如何在WinForm中对DataGrid进行分页显示（转）

在网上大多数对DataGrid进行分页的例子都是Asp.net环境下的，其实在WinForm中也很简单。以下就是简单举一个例子。

首先，需要定义一个数据库存储过程，用来获得指定页的数据记录，大致的数据结构和存储过程如下（在SQL Server 2000下）：

字段名	类型	备注
EmployeeID	Int	自增字段，主键
EmployeeName	Varchar(20)
Salary	Int
CellPhone	Varchar(20)
EmailAddress	Varchar(20)

存储过程为：

CREATE PROCEDURE GetEmployees @EmployeeNum int, @StartNO int, @@TotalCount INT OUTPUT, @@RealNum INT OUTPUT AS

-- Get employees from DB through the specific number and the start position

DECLARE @PreRecCount VARCHAR( 10 )

DECLARE @CurRecCount VARCHAR( 10 )

SELECT @@TotalCount = COUNT(*) FROM EmployeeInfo

IF @@TotalCount > ( @StartNO + 1 ) * @EmployeeNum

SET @@RealNum = @EmployeeNum

ELSE

SET @@RealNum = @@TotalCount - @StartNO * @EmployeeNum

-- Get employees by the computed number

SET @CurRecCount = CAST( @StartNO * @EmployeeNum + @@RealNum AS VARCHAR( 10 ) )

IF @STARTNO = 0

EXEC( 'SELECT TOP ' + @CurRecCount + ' * FROM EmployeeInfo ORDER BY EmployeeID ASC' )

ELSE

BEGIN

SET @PreRecCount = CAST( @StartNO * @EmployeeNum AS VARCHAR( 10 ) )

EXEC( 'SELECT TOP ' + @CurRecCount + ' * FROM EmployeeInfo WHERE EmployeeID NOT IN '

+ '(SELECT TOP ' + @PreRecCount + ' EmployeeID FROM EmployeeInfo ORDER BY EmployeeID ASC) '

+ 'ORDER BY EmployeeID ASC'

)

END

GO

然后就是调用存储过程来进行显示，比较完整的源代码如下：

//------------------------ Multi Page Demo ------------------------------------

//-----------------------------------------------------------------------------

//---File:frmMultiPagesDemo.cs

//---Description:The main form file to show how to use pages in datagrid

//---Author:Knight

//---Date:Mar.23, 2006

//-----------------------------------------------------------------------------

//-----------------------{ Multi Page Demo }-----------------------------------

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.Data.SqlClient;

namespace CSDataGrid

{

/// <summary>

/// Summary description for frmMultiPages.

/// </summary>

public class frmMultiPages : System.Windows.Forms.Form

{

private System.Windows.Forms.Label lblPageInfo;

private System.Windows.Forms.Button btnPrevious;

private System.Windows.Forms.Button btnNext;

protected SqlConnection sqlConn = new SqlConnection();

protected SqlDataAdapter sqlDAdapter = null;

protected DataSet sqlRecordSet = null;

private int nCurPageNum = 0;

private const int REC_NUM_PER_PAGE = 3;

private int nTotalCount;

private int nRealNum;

private int nTotalPage;

private System.Windows.Forms.DataGrid dtgUserInfo;

/// <summary>

/// Required designer variable.

/// </summary>

private System.ComponentModel.Container components = null;

public frmMultiPages()

{

//

// Required for Windows Form Designer support

//

InitializeComponent();

//

// TODO: Add any constructor code after InitializeComponent call

//

}

/// <summary>

/// Clean up any resources being used.

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if(components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows Form Designer generated code

/// <summary>

/// Required method for Designer support - do not modify

/// the contents of this method with the code editor.

/// </summary>

private void InitializeComponent()

{

this.dtgUserInfo = new System.Windows.Forms.DataGrid();

this.lblPageInfo = new System.Windows.Forms.Label();

this.btnPrevious = new System.Windows.Forms.Button();

this.btnNext = new System.Windows.Forms.Button();

((System.ComponentModel.ISupportInitialize)(this.dtgUserInfo)).BeginInit();

this.SuspendLayout();

//

// dtgUserInfo

//

this.dtgUserInfo.DataMember = "";

this.dtgUserInfo.HeaderForeColor = System.Drawing.SystemColors.ControlText;

this.dtgUserInfo.Location = new System.Drawing.Point(16, 16);

this.dtgUserInfo.Name = "dtgUserInfo";

this.dtgUserInfo.Size = new System.Drawing.Size(552, 416);

this.dtgUserInfo.TabIndex = 0;

//

// lblPageInfo

//

this.lblPageInfo.AutoSize = true;

this.lblPageInfo.Location = new System.Drawing.Point(16, 440);

this.lblPageInfo.Name = "lblPageInfo";

this.lblPageInfo.Size = new System.Drawing.Size(83, 16);

this.lblPageInfo.TabIndex = 1;

this.lblPageInfo.Text = "{0} of {1} Pages";

//

// btnPrevious

//

this.btnPrevious.Location = new System.Drawing.Point(408, 440);

this.btnPrevious.Name = "btnPrevious";

this.btnPrevious.TabIndex = 2;

this.btnPrevious.Text = "Previous";

this.btnPrevious.Click += new System.EventHandler(this.btnPrevious_Click);

//

// btnNext

//

this.btnNext.Location = new System.Drawing.Point(488, 440);

this.btnNext.Name = "btnNext";

this.btnNext.TabIndex = 3;

this.btnNext.Text = "Next";

this.btnNext.Click += new System.EventHandler(this.btnNext_Click);

//

// frmMultiPages

//

this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

this.ClientSize = new System.Drawing.Size(584, 469);

this.Controls.Add(this.btnNext);

this.Controls.Add(this.btnPrevious);

this.Controls.Add(this.lblPageInfo);

this.Controls.Add(this.dtgUserInfo);

