WPF ComboBox Command Binding

控件里面有个ComboBox，想要实现ComboBox输入后，输入值可以作为它自己的的Item,这和包含这个ComboBox的控件本身没多大关系........所以想着Command了。

学习了一下，挺好用的。

1、创建WPF 项目,

引用：Microsoft.Expression.Interactivity.DLL，System.Windows.Interactivity；

前台添加： xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

<Window x:Class="ComboBox_Command_Binding.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"        xmlns:viewModel="clr-namespace:ComboBox_Command_Binding.ViewModel"        xmlns:command="clr-namespace:ComboBox_Command_Binding.Command"        Title="MainWindow" Height="350" Width="525" Background="DarkGray">    <Window.Resources>        <viewModel:ViewModes x:Key="view"/>    </Window.Resources>    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">        <ComboBox x:Name="comboBox" Width="200" Height="30" IsEditable="True" VerticalContentAlignment="Center" DataContext="{StaticResource view}">            <i:Interaction.Triggers>                <i:EventTrigger EventName="LostFocus">                    <command:ExecuteCommandAction Command="{Binding Clicked}" CommandParameter="{Binding ElementName=comboBox}"/>                </i:EventTrigger>            </i:Interaction.Triggers>        </ComboBox>        <Button Width="50" Height="30" Margin="5"/>    </StackPanel></Window>

2、ViewModes.cs

using System.Windows.Input;using Microsoft.Expression.Interactivity.Core;namespace ComboBox_Command_Binding.ViewModel{    using System.Windows.Controls;    public class ViewModes    {        public ViewModes()        {            Clicked = new ActionCommand(Click);        }        public ICommand Clicked { get; private set; }        public void Click(object arg)        {            var SS = arg as ComboBox;            if (SS == null || string.IsNullOrWhiteSpace(SS.Text) || SS.Items.Contains(SS.Text)) return;            SS.Items.Add(SS.Text);        }    }}

3、ExecuteCommandAction.cs

using System.Windows.Interactivity;using System.Windows;using System.Windows.Input;using EventTrigger = System.Windows.Interactivity.EventTrigger;namespace ComboBox_Command_Binding.Command{    public class ExecuteCommandAction : TargetedTriggerAction<UIElement>    {        public static readonly DependencyProperty CommandProperty =        DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(ExecuteCommandAction), new FrameworkPropertyMetadata(null));        /// <summary> 命令        /// </summary>        public ICommand Command        {            get { return (ICommand)GetValue(CommandProperty); }            set { SetValue(CommandProperty, value); }        }        public static readonly DependencyProperty CommandParameterProperty =        DependencyProperty.RegisterAttached("CommandParameter", typeof(object), typeof(ExecuteCommandAction), new FrameworkPropertyMetadata(null));        /// <summary> 参数        /// </summary>        public object CommandParameter        {            get { return GetValue(CommandParameterProperty); }            set { SetValue(CommandParameterProperty, value); }        }        /// <summary>由给定的路由事件触发，参数是事件的发送方        /// </summary>        protected override void Invoke(object parameter)        {            if (Command == null) return;            if (Command.CanExecute(CommandParameter))            {                Command.Execute(CommandParameter);            }        }    }}

还有个很不错的文章：http://www.cnblogs.com/matoo/archive/2012/04/14/2447159.html