WPF DataPager控件

最近在项目中遇到远程加载数据的问题,由于服务器采用分页方式返回数据,因此客户端也相应的制作了一个分页控件.代码相对简单,算做入门级的源码.

 

效果如图:

初步分析,分页功能只需要3个核心变量:PageIndex,PageSize,TotalCount,2个事件:PageChanging,PageChanged,1个方法InitData.

PageIndex:记录当前所在页

PageSize:记录每页显示的条目数

TotalCount:条目总数

由TotalCount和PageSize可以得到PageCount

PageChanging事件作为分页的预处理事件,修改事件参数PageChangingEventArgs的IsCancel属性可以取消分页,这个是参考其他分页控件的属性

PageChanged事件是分页后的处理事件,应用程序可以在此时获取PageIndex进行操作.

InitData方法在数据加载时调用(主要是TotalCount属性),用于初始化上面提到的核心变量.

 

WPF提供了很强大和实用的Binding功能,在开发控件时,应该尽量把属性设计成依赖属性.因此我把PageIndex,PageSize,TotalCount属性全部设计成依赖属性,并注册了部分回调方法.这样也可以很方便的实现控件和ViewModel的绑定.

 

核心代码如下:

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///     /// DataPager.xaml 的交互逻辑     ///     public partial class DataPager : UserControl, INotifyPropertyChanged     {         public DataPager()         {             InitializeComponent();         }         ///         /// 分页前处理的事件,如果设置e.IsCancel=True将取消分页         ///         public event PageChangingRouteEventHandler PageChanging;         ///         /// 分页后处理的事件         ///         public event PageChangedRouteEventHandler PageChanged;           #region 依赖属性         ///         /// 当前页         ///         public int PageIndex         {             get { return (int)GetValue(PageIndexProperty); }             set { SetValue(PageIndexProperty, value); }         }           // Using a DependencyProperty as the backing store for CurrentPage.  This enables animation, styling, binding, etc...         public static readonly DependencyProperty PageIndexProperty =             DependencyProperty.Register("PageIndex", typeof(int), typeof(DataPager), new UIPropertyMetadata(1, (sender, e) =>             {                 var dp = sender as DataPager;                 dp.ChangeNavigationButtonState();             }));             ///         /// 每页显示数据大小         ///         public int PageSize         {             get { return (int)GetValue(PageSizeProperty); }             set { SetValue(PageSizeProperty, value); InitData(); }         }           // Using a DependencyProperty as the backing store for PageSize.  This enables animation, styling, binding, etc...         public static readonly DependencyProperty PageSizeProperty =             DependencyProperty.Register("PageSize", typeof(int), typeof(DataPager), new UIPropertyMetadata(20, (sender, e) =>             {                 var dp = sender as DataPager;                 if (dp == null) return;                 dp.ChangeNavigationButtonState();             }));             ///         /// 记录数量         ///         public int TotalCount         {             get { return (int)GetValue(TotalCountProperty); }             set             {                 SetValue(TotalCountProperty, value);             }         }           // Using a DependencyProperty as the backing store for TotalCount.  This enables animation, styling, binding, etc...         public static readonly DependencyProperty TotalCountProperty =             DependencyProperty.Register("TotalCount", typeof(int), typeof(DataPager), new UIPropertyMetadata(0, (sender, e) =>             {                 var dp = sender as DataPager;                 if (dp == null) return;                 dp.InitData();                 dp.ChangeNavigationButtonState();             }));             ///         /// 总页数         ///         public int PageCount         {             get { return (int)GetValue(PageCountProperty); }             private set { SetValue(PageCountProperty, value); }         }           // Using a DependencyProperty as the backing store for PageCount.  This enables animation, styling, binding, etc...         public static readonly DependencyProperty PageCountProperty =             DependencyProperty.Register("PageCount", typeof(int), typeof(DataPager), new UIPropertyMetadata(1));                       ///         /// 是否可以点击首页和上一页按钮         ///         public bool CanGoFirstOrPrev         {             get             {                 if (PageIndex <= 1) return false;                 return true;             }         }         ///         /// 是否可以点击最后页和下一页按钮         ///         public bool CanGoLastOrNext         {             get             {                 if (PageIndex >= PageCount) return false;                 return true;             }         }         #endregion         ///         /// 点击首页按钮         ///         ///         ///         private void btnFirst_Click(object sender, RoutedEventArgs e)         {             OnPageChanging(1);         }         ///         /// 点击上一页按钮         ///         ///         ///         private void btnPrev_Click(object sender, RoutedEventArgs e)         {             OnPageChanging(this.PageIndex - 1);         }         ///         /// 点击下一页按钮         ///         ///         ///         private void btnNext_Click(object sender, RoutedEventArgs e)         {             OnPageChanging(this.PageIndex + 1);         }         ///         /// 点击末页按钮         ///         ///         ///         private void btnLast_Click(object sender, RoutedEventArgs e)         {             OnPageChanging(this.PageCount);         }         ///         /// 点击跳转按钮         ///         ///         ///         private void btnGoTo_Click(object sender, RoutedEventArgs e)         {             int pageIndex = 1;             try             {                 pageIndex = Convert.ToInt32(txtPageIndex.Text);             }             catch             {                }             finally             {                 OnPageChanging(pageIndex);             }         }         ///         /// 页码更改         ///         ///         internal void OnPageChanging(int pageIndex)         {             if (pageIndex < 1) pageIndex = 1;             if (pageIndex > this.PageCount) pageIndex = this.PageCount;               var oldPageIndex = this.PageIndex;             var newPageIndex = pageIndex;             var eventArgs = new PageChangingEventArgs() { OldPageIndex = oldPageIndex, NewPageIndex = newPageIndex };             if (this.PageChanging != null)             {                 this.PageChanging(this, eventArgs);             }             if (!eventArgs.IsCancel)             {                 this.PageIndex = newPageIndex;                 if (this.PageChanged != null)                 {                     this.PageChanged.Invoke(this, new PageChangedEventArgs() { CurrentPageIndex = this.PageIndex });                 }             }         }         ///         /// 通知导航按钮(首页,上一页,下一页,末页)状态的更改         ///         void ChangeNavigationButtonState()         {             this.NotifyPropertyChanged("CanGoFirstOrPrev");             this.NotifyPropertyChanged("CanGoLastOrNext");         }         ///         /// 初始化数据         ///         void InitData()         {             if (this.TotalCount == 0)             {                 this.PageCount = 1;             }             else             {                 this.PageCount = this.TotalCount % this.PageSize > 0 ? (this.TotalCount / this.PageSize) + 1 : this.TotalCount / this.PageSize;             }             if (this.PageIndex < 1)             {                 this.PageIndex = 1;             }             if (this.PageIndex > this.PageCount)             {                 this.PageIndex = this.PageCount;             }             if (this.PageSize < 1)             {                 this.PageSize = 20;             }         }             #region INotifyPropertyChanged成员         public event PropertyChangedEventHandler PropertyChanged;         public void NotifyPropertyChanged(string propertyName)         {             if (this.PropertyChanged != null)             {                 this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));             }         }         #endregion     }

 

 

Xaml中使用如下:

<my:DataPager PageChanged="dataPager1_PageChanged" PageChanging="dataPager1_PageChanging"  TotalCount="{Binding TotalCount}" PageSize="20" PageIndex="{Binding PageIndex}" x:Name="dataPager1" VerticalAlignment="Top" />

 

源码下载