Format("Select count(*) from {0} where {1} ", FromPart, WherePart); } else { return string.Format("Select count(*) from {0} ", FromPart); } } } public string GetPagingQuery(int fromrow, int torow, bool isSerial) { fromrow--; if (isSerial) { return string.Format("{0} where {1} >= {2} and {1} <= {3}", CompleteQuery, IDColumn, fromrow, torow); } else { string select1 = ""; string select2 = ""; if (WherePart.Trim().Length > 0) { select1 = string.Format("Select top {3} {0} from {1} where {2} ", SelectPart, FromPart, WherePart, torow.ToString()); select2 = string.Format("Select top {3} {0} from {1} where {2} ", SelectPart, FromPart, WherePart, fromrow.ToString()); } else { select1 = string.Format("Select top {2} {0} from {1} ", SelectPart, FromPart, torow.ToString()); select2 = string.Format("Select top {2} {0} from {1} ", SelectPart, FromPart, fromrow.ToString()); } if (fromrow <= 1) { return select1; } else { return string.Format("{0} except {1} ", select1, select2); } } } } 

使用它：

  private void Form1_Load(object sender, EventArgs e) { SQLQuery s = new SQLQuery("*", "table", "", "id"); pagedGrid1.SetPagedDataSource(s, bindingNavigator1); } 

注意：DataPrivier类不包含在这里，它是一个简单的类，它返回任何来源的数据表。

Answer 4

试试这个，这个代码是针对OleDb的，但也适用于SqlServer连接。 dt（DataTable）对象用选定的页面行填充，假定页面以1开头（不是0）

 public DataTable getData(string sql, int pgNo, int totalRows) { DataTable dt = null; using (OleDbConnection conn = new OleDbConnection(connStr)) { try { DataSet ds; conn.Open(); ds = new DataSet(); OleDbDataAdapter adapter = new OleDbDataAdapter(sql, conn); adapter.Fill(ds, (pgNo-1)*totalRows, totalRows, "Table"); conn.Close(); dt = ds.Tables[0]; } catch (Exception ex) {if (conn != null) conn.Dispose();} return dt; }