关于数据分页的文章太多了,各有各的一套方案,但大多都很类似,要么使用存储过程,要么直接使用代码进行分页。各种方案分页的效率也不尽相同,我们不一定要找一个最高效的(根据实际的项目情况),找一个最合适的就OK了。下面我要谈的分页控件非常灵活,可以支持任意类型的数据库,同时可以支持存储过程或代码分页(会自动判断),也支持多表的分页,非常的方便。对于数据分页的相关文章,在我的博客中可以找到很多,下面我做一个简单的汇总,方便大家查阅。
1、 原创企业级控件库之大数据量分页控件
2、 再上数据分页控件(不用存储过程)
3、 RDIFramework.NET 中多表关联查询分页实例
下面要给大家分享的分页控件只做分页的处理,不做与数据库相关的操作。直接提供分页的数据给分页控件即可。它不关心你的数据来源是什么,也不关心你采用的数据分页的方式(存储过程或代码等)。这个分页控件我取名为:UcPagerEx,如下图所示:
实现分页控件的代码非常的简单,下面直接给出全部源码,大家可以参考下,整个分页控件的源码如下:
using System; using System.ComponentModel; using System.Windows.Forms; namespace RDIFramework.Controls { public delegate void PageChangedEventHandler(object sender, EventArgs e); /// <summary> /// 分页用户控件,仅提供分页信息显示及改变页码操作 /// </summary> public partial class UcPagerEx : UserControl { public event PageChangedEventHandler PageChanged; private int _pageSize; private int m_PageCount; private int _recordCount; private int _pageIndex;
public UcPagerEx()
{
InitializeComponent();
this._pageSize = 10;
this._recordCount = 0;
this._pageIndex = 1; //默认为第一页
}
/// <summary>
/// 带参数的构造函数
/// <param name="pageSize">每页记录数</param>
/// <param name="recordCount">总记录数</param>
/// </summary>
public UcPagerEx(int recordCount, int pageSize)
{
InitializeComponent();
this._pageSize = pageSize;
this._recordCount = recordCount;
this._pageIndex = 1; //默认为第一页
this.InitPageInfo();
}
protected virtual void OnPageChanged(EventArgs e)
{
if (PageChanged != null)
{
InitPageInfo();
PageChanged(this, e);
}
}
[Description("设置或获取一页中显示的记录数目"), DefaultValue(20), Category("分页")]
public int PageSize
{
set
{
this._pageSize = value;
}
get
{
return this._pageSize;
}
}
[Description("获取记录总页数"), DefaultValue(0), Category("分页")]
public int PageCount
{
get
{
return this.m_PageCount;
}
}
[Description("设置或获取记录总数"), Category("分页")]
public int RecordCount
{
set
{
this._recordCount = value;
}
get
{
return this._recordCount;
}
}
[Description("当前的页面索引, 开始为1"), DefaultValue(0), Category("分页")]
[Browsable(false)]
public int PageIndex
{
set
{
this._pageIndex = value;
}
get
{
return this._pageIndex;
}
}
/// <summary>
/// 初始化分页信息
/// <param name="pageSize">每页记录数</param>
/// <param name="recordCount">总记录数</param>
/// </summary>
public void InitPageInfo(int recordCount, int pageSize)
{
this._recordCount = recordCount;
this._pageSize = pageSize;
this.InitPageInfo();
}
/// <summary>
/// 初始化分页信息
/// <param name="recordCount">总记录数</param>
/// </summary>
public void InitPageInfo(int recordCount)
{
this._recordCount = recordCount;
this.InitPageInfo();
}
/// <summary>
/// 初始化分页信息
/// </summary>
public void InitPageInfo()
{
if (this._pageSize < 1)
this._pageSize = 10; //如果每页记录数不正确,即更改为10
if (this._recordCount < 0)
this._recordCount = 0; //如果记录总数不正确,即更改为0
//取得总页数
if (this._recordCount % this._pageSize == 0)
{
this.m_PageCount = this._recordCount / this._pageSize;
}
else
{
this.m_PageCount = this._recordCount / this._pageSize + 1;
}
//设置当前页
