如何将参数传递给事件触发器 wpf 中存在的方法 [英] how to pass argument to the method present in event trigger wpf

问题描述

实际上，我试图在 Xaml 文件的 ViewModel 中存在的方法 UpdateWord(object obj) 中传递 word 文档的名称.这样它就会打开word文档.

<i:Interaction.Triggers><i:EventTrigger EventName="点击"><si:CallDataMethod Method="UpdateWord"/><si:SetProperty TargetName="LayoutRoot"PropertyName="Background" Value="PaleGoldenrod"/></i:EventTrigger></i:Interaction.Triggers>

视图模型:

public void UpdateWord(Object obj){//做点什么 ..... ;}

解决方案

有多种方法可以做到这一点，看

使用 GalaSoft.MvvmLight.CommandWpf公共主窗口(){初始化组件();CommandOne = new RelayCommand(executeCommandOne);CommandTwo = new RelayCommand(executeCommandTwo);}public RelayCommandCommandOne { 得到;放;}public RelayCommand CommandTwo { get;放;}私有无效executeCommandOne(字符串参数){//在这里做点什么.}私有无效executeCommandTwo(){//在这里做点什么.}

3. 使用 Telerik EventToCommandBehavior.您必须下载它 NuGet 包.这是一个选项.

XAML:

<telerek:EventToCommandBehavior命令="{绑定 DropCommand}"事件="掉落"PassArguments="True"/></i:Interaction.Behaviors>

代码:

public ActionCommandDropCommand { 得到;私人订制；}this.DropCommand = new ActionCommand(OnDrop);私有无效 OnDrop(DragEventArgs e){//做点什么}

Actually, I'm trying to pass the name of the word document in the method UpdateWord(object obj) present in the ViewModel of the Xaml file. So that it will open the word document.

<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>          

ViewModel :

public void UpdateWord(Object obj)
{

   //Do Something ..... ;
}

解决方案

There are multiple ways of doing this, look here:

1. Using WPF Tools. Easiest

Add Namespaces:

• 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>

Code:

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

2. Using MVVMLight. Most difficult but best practice

Install GalaSoft NuGet package.

Get the namespaces:

• 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>

Code With Delegates: Source

You must get the Prism MVVM NuGet package for this.

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.
}

Code Without 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.
}

3. Using Telerik EventToCommandBehavior. You'll have to download it's NuGet Package. It's an option.

XAML:

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

Code:

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

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

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

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