WPF MVVM COMMOND 传参

一、直接绑定（对于有事件的控件可以通过直接绑定的方式）

1、view


  
   
         <hc:SideMenuItem Header="接谈中" Cursor="Hand" Command="{Binding AddTabItemCommand}" CommandParameter="PDjtList.xaml">   
         <hc:SideMenuItem.Icon>   
         <Image Source="/Images/icons/jtz.png" Width="24" Height="24"/>   
         </hc:SideMenuItem.Icon>   
         </hc:SideMenuItem>

2、viewmodel


  
   
         /// <summary>   
         /// 命令：传递参数   
         /// </summary>   
         public RelayCommand< string> AddTabItemCommand =>   
         new Lazy<RelayCommand< string>>(() =>   
         new RelayCommand< string>(AddTabItem)).Value;   
           
           
         /// <summary>   
         /// 添加新页面   
         /// </summary>   
         /// <param name="param"></param>   
         private void AddTabItem(string param)   
         {   
         string test = param;   
           
           
         }

二、EventTrigger绑定（对于通过datatemp遍历的控件没有事件可以绑定的情况，如listbox）

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"


  
   
         <ListBox Name= "sideMenu" SelectedIndex= "{Binding MenuSelectedIndex}" ItemsSource= "{Binding MenuList}" BorderThickness= "0" SelectionMode= "Single">   
         <ListBox.ItemTemplate>   
         <DataTemplate>   
         <DockPanel Height= "40">   
         <Image Width= "20" Height= "20" Source= "{Binding Icons}"/>   
         <TextBlock Margin= "10,12,0,0" FontSize= "14" Text= "{Binding Title}"/>   
         <TextBox x:Name= "param" Visibility= "Hidden" Text= "{Binding Url}"/>   
         </DockPanel>   
         </DataTemplate>   
         </ListBox.ItemTemplate>   
         <i:Interaction.Triggers>   
         <i:EventTrigger EventName= "SelectionChanged">   
         <command:EventToCommand Command= "{Binding ElementName=sideMenu, Path=DataContext.SelectMenuCommand}" PassEventArgsToCommand= "True" />   
         </i:EventTrigger>   
         </i:Interaction.Triggers>   
         </ListBox>


  
   
         /// <summary>   
         /// 菜单选择事件   
         /// </summary>   
         public RelayCommand<SelectionChangedEventArgs> SelectMenuCommand =>   
         new Lazy<RelayCommand<SelectionChangedEventArgs>>(() =>   
         new RelayCommand<SelectionChangedEventArgs>(SelectMenu)).Value;   
           
         /// <summary>   
         /// 选中菜单打开页面   
         /// </summary>   
         private void SelectMenu(SelectionChangedEventArgs e)   
         {   
         if (e.AddedItems.Count == 0) return;   
         if (e.AddedItems[ 0] is MenuInfo item)   
         {   
         if (Equals(_selectedMenu, item)) return;   
           
         _selectedMenu = item;   
         DataList.Add( new TabControlModel   
         {   
         Header = item.Title,   
         Url = item.Url   
         });   
         TabSelectedIndex = DataList.ToArray().Length - 1;   
           
         }   
         }

三、Image点击事件


  
   
         <Image x:Name= "img_verifycode" Height= "40" Margin= "0,10,30,0" Source= "{Binding VerifyCode}"></Image>   
         <i:Interaction.Triggers>   
         <i:EventTrigger EventName= "MouseLeftButtonDown">   
         <command:EventToCommand Command= "{Binding ElementName=img_verifycode, Path=DataContext.SwitchVerifyCodeCommand}" />   
         </i:EventTrigger>   
         </i:Interaction.Triggers>