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;

this.MaximizeBox = false;

this.Name = "frmMultiPages";

this.Text = "Multi Pages In DataGrid";

this.Load += new System.EventHandler(this.frmMultiPages_Load);

((System.ComponentModel.ISupportInitialize)(this.dtgUserInfo)).EndInit();

this.ResumeLayout(false);

}

#endregion

private void frmMultiPages_Load(object sender, System.EventArgs e)

{

//Set connection string

sqlConn.ConnectionString = yourconnectionstring;

//Connect to DB

if( ConnectDB() )

{

//Bind data to datagrid

BindData();

}

}

/// <summary>

/// Connect to DB

/// </summary>

/// <returns>If connected, return True; else return False</returns>

private bool ConnectDB()

{

//Check current connection's state

try

{

if( sqlConn.State == ConnectionState.Closed

|| sqlConn.State == ConnectionState.Broken )

{

//Connection is not available

sqlConn.Close();

}

else

//Connection is available

return true;

}

catch{};

//Re-connect

try

{

sqlConn.Open();

}

catch(SqlException e)

{

//Sql's exception

MessageBox.Show( e.Message );

}

catch(Exception e)

{

//Other exception

MessageBox.Show( e.Message );

}

if( sqlConn.State == ConnectionState.Closed

|| sqlConn.State == ConnectionState.Broken )

//Connection is not available

return false;

else

//Connection is available

return true;

}

private void AddDGStyle()

{

DataGridTableStyle ts1 = new DataGridTableStyle();

//specify the table from dataset (required step)

ts1.MappingName = "EmployeeInfo";

PropertyDescriptorCollection pdc = this.BindingContext

[sqlRecordSet, "EmployeeInfo"].GetItemProperties();

DataGridColumnStyle TextCol = new DataGridTextBoxColumn( pdc["EmployeeID"], "i" );

TextCol.MappingName = "EmployeeID";

TextCol.HeaderText = "EmployeeID";

TextCol.Width = 0;

TextCol.ReadOnly = true;

ts1.GridColumnStyles.Add(TextCol);

TextCol = new DataGridTextBoxColumn();

TextCol.MappingName = "EmployeeName";

TextCol.HeaderText = "Employee Name";

TextCol.Width = 100;

ts1.GridColumnStyles.Add(TextCol);

TextCol = new DataGridTextBoxColumn( pdc["Salary"], "i" );

TextCol.MappingName = "Salary";

TextCol.HeaderText = "Salary";

TextCol.Width = 80;

ts1.GridColumnStyles.Add(TextCol);

TextCol = new DataGridTextBoxColumn();

TextCol.MappingName = "CellPhone";

TextCol.HeaderText = "Cell Phone";

TextCol.Width = 80;

ts1.GridColumnStyles.Add(TextCol);

TextCol = new DataGridTextBoxColumn();

TextCol.MappingName = "EmailAddress";

TextCol.HeaderText = "Email Address";

TextCol.Width = 100;

ts1.GridColumnStyles.Add(TextCol);

dtgUserInfo.TableStyles.Add(ts1);

}

private void GetEmployeeData()

{

sqlDAdapter = new SqlDataAdapter( );

SqlCommand sqlComm = new SqlCommand();

sqlComm.Connection = sqlConn;

sqlComm.CommandText = "GetEmployees";

sqlComm.CommandType = CommandType.StoredProcedure;

sqlComm.Parameters.Add ( "@EmployeeNum", REC_NUM_PER_PAGE );

sqlComm.Parameters.Add ( "@StartNO", nCurPageNum );

SqlParameter sqlPar = sqlComm.Parameters.Add ( "@@TotalCount", SqlDbType.Int );

sqlPar.Direction = ParameterDirection.Output;

sqlPar = sqlComm.Parameters.Add ( "@@RealNum", SqlDbType.Int );

sqlPar.Direction = ParameterDirection.Output;

sqlDAdapter.SelectCommand = sqlComm;

//Fill dataset

sqlRecordSet = new DataSet();

sqlDAdapter.Fill( sqlRecordSet, "EmployeeInfo" );

nTotalCount = Convert.ToInt32( sqlComm.Parameters["@@TotalCount"].Value.ToString() );

nRealNum = Convert.ToInt32( sqlComm.Parameters["@@RealNum"].Value.ToString() );

sqlComm.Dispose();

nTotalPage = nTotalCount - nTotalCount % REC_NUM_PER_PAGE;

nTotalPage /= REC_NUM_PER_PAGE;

nTotalPage++;

lblPageInfo.Text = string.Format( "{0} of {1} pages", nCurPageNum + 1, nTotalPage );

if( nCurPageNum + 1 >= nTotalPage )

btnNext.Enabled = false;

else

btnNext.Enabled = true;

if( nCurPageNum == 0 )

btnPrevious.Enabled = false;

else

btnPrevious.Enabled = true;

}

private void BindData()

{

GetEmployeeData();

//Bind datagrid with dataset

dtgUserInfo.SetDataBinding( sqlRecordSet, "EmployeeInfo");

//Add datagrid style

AddDGStyle();

}

private void ReBindData()

{

GetEmployeeData();

//Bind datagrid with dataset

dtgUserInfo.SetDataBinding( sqlRecordSet, "EmployeeInfo");

}

private void btnPrevious_Click(object sender, System.EventArgs e)

{

nCurPageNum--;

sqlRecordSet.Tables["EmployeeInfo"].Rows.Clear();

ReBindData();

}

private void btnNext_Click(object sender, System.EventArgs e)

{

nCurPageNum++;

sqlRecordSet.Tables["EmployeeInfo"].Rows.Clear();

ReBindData();

}

}

}