C#DataGridView分页显示代码详解

//导入命名空间部分省略
DBClass.DBExecute dbexecute = new DBExecute();
string connectionString = @"Data Source=ServerName;Database=DatabaseName;integrated security=true";
#region 初始化分页显示的参数
static int rowsall = 0;//总行数
static int pageall = 0;//总页数
static int page = 0;//第几页
static int count = 20;//返回20行
static int start = 0;//从第start行开始返回
#endregion
#region 建立数据库链接
/// <summary>
/// 建立数据库连接
/// </summary>
/// <returns>返回SqlConnection对象</returns>
public SqlConnection getcon()
{
SqlConnection myCon = new SqlConnection(connectionString);
return myCon;
}
#region 设置DataGridView分页显示的参数，和初次绑定
/// <summary>
/// 设置DataGridView分页显示的参数，和初次绑定
/// </summary>
/// <param name="sqlstr">设置查询的sql语句</param>
/// <param name="table">设置返回绑定的DataSet中的表的名称</param>
/// <param name="dgv">要绑定的DataGridView</param>
public void upPage(string sqlstr,string table,DataGridView dgv)
{
rowsall = dbexecute.getds(sqlstr, table).Tables.Rows.Count;//总行数
if (rowsall == 0)
{
//如果没有数据则将第一页、上一页、下一页、最后一页设置为不可用；并设置其他参数
toolStripButton2.Enabled = false;
toolStripButton3.Enabled = false;
toolStripButton4.Enabled = false;
toolStripButton5.Enabled = false;
page = 0;
pageall = 0;
rowsall = 0;
dgv.DataSource = null;
tslRowsall.Text = rowsall.ToString();
tslPageAll.Text = pageall.ToString();
tslPage.Text = page.ToString();
return;
}
if (rowsall > 0)//判断是否有内容
{
page = 1;//如果有内容，设置为第一页
start = 0;
}
int yushu = rowsall % count;//是否存在余行
if (yushu == 0)//不存在余行时设置总页数
{
if (rowsall > 0 && rowsall <= count)
{
pageall = 1;
}
else
{
pageall = rowsall / count;
}
}
else//存在余行时设置总页数
{
pageall = rowsall / count + 1;
}
{//设置显示数据，


tslRowsall.Text = rowsall.ToString();
tslPageAll.Text = pageall.ToString();
tslPage.Text = page.ToString();
if (pageall > 0)
{ //设置跳转到第几页



tscbPage.Items.Clear();
for (int i = 1; i <= pageall; i++)
tscbPage.Items.Add(i);
}
}
selectsql = sqlstr; //设置sql语句
dgv.DataSource = gettb(selectsql ,start,count,"table")‘;//绑定DataGridView
}
#endregion
#region
/// <summary>
/// 分页返回DataTable
/// </summary>
/// <param name="sql">查询的sql语句</param>
/// <param name="i">从第i行开始返回</param>
/// <param name="j">共返回j行记录</param>
/// <param name="tablename">返回DataSet中的表明</param>
/// <returns>返回DataTable</returns>
public DataTable gettb(string sql, int start, int count, string tablename)
{
SqlConnection con = this.getcon();
DataSet myds = new DataSet();
SqlDataAdapter sda = new SqlDataAdapter(sql, con);
sda.Fill(myds, start, count, tablename);
return myds.Tables[tablename];
}
#endregion
/// 第一页
private void toolStripButton2_Click(object sender, EventArgs e)
{
if (pageall > 1)
{
start = 0;
page = 1;
tslPage.Text = page.ToString();
this.dataGridView1.DataSource = gettb(selectsql ,start,count,"table")‘;//绑定DataGridView
}
}
// 上一页
private void toolStripButton3_Click(object sender, EventArgs e)
{
if (page >1)
{
page--;
start -= 20;
tslPage.Text = page.ToString();
this.dataGridView1.DataSource = gettb(selectsql ,start,count,"table")‘;//绑定DataGridView
}
}
/// 下一页
private void toolStripButton4_Click(object sender, EventArgs e)
{
if (page < pageall)
{
page++;
start += 20;
tslPage.Text = page.ToString();
this.dataGridView1.DataSource = gettb(selectsql ,start,count,"table")‘;//绑定DataGridView
}

}
//最后一页
private void toolStripButton5_Click(object sender, EventArgs e)
{
if (pageall > 0)
{
start = (pageall - 1) * count;
page = pageall;
tslPage.Text = page.ToString();
this.dataGridView1.DataSource = gettb(selectsql ,start,count,"table")‘;//绑定DataGridView
}
}

上边红色部分获取总行数是调用的数据操作层里的getds方法返回一个数据集，类和方法如下：
class DBExecute
{
string G_str_connectionString = @"Data Source=70AB360C9ABA49E/SQLEXPRESS;Database=db_CRM;integrated security=true";//这里设置成你自己的连接
public DBExecute(){}
public DBExecute(string M_str_connectionString)
{
G_str_connectionString = M_str_connectionString;
}
#region 建立数据库链接
/// <summary>
/// 建立数据库连接
/// </summary>
/// <returns>返回SqlConnection对象</returns>
public SqlConnection getcon()
{
string M_str_sqlcon = G_str_connectionString;
SqlConnection myCon = new SqlConnection(M_str_sqlcon);
return myCon;
}
#endregion
#region 查询数据库返回一个DataSet对象
/// <summary>
/// 查询数据库返回一个DataSet对象
/// </summary>
/// <param name="M_str_sqlstr">SQL语句</param>
/// <param name="M_str_table">表名</param>
/// <returns>返回DataSet对象</returns>
public DataSet getds(string M_str_sqlstr, string M_str_table)
{
DataSet myds = new DataSet();
SqlConnection sqlcon = this.getcon();
SqlDataAdapter sqlda = new SqlDataAdapter(M_str_sqlstr, sqlcon);
sqlda.Fill(myds, M_str_table);
return myds;
}
#endregion
}

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