WPF MVVM COMMOND 传参

原文: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>

原文地址：https://www.cnblogs.com/lonelyxmas/p/12164917.html