13
我想在窗體的datagridview中顯示每頁10條記錄，用戶必須點擊下一個按鈕才能顯示下10條記錄。 DataGridview中是否有一些屬性，或者是否需要創建自定義控件？我們如何在winform的datagridview中進行分頁
我需要做些什麼才能做到這一點。
A
回答
27
這裏有一個簡單的工作示例，其中 BindingNavigator GUI控件使用 BindingSource對象 識別分頁符，通過其DataSource設置的IListSource自定義子類。 （感謝this answer對於 的關鍵想法。）當用戶點擊「下一頁」按鈕時，BindingNavigator觸發bindingSource1_CurrentChanged，您的代碼可以獲取所需的記錄。說明：
- 創建一個Windows窗體應用程序
- 拖到形式BindingNavigator，一個DataGridView和BindingSource的
- 用下面的代碼替換Form1.cs中：
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;
}
}
}
}
+0
@Rick Mohr：嗨！非常感謝你的代碼。這真的很有幫助。只是一個問題。我有這樣的代碼： var transactionLogCount = TransactionLogManager.GetTransactionLogCount（）; 上述命令給出了總數。 var transactionLogList = new List
6
這是我的解決方案：花了我近一年的時間才找到它併爲此感到自豪
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？將上面的代碼添加到您的項目中，將Supergrid和一個bindingnavigator控件拖到您的勝利表單中。
superGrid1.PageSize = 5;
DataTable dt = DataProvider.ExecuteDt("select * from test order by col");
superGrid1.SetPagedDataSource(dt, bindingNavigator1);
而你得到的數據沒有太多hastle結合分頁的datagridview/
+0
大剛創建自定義控件使用它很多次你應該改變一些事情1。 - 在SetPagedDataSource的開始，你應該初始化變量bs和表：bs = new BindingSource（）; tables = new BindingList
+0
你如何修改列，假設你想添加像查看，編輯和刪除列 – 2017-07-20 19:36:43
1
此問題的另一個方法：
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類不包含在這裏，它是一個簡單的類，可以從任何來源返回數據。
1
試試這個， 此代碼適用於OleDb，但也適用於SqlServer連接。 對DT（數據表）對象被填充有選擇的頁的行，假設頁面1（不爲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;
}
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這個鏈路可以幫助http://programcall.com/9/dotnet/datagridview-paging-開始.net-winforms-cs.aspx – Mou 2015-08-04 14:14:58