将事件绑定到ViewModel [英] Bind event to ViewModel

问题描述

我正在为我的应用程序使用WPF和PRISM框架。我使用的模式是MVVM（Model - View - ViewModel），我试图将MouseLeftButtonUp事件从View中的代码隐藏到ViewModel中（因此事件将根据MVVM规则）。现在我有这个：

View.xaml：

  ; DataGrid x：Name =employeeGridHeight =250Margin =25,0,10,0ItemsSource ={Binding DetacheringenEmployeesModel}IsReadOnly =TrueColumnHeaderStyle ={DynamicResource CustomColumnHeader}AutoGenerateColumns =False RowHeight =30> 
< i：Interaction.Triggers> 
< i：EventTrigger EventName =MouseLeftButtonUp> 
< i：InvokeCommandAction Command ={Binding EmployeeGrid_MouseLeftButtonUp}/> 
< / i：EventTrigger> 
< / i：Interaction.Triggers> 
< DataGrid.Columns> 
  

View.xaml.cs（代码隐藏）：

  public partial class UC1001_DashBoardConsultants_View 
 {
 public UC1001_DashBoardConsultants_View（UC1001_DashboardConsultantViewModel viewModel）
 {
 InitializeComponent（）; 
 DataContext = viewModel; 
} 
} 
  

ViewModel.cs：

  public void EmployeeGrid_MouseLeftButtonUp（object sender，MouseButtonEventArgs e）
 {
 // insert logic here 
} 
  

主要想法是，当我点击DataGrid中的单元格时，事件将触发。我第一次尝试在代码背后，它的工作。事情触发器到目前为止，但是当我调试并单击一个单元格时，我的调试器不会进入该方法。

有没有人知道如何解决这个问题？感谢提前！

PS：当我这样做时，它是否也可以使用（object sender）参数？因为我需要ViewModel中的DataGrid来获取我刚刚点击的ActiveCell。

编辑：

事件绑定与Command一起工作！

我在我的DataGrid中有这样的功能：

 < DataGridTextColumn Header =OktWidth =*x：Name =test> 
< DataGridTextColumn.ElementStyle> 
< Style TargetType ={x：Type TextBlock}> 
< Setter Property =TagValue ={Binding Months [9] .AgreementID}/> 
  

如何将Tag属性绑定到ViewModel？我知道它已经从ViewModel绑定了，但是你可以看到这个值来自一个Array / List和每个列的值是不同的。

解决方案

InvokeCommandAction 需要将 ICommand 绑定到事件处理程序如你所绑定（EmployeeGrid_MouseLeftButtonUp）。

所以你可以在ViewModel中引入一个命令并绑定到它：

查看模型

  public ICommand SomeActionCommand {get;组; 
  

XAML：

 < i：InvokeCommandAction Command ={Binding SomeActionCommand}/> 
  

I am using WPF and PRISM framework for my application. The pattern I am using is MVVM (Model - View - ViewModel) and I am trying to bring the MouseLeftButtonUp event from the code-behind in the View to the ViewModel (so the event will be according the MVVM rules). For now I have this:

View.xaml:

<DataGrid x:Name="employeeGrid" Height="250" Margin="25,0,10,0" ItemsSource="{Binding DetacheringenEmployeesModel}" IsReadOnly="True" ColumnHeaderStyle="{DynamicResource CustomColumnHeader}" AutoGenerateColumns="False" RowHeight="30">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseLeftButtonUp">
                 <i:InvokeCommandAction Command="{Binding EmployeeGrid_MouseLeftButtonUp}" />
            </i:EventTrigger>
        </i:Interaction.Triggers>
<DataGrid.Columns>

View.xaml.cs (code-behind):

public partial class UC1001_DashBoardConsultants_View
{
    public UC1001_DashBoardConsultants_View(UC1001_DashboardConsultantViewModel viewModel)
    {
            InitializeComponent();
            DataContext = viewModel;
    }
}

ViewModel.cs:

 public void EmployeeGrid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
 {
     // insert logic here
 }

The main idea is, when I click on a cell in the DataGrid, the event will fire. I first tried it in the code behind, and it worked. I got so far with the EventTriggers, but when I debug and click on a cell, my debugger doesn't come into the method.

Does anyone have an idea how to fix this? Thanks in advance!

PS: Does it also work with the (object sender) parameter when I do it like that? Because I need the DataGrid in my ViewModel to get the ActiveCell I just clicked on.

EDIT:

The event-binding worked with the Command!

I have this in my DataGrid:

<DataGridTextColumn Header="Okt" Width="*" x:Name="test" >
     <DataGridTextColumn.ElementStyle>
           <Style TargetType="{x:Type TextBlock}">
             <Setter Property="Tag" Value="{Binding Months[9].AgreementID}"/>

How can I bind the Tag property to the ViewModel? I know it's already bound from the ViewModel, but as you can see the value comes from an Array/List and per column the value is different.

解决方案

InvokeCommandAction requires the ICommand to be bound not an event handler as you've bound (EmployeeGrid_MouseLeftButtonUp).

So you can introduce a command in ViewModel and bind to it:

View Model:

public ICommand SomeActionCommand { get; set; }

XAML:

<i:InvokeCommandAction Command="{Binding SomeActionCommand}" />

这篇关于将事件绑定到ViewModel的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！