Silverlight中DataPager控件扩展

浏览数：16 / 时间：2015年06月09日

大家一定遇到这样的情况，想改变一下SL的DataPager的显示信息，比如希望分页控件上显示数据的总数。那么就需要扩展一下DataPager控件即可。

　　其实扩展DataPager很简单，只要获取到DataPager控件上的元素，然后再改变元素上数据。比如DataPager控件上显示“总页数”的元素是一个TextBlock,那么可以通过方法GetTemplateChild获取到，参数是元素的名称。然后通过重写方法OnApplyTemplate即可，下面请看代码

代码

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> /// <summary>
    /// 扩展DataPager类，一是要显示总数据数有多少，二是修改TextBox的宽度
    /// </summary>
    public class ExtendDataPager : DataPager
    {
        //定义变量
        TextBlock tbCurrentPagePrefix;
        TextBlock tbCurrentPageSuffix;
        Button btnNextPageButton;
        Button btnFirstPageButton;
        Button btnLastPageButton;
        Button btnPreviousPageButton;
        TextBox txtCurrentPageTextBox;

        int _dataCount = 0;

        /// <summary>
        /// 取得数据总数
        /// </summary>
        public int DataCount
        {
            get { return _dataCount; }
            set { _dataCount = value; }
        }

        double _CurrentPageTextBoxWidth = 55;

        /// <summary>
        /// 显示当前页的TextBox的宽度,默认宽度为55
        /// </summary>
        public double CurrentPageTextBoxWidth
        {
            get { return _CurrentPageTextBoxWidth; }
            set { _CurrentPageTextBoxWidth = value; }
        }


        public ExtendDataPager():base()
        {
        
        }

        /// <summary>
        /// 重写  当应用新模板时生成 System.Windows.Controls.DataPager 控件的可视化树。
        /// </summary>
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            //通过名称取得模板中的元素
            tbCurrentPagePrefix = GetTemplateChild("CurrentPagePrefixTextBlock") as TextBlock;
            tbCurrentPageSuffix = GetTemplateChild("CurrentPageSuffixTextBlock") as TextBlock;
            btnNextPageButton = GetTemplateChild("NextPageButton") as Button;
            btnFirstPageButton = GetTemplateChild("FirstPageButton") as Button;
            btnLastPageButton = GetTemplateChild("LastPageButton") as Button;
            btnPreviousPageButton = GetTemplateChild("PreviousPageButton") as Button;
            txtCurrentPageTextBox = GetTemplateChild("CurrentPageTextBox") as TextBox;

            //重写以下元素的事件
            btnNextPageButton.Click += new RoutedEventHandler(
                (o, e) =>
                {
                    ExtendItem();  
                }
                );
            btnFirstPageButton.Click += new RoutedEventHandler(
                (o, e) =>
                {
                    ExtendItem();
                }
                );
            btnLastPageButton.Click += new RoutedEventHandler(
                (o, e) =>
                {
                    ExtendItem();
                }
                );
            btnPreviousPageButton.Click += new RoutedEventHandler(
                (o, e) =>
                {
                    ExtendItem();
                }
                );
            txtCurrentPageTextBox.KeyDown += new KeyEventHandler(
                (o, e) =>
                {
                    ExtendItem();
                }
            );
            ExtendItem();
        }

        /// <summary>
        /// 扩展项
        /// </summary>
        private void ExtendItem()
        {
            //重写以下元素显示的内容以及显示当前页的TextBox的宽度
            tbCurrentPagePrefix.Text = "第";
            tbCurrentPageSuffix.Text = "页  共" + this.PageCount.ToString() + "页  共"+DataCount.ToString()+"条数据";
            txtCurrentPageTextBox.Width = CurrentPageTextBoxWidth;
        }
    }