理解Prism中MVVM的Command与CommandParameter
理解Prism中MVVM的Command与CommandParameter
内容摘要
接上一讲( http://www.cnblogs.com/chenxizhang/archive/2012/04/13/2446415.html ),这一讲中我使用Prism做了演示和比较。Prism不仅仅是一个MVVM框架,它还包含其他的模块。在MVVM这个层面,Prism有些特殊性(Command绑定有特殊语法),这也是我这一讲的主要内容。
Prism的下载链接
http://compositewpf.codeplex.com/
视频地址
http://www.tudou.com/programs/view/72Ag1kQt1RA/
示例代码
< Window x:Class ="WPFPrismMvvm.MainWindow" xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml" Title ="MainWindow" Height ="350" xmlns:local ="clr-namespace:WPFPrismMvvm" xmlns:cmd ="clr-namespace:Microsoft.Practices.Prism.Commands;assembly=Microsoft.Practices.Prism" Width ="525" > < Window.DataContext > < local:MainWindowViewModel UserName ="chenxizhang" ></ local:MainWindowViewModel > </ Window.DataContext > < Grid > < StackPanel > < TextBox Text ="{Binding UserName,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" ></ TextBox > < Button Content ="Show" cmd:Click . Command ="{Binding ShowCommand}" cmd:Click . CommandParameter ="{Binding UserName}" ></ Button > </ StackPanel > </ Grid > </ Window >
using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Practices.Prism.ViewModel; using Microsoft.Practices.Prism.Commands; using System.Windows.Input; using System.Windows; namespace WPFPrismMvvm { public class MainWindowViewModel:NotificationObject { private string _UserName; public string UserName { get { return _UserName; } set { if (_UserName != value ) { _UserName = value ; RaisePropertyChanged( "UserName" ); } } } public ICommand ShowCommand { get { return new DelegateCommand< string >( (user) => { MessageBox.Show(user); }, (user) => { return ! string .IsNullOrEmpty(user); }); } } } }
分类: fmplan-02 - Developement Practice-02-1-Desktop
作者: Leo_wl
出处: http://www.cnblogs.com/Leo_wl/
本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。
版权信息查看更多关于理解Prism中MVVM的Command与CommandParameter的详细内容...
声明:本文来自网络,不代表【好得很程序员自学网】立场,转载请注明出处:http://www.haodehen.cn/did49343