WPF数据绑定

1.绑定DataTable 在窗体上显示数据

 <Grid>
        <ListView Name="listview" HorizontalAlignment="Left" Height="426" Margin="19,10,0,0" VerticalAlignment="Top" Width="443">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="ID" Width="50" DisplayMemberBinding="{Binding ID}"/>
                    <GridViewColumn Header="Name" Width="50" DisplayMemberBinding="{Binding Name}"/>
                    <GridViewColumn Header="Age" Width="50" DisplayMemberBinding="{Binding Age}"/>
                    <GridViewColumn Header="Sex" Width="50" DisplayMemberBinding="{Binding Sex}"/>                   
                </GridView>
            </ListView.View>
        </ListView>
    </Grid>

namespace WpfApplication2
{
    /// <summary>
    /// Window2.xaml 的交互逻辑
    /// </summary>
    public partial class Window2 : Window
    {
        public Window2()
        {
            InitializeComponent();
            DataTable dt = GreatDataTable();
            for (int i = 0; i < 10; i++)
            {
                DataRow dr = dt.NewRow();
                dr[0] = i;
                dr[1] = "用户" + i;
                dr[2] = 20+i;
                dr[3] = "男";
                dt.Rows.Add(dr);
            }
            this.listview.DataContext = dt;
            this.listview.SetBinding(ListView.ItemsSourceProperty,new Binding());
        }

        public DataTable GreatDataTable()
        {
            DataTable sta = new DataTable("newTable");

            DataColumn[] col = new DataColumn[] { new DataColumn("ID"), new DataColumn("Name"), new DataColumn("Age"), new DataColumn("Sex") };
            sta.Columns.AddRange(col);
            return sta;
        }
    }
}

封装的属性

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace LeiDA
{
    public  class DA : INotifyPropertyChanged
    {
        private string _Name;

        public string Name
        {
            get { return _Name; }
            set { _Name = value; OnPropertyChanged("Name"); }
        }
        private string _Pwd;

        public string Pwd
        {
            get { return _Pwd; }
            set { _Pwd = value; OnPropertyChanged("Pwd"); }
        }

        public DA()
        {
        
        }


        public event PropertyChangedEventHandler PropertyChanged;
        public virtual void OnPropertyChanged(string PropertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
            }
        }

    }
}

2.控件之间的绑定

　　<Grid>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="118,94,0,0" TextWrapping="Wrap" Text="{Binding Path=Value,ElementName=slider,UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Top" Width="120"/>
        <Slider Name="slider" Value="0" HorizontalAlignment="Left" Margin="100,155,0,0" VerticalAlignment="Top" Width="167"/>
    </Grid>

Text="{Binding Path=Value,ElementName=slider,UpdateSourceTrigger=PropertyChanged}"绑定数据的方式，通过ElementName寻找标签，找到Slider标签，绑定了其中的Value属性，
UpdateSourceTrigger表示双向绑定

运行效果

3.WPF命令

　　<Grid>
        <StackPanel Name="spl">
            <Button Name="but" Height="30" Content="发送"></Button>
            <TextBox Name="txtA" Height="60"></TextBox>
        </StackPanel>
    </Grid>

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;

namespace WpfApplication2
{
    /// <summary>
    /// Window4.xaml 的交互逻辑
    /// </summary>
    public partial class Window4 : Window
    {
        //声明并定义命令
        private RoutedCommand rc = new RoutedCommand("Clear", typeof(Window4));
        public Window4()
        {
            InitializeComponent();
            InitializeCommand();
        }
        void InitializeCommand()
        {
            //把命令赋值给命令源,并定义快捷键
            this.but.Command = rc;
            this.rc.InputGestures.Add(new KeyGesture(Key.C, ModifierKeys.Alt));
            //指定命令目标
            but.CommandTarget = txtA;

            //创建命令关联
            CommandBinding commandBinding = new CommandBinding() { Command = rc, };
            commandBinding.CanExecute += commandBinding_CanExecute;
            commandBinding.Executed+=commandBinding_Executed;
            //把命令关联安置在外围控件上
            spl.CommandBindings.Add(commandBinding);
        }
        //当命令到达目标之后，此方法被调用
        private void commandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            txtA.Clear();
            //避免事件继续向上传递而降低程序性能 
            e.Handled = true;
        }
        //当探测命令是否可执行的时候该方法会被调用
        private void commandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            if (string.IsNullOrEmpty(txtA.Text))
            {
                e.CanExecute = false;
            }
            else
            {
                e.CanExecute = true;
            }
            e.Handled = true;
        }

    }
}

运行程序，在TextBox中输入内容之后，Button在命令可执行状态下变为可用，此时单击按钮或者按Alt+C，TextBox就会被清空。运行效果如图：

4.前台改变数值，后台相应改变

 封装属性借用上面的DA类

　　<Grid>
        <TextBox Name="pw" HorizontalAlignment="Left" Height="23" Margin="69,73,0,0" TextWrapping="Wrap" Text="{Binding Pwd}" VerticalAlignment="Top" Width="120"/>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="69,136,0,0" TextWrapping="Wrap" Text="{Binding Text, ElementName=pw, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Top" Width="120"/>
        <Label Content="{Binding Name,Mode=TwoWay}" HorizontalAlignment="Left" Margin="69,39,0,0" VerticalAlignment="Top"/>
        <Button Content="按钮" HorizontalAlignment="Left" Margin="69,195,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click_1"/>
    </Grid>

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 LeiDA;

namespace WpfApplication2
{
    /// <summary>
    /// Window1.xaml 的交互逻辑
    /// </summary>
    
    public partial class Window1 : Window
    {
        DA da;
        public Window1()
        {
            InitializeComponent();
            da = new DA() {Name="adimin",Pwd="123" };
            this.DataContext = da;
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            da.Name = DateTime.Now.ToString("HH:mm:ss:fff");
            da.Pwd = DateTime.Now.ToString("HH:mm:ss");
        }
       
    }
}

运行效果：

 点击按钮后