事件与委托例子

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace DelegateAndEvent

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        List _list;
public MainWindow()

        {

            InitializeComponent();

            this.Loaded += new RoutedEventHandler(MainWindow_Loaded);

        }
void MainWindow_Loaded(object sender, RoutedEventArgs e)

        {

            _list = new List();

            this.sp_list.Children.Insert(0, _list);
_list.SumEvent += new List.SumEvenetHandler(_list_SumEvent);
}
void _list_SumEvent(List.SumEvenetArgs e)

        {

            this.tb_sum.Text = e.Count.ToString();

        }

    }

}

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Shapes;

using System.Collections;

using System.Windows.Threading;

using System.Data;

using System.Data.Sql;

namespace DelegateAndEvent

{

    /// <summary>

    /// List.xaml 的交互逻辑

    /// </summary>

    public partial class List : ListView

    {

        public ListView objListView = new ListView();

        GridView objBillGridView = new GridView();

        int rows = 0;

        System.Data.DataTable dt = new System.Data.DataTable();

        TextBox tb;

        int tag;

        DispatcherTimer dst;
/// <summary>

        /// 注册委托

        /// </summary>

        /// <param name="e"></param>

        public delegate void SumEvenetHandler(SumEvenetArgs e);
/// <summary>

        /// 注册事件

        /// </summary>

        public event SumEvenetHandler SumEvent;
public virtual void OnSumEvent()

        {

            if (SumEvent != null)

            {

                SumEvenetArgs e = new SumEvenetArgs(dt);

                SumEvent(e);

            }

        }
public double SumCount;
/// <summary>

        ///

        /// </summary>

        public class SumEvenetArgs : EventArgs

        {

            private double count;
public double Count

            {

                get { return count; }

                set { count = value; }

            }
public SumEvenetArgs(DataTable dt)

            {

                this.count = (from p in dt.AsEnumerable()

                              select p).Sum(x => Convert.ToDouble(x.Field<string>("text")));

            }

        }
public List()

        {

            InitializeComponent();

        }
private void ListView_Loaded(object sender, RoutedEventArgs e)

        {

            objListView = sender as ListView;

            objBillGridView = new GridView();

            GridViewColumn gvc = new GridViewColumn();

            gvc.Header = "求和";

            gvc.CellTemplate = (DataTemplate)this.Resources["dt_text"];

            objBillGridView.Columns.Add(gvc);
objListView.View = objBillGridView;
dt.Columns.Add("text", typeof(string));

            dt.Columns.Add("tag", typeof(int));

            dt.Rows.Add();

            dt.Rows[rows]["text"] = "10";

            dt.Rows[rows]["tag"] = rows + 1;

            rows++;
objListView.ItemsSource = dt.DefaultView;
OnSumEvent();

        }
private void TextBox_TextChanged(object sender, TextChangedEventArgs e)

        {

            TextBox tbx = sender as TextBox;

            if (tbx.Text == "")

            {

                return;

            }

            OnSumEvent();

        }
private void TextBox_KeyDown(object sender, KeyEventArgs e)

        {

            if (e.Key == Key.Enter)

            {

                if (tag == dt.Rows.Count)

                {

                    dt.Rows.Add();

                    dt.Rows[rows]["text"] = "0";

                    dt.Rows[rows]["tag"] = rows + 1;

                    rows++;

                }

                dst = new DispatcherTimer();

                dst.IsEnabled = true;

                dst.Start();

                dst.Interval = TimeSpan.FromSeconds(0.1);

                dst.Tick += new EventHandler(dst_Tick);

            }

        }
void dst_Tick(object sender, EventArgs e)

        {

            dst.Stop();

            IEnumerable<TextBox> _tx = FindChildren<TextBox>(this);
TextBox objcmbCtrls = _tx.ElementAt<TextBox>(tag) as TextBox;
objcmbCtrls.Focus();

            dst = null;

            OnSumEvent();

        }
private void TextBox_GotFocus(object sender, RoutedEventArgs e)

        {

            tb = sender as TextBox;

            tag = int.Parse(tb.Tag.ToString());

            OnSumEvent();

        }
#region 找控件

        public IEnumerable<T> FindChildren<T>(DependencyObject parent) where T : class

        {

            var count = VisualTreeHelper.GetChildrenCount(parent);

            if (count > 0)

            {

                for (var i = 0; i < count; i++)

                {

                    var child = VisualTreeHelper.GetChild(parent, i);

                    var t = child as T;

                    if (t != null)

                        yield return t;
var children = FindChildren<T>(child);

                    foreach (var item in children)

                        yield return item;

                }

            }

        }

        #endregion

    }

}

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