如何将参数传递给事件触发器中的方法wpf

Question

其实我试图在Xaml文件的viewModel中存在的方法UpdateWord（object obj）中传递单词文档的名称。所以它会打开word文档。

<Button Content="Show Word" Width="100" Height="25" Margin="128,70,22,37"> 
    <i:Interaction.Triggers> 
      <i:EventTrigger EventName="Click"> 
       <si:CallDataMethod Method="UpdateWord"/>  
       <si:SetProperty TargetName="LayoutRoot" 
     PropertyName="Background" Value="PaleGoldenrod"/> 
    </i:EventTrigger> 
    </i:Interaction.Triggers>   

视图模型：

公共无效UpdateWord（obj对象） {

做点什么......;

}

Answer 1

你可以像这样

<i:EventTrigger EventName="Click"> 
     <cmd:EventToCommand Command="{Binding UpdateWord}" 
      PassEventArgsToCommand="True" /> 
    </i:EventTrigger> 

你可以参考这个职位更多deatil：http://weblogs.asp.net/alexeyzakharov/silverlight-commands-hacks-passing-eventargs-as-commandparameter-to-delegatecommand-triggered-by-eventtrigger

Answer 2

有这样做的多种方法，看here：

1. 使用WPF工具。最简单的

添加命名空间：

• System.Windows.Interactivitiy
• Microsoft.Expression.Interactions

XAML：

<Window> 
    xmlns:wi="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" 
    xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"> 

    <wi:Interaction.Triggers> 
     <wi:EventTrigger EventName="SelectionChanged"> 
      <ei:CallMethodAction 
       TargetObject="{Binding}" 
       MethodName="ShowCustomer"/> 
     </wi:EventTrigger> 
    </wi:Interaction.Triggers> 
</Window> 

代码：

public void ShowCustomer() 
{ 
    // Do something. 
} 

1. 使用MVVMLight。最困难的，但最好的做法

安装GalaSoft NuGet包。

获取的命名空间：

• System.Windows.Interactivity
• GalaSoft.MvvmLight.Platform

XAML

<Window> 
    xmlns:wi="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" 
    xmlns:cmd="http://www.galasoft.ch/mvvmlight"> 

    <wi:Interaction.Triggers> 
     <wi:EventTrigger EventName="Navigated"> 
      <cmd:EventToCommand Command="{Binding NavigatedEvent}" 
       PassEventArgsToCommand="True" /> 
     </wi:EventTrigger> 
    </wi:Interaction.Triggers> 
</Window> 

代码与代表：Source

你必须得到棱镜MVVM NuGet包这一点。

using Microsoft.Practices.Prism.Commands; 

// With params. 
public DelegateCommand<string> CommandOne { get; set; } 
// Without params. 
public DelegateCommand CommandTwo { get; set; } 

public MainWindow() 
{ 
    InitializeComponent(); 

    // Must initialize the DelegateCommands here. 
    CommandOne = new DelegateCommand<string>(executeCommandOne); 
    CommandTwo = new DelegateCommand(executeCommandTwo); 
} 

private void executeCommandOne(string param) 
{ 
    // Do something here. 
} 

private void executeCommandTwo() 
{ 
    // Do something here. 
} 

代码而不DelegateCommand：Source

using GalaSoft.MvvmLight.CommandWpf 

public MainWindow() 
{ 
    InitializeComponent(); 

    CommandOne = new RelayCommand<string>(executeCommandOne); 
    CommandTwo = new RelayCommand(executeCommandTwo); 
} 

public RelayCommand<string> CommandOne { get; set; } 

public RelayCommand CommandTwo { get; set; } 

private void executeCommandOne(string param) 
{ 
    // Do something here. 
} 

private void executeCommandTwo() 
{ 
    // Do something here. 
} 

使用Telerik EventToCommandBehavior。你必须下载它的NuGet Package。这是一个选项。

XAML：

<i:Interaction.Behaviors> 
    <telerek:EventToCommandBehavior 
     Command="{Binding DropCommand}" 
     Event="Drop" 
     PassArguments="True" /> 
</i:Interaction.Behaviors> 

代码：

public ActionCommand<DragEventArgs> DropCommand { get; private set; } 

this.DropCommand = new ActionCommand<DragEventArgs>(OnDrop); 

private void OnDrop(DragEventArgs e) 
{ 
    // Do Something 
}