if (this._pageIndex > this.m_PageCount)
{
this._pageIndex = this.m_PageCount;
}
if (this._pageIndex < 1)
{
this._pageIndex = 1;
}
//设置上一页按钮的可用性
bool enable = (this.PageIndex > 1);
this.btnPrevious.Enabled = enable;
//设置首页按钮的可用性
enable = (this.PageIndex > 1);
this.btnFirst.Enabled = enable;
//设置下一页按钮的可用性
enable = (this.PageIndex < this.PageCount);
this.btnNext.Enabled = enable;
//设置末页按钮的可用性
enable = (this.PageIndex < this.PageCount);
this.btnLast.Enabled = enable;
this.txtPageIndex.Text = this._pageIndex.ToString();
this.lblPageInfo.Text = string.Format("共 {0} 条记录,每页 {1} 条,共 {2} 页", this._recordCount, this._pageSize, this.m_PageCount);
}
public void RefreshData(int page)
{
this._pageIndex = page;
EventArgs e = new EventArgs();
OnPageChanged(e);
}
private void btnFirst_Click(object sender, System.EventArgs e)
{
this.RefreshData(1);
}
private void btnPrevious_Click(object sender, System.EventArgs e)
{
if (this._pageIndex > 1)
{
this.RefreshData(this._pageIndex - 1);
}
else
{
this.RefreshData(1);
}
}
private void btnNext_Click(object sender, System.EventArgs e)
{
if (this._pageIndex < this.m_PageCount)
{
this.RefreshData(this._pageIndex + 1);
}
else if (this.m_PageCount < 1)
{
this.RefreshData(1);
}
else
{
this.RefreshData(this.m_PageCount);
}
}
private void btnLast_Click(object sender, System.EventArgs e)
{
this.RefreshData(this.m_PageCount > 0 ? this.m_PageCount : 1);
}
private void txtPageIndex_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
int num;
try
{
num = Convert.ToInt16(this.txtPageIndex.Text);
}
catch
{
num = 1;
}
if (num > this.m_PageCount)
num = this.m_PageCount;
if (num < 1)
num = 1;
this.RefreshData(num);
}
}
}
} 代码基本没有什么难度,相信大家都能看得懂,那么如何使用这个控件呢?
首先在生成的工具箱中拖动这个分页控件到界面上,再后再做数据绑定的代码即可。我直接展示一个已经做成的界面,如下图所示:
上面就是分页的效果,如何实现的呢?下面给出实现代码。
我们可以在Load事件中调用下面的Search()方法对数据进行绑定,如下代码所示:
private void Search()
{
var recordCount = 0;
this.DTProductInfo = GetData(out recordCount, ucPager.PageIndex, ucPager.PageSize, this.searchValue);
ucPager.RecordCount = recordCount;
ucPager.InitPageInfo();
// 加载绑定数据
this.GetList();
}
private DataTable GetData(out int recordCount, int pageIndex, int pageSize,string search) { return new ProductInfoManager(dbProvider).GetDTByPage(out recordCount, pageIndex, pageSize, search,ProductInfoTable.FieldCreateOn + " DESC "); }
public override void GetList() { this.dgvProductInfo.AutoGenerateColumns = false; if (this.DTProductInfo.Columns.Count > 0) { this.DTProductInfo.DefaultView.Sort = ProductInfoTable.FieldCreateOn; }
this.dgvProductInfo.DataSource = this.DTProductInfo.DefaultView;
this.SetControlState();
} 同时需要对UcPagerEx的PageChanged事件做处理,以启用用户分页的需求,代码如下:
private void ucPager_PageChanged(object sender, EventArgs e) { var holdCursor = this.Cursor; this.Cursor = Cursors.WaitCursor; Search(); this.Cursor = holdCursor; } 附注:对于上面的“GetDTByPage”方法可以任意实现,可以调用存储过程,也可以使用代码进行分页。只要返回分页的数据即可。