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>