WinForm下编写分页控件，实现DataGridView的分页效果
前几天做C/S项目的时候用到了分页查询，所以就想去网上找一些封装好的分页控件，类似BS项目中的那种。但是找了好几个都不是特别的好，没有自己想要的。而且WinForm 里面的DataGridView也不像WebForm里面的GridView那样有自带的分页功能。没办法还是自己动手封装一个吧，以后复用也方便。
从网上找了几个demo做了一下，实现挺简单的。
用到的方法就是编写一个用户控件，下面说明如何实现：
一，先画界面
新建一个用户控件，然后拖拽几个标签，文本框和按钮，排列好。如下图所示：
二，编写代码
public partial class PagerControl : UserControl
{
#region 构造函数
public PagerControl()
{
InitializeComponent();
}
#endregion
#region 分页字段和属性
private int pageIndex = 1;
/// <summary>
/// 当前页数
/// </summary>
public virtual int PageIndex
{
get { return pageIndex; }
set { pageIndex = value; }
}
private int pageSize = 100;
/// <summary>
/// 每页记录数
/// </summary>
public virtual int PageSize
{
get { return pageSize; }
set { pageSize = value; }
}
private int recordCount = 0;
/// <summary>
/// 总记录数
/// </summary>
public virtual int RecordCount
{
get { return recordCount; }
set { recordCount = value; }
}
private int pageCount = 0;
/// <summary>
/// 总页数
/// </summary>
public int PageCount
{
get
{
if (pageSize != 0)
{
pageCount = GetPageCount();
}
return pageCount;
}
}
#endregion
#region 页码变化时触发事件
public event EventHandler OnPageChanged;
#endregion
#region 分页及相关事件功能实现
/// <summary>
/// 设窗体控件全部可用
/// </summary>
private void SetFormCtrEnabled()
{
linkFirst.Enabled = true;
linkPrevious.Enabled = true;
linkNext.Enabled = true;
linkLast.Enabled = true;
btnGo.Enabled = true;
}
/// <summary>
/// 计算总页数
/// </summary>
/// <returns></returns>
private int GetPageCount()
{
if (PageSize == 0)
{
return 0;
}
int pageCount = RecordCount / PageSize;
if (RecordCount % PageSize == 0)
{
pageCount = RecordCount / PageSize;
}
else
{
pageCount = RecordCount / PageSize + 1;
}
return pageCount;
}
/// <summary>
/// 用于客户端调用
/// </summary>
public void DrawControl(int count)
{
recordCount = count;
DrawControl(false);
}
/// <summary>
/// 根据不同的条件，改变页面控件的呈现状态
/// </summary>
private void DrawControl(bool callEvent)
{
lblCurrentPage.Text = PageIndex.ToString();
lblPageCount.Text = PageCount.ToString();
lblTotalCount.Text = RecordCount.ToString();
txtPageSize.Text = PageSize.ToString();
if (callEvent && OnPageChanged != null)
{
OnPageChanged(this, null);//当前分页数字改变时，触发委托事件
}
SetFormCtrEnabled();
if (PageCount == 1)//有且仅有一页时
{
linkFirst.Enabled = false;
linkPrevious.Enabled = false;
linkNext.Enabled = false;
linkLast.Enabled = false;
btnGo.Enabled = false;
}
else if (PageIndex == 1)//当前页为第一页时
{
linkFirst.Enabled = false;
linkPrevious.Enabled = false;
}
else if (PageIndex == PageCount)//当前页为最后一页时
{
linkNext.Enabled = false;
linkLast.Enabled = false;
}
}
#endregion
#region 相关控件事件
//首页按钮
private void linkFirst_Click(object sender, EventArgs e)
{
PageIndex = 1;
DrawControl(true);
}
//上一页按钮
private void linkPrevious_Click(object sender, EventArgs e)
{
PageIndex = Math.Max(1, PageIndex - 1);
DrawControl(true);
}
//下一页按钮
private void linkNext_Click(object sender, EventArgs e)
{
PageIndex = Math.Min(PageCount, PageIndex + 1);
DrawControl(true);
}
//尾页按钮
private void linkLast_Click(object sender, EventArgs e)
{
PageIndex = PageCount;
DrawControl(true);
}
/// <summary>
/// 按下enter键，执行跳转页面功能
/// </summary>
private void txtPageNum_KeyPress(object sender, KeyPressEventArgs e)
{
btnGo_Click(null, null);
}
/// <summary>
/// 跳转页数限制
/// </summary>
private void txtPageNum_TextChanged(object sender, EventArgs e)
{
int num = 0;
if (int.TryParse(txtPageNum.Text.Trim(), out num) && num > 0)
{ //TryParse 函数，将字符串转换成等效的整数，返回bool型，判断是否转换成功。
//输入除数字以外的字符是转换不成功的
if (num > PageCount) //输入数量大于最大页数时，文本框自动显示最大页数
{
txtPageNum.Text = PageCount.ToString();
}
}
}
/// <summary>
/// 跳转按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnGo_Click(object sender, EventArgs e)
{
int num = 0;
if (int.TryParse(txtPageNum.Text.Trim(), out num) && num > 0)
{
PageIndex = num;
DrawControl(true);
}
}
#endregion
bool isTextChanged = false;
/// <summary>
/// 每页显示的记录数改变时
/// </summary>
private void txtPageSize_TextChanged(object sender, EventArgs e)
{
int num = 0;
//输入不符合规范时，默认设置为100
if (!int.TryParse(txtPageSize.Text.Trim(), out num) || num <= 0)
{
num = 100;
txtPageSize.Text = "100";
}
else
{
isTextChanged = true;
}
pageSize = num;
}
/// <summary>
/// 光标离开 每页设置文本框时，显示到首页
private void txtPageSize_Leave(object sender, EventArgs e)
{
if (isTextChanged)
{
isTextChanged = false;
linkFirst_Click(null, null);
}
}
}
三，客户端调用
public partial class frmPagerDemo : Form
{
public frmPagerDemo()
{
InitializeComponent();
}
private void StartForm_Load(object sender, EventArgs e)
{
//创建一个文件数据库表。
MDataTable.CreateSchema("Users.txt", false, new string[] { "选择", "用户名", "密码", "性别", "注册日期" }, SqlDbType.Bit, SqlDbType.NVarChar, SqlDbType.NVarChar, SqlDbType.NVarChar, SqlDbType.NVarChar);
for (int i = 0; i < 200; i++)//插入200条数据。
{
using (MAction action = new MAction("Users.txt", "Txt Path={0}"))
{
action.Set("选择", i % 2 == 0);
action.Set("用户名", "Obama_" + i);
action.Set("密码", "123" + i);
action.Set("性别", "男");
action.Set("注册日期", DateTime .Now.ToShortDateString());
action.Insert(InsertOp.None);
}
}
LoadData();
//激活OnPageChanged事件
pagerControl1.OnPageChanged += new EventHandler(pagerControl1_OnPageChanged);
}
/// <summary>
/// 页数变化时调用绑定数据方法
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pagerControl1_OnPageChanged(object sender, EventArgs e)
{
LoadData();
}
/// <summary>
/// 重新加载数据
/// </summary>
private void LoadData()
{
int count;
using (MAction action = new MAction("Users.txt", "Txt Path={0}"))
{
action.Select(pagerControl1.PageIndex, pagerControl1.PageSize, string.Empty, out count).Bind(gvUsers);
pagerControl1.DrawControl(count);
}
}
}
四，显示效果
至此一个WinForm版的分页控件制作就完成了。
有问题的地方欢迎指出。
代码下载：http://download.csdn.net/detail/u010028869/7983011