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理解Prism中MVVM的Command与CommandParameter

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。

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