WPF DataGrid 列:如何管理值更改事件 [英] WPF DataGrid columns: how to manage event of value changing

问题描述

在我的 WPF C# 项目中，我有一个 Datagrid，如下所示:

In my WPF C# project, I have a Datagrid as follows:

<DataGrid x:Name="FixedPositionDataGrid" HorizontalAlignment="Left" Margin="33,229,0,0" VerticalAlignment="Top" Width="172" Height="128" AutoGenerateColumns="False" FontSize="10" CanUserAddRows="False">
        <DataGrid.Columns>
            <DataGridTextColumn Header="indice" Binding="{Binding index}" IsReadOnly="True"/>
            <DataGridTextColumn Header="%" Binding="{Binding percentage}" />                                    
            <DataGridComboBoxColumn x:Name="DataGridComboBoxColumnAlignment" Header="Allineamento barre" SelectedValueBinding="{Binding alignment}"/>
        </DataGrid.Columns>
    </DataGrid>

我需要一个事件来管理第二列和第三列中的值变化(即%"和Allineamento barre").不需要插入的值，我只需要在更改其中一个值时引发一个事件.我该如何执行?我需要定义事件方法的方法，我可以在其中定义一些操作.我读过这个 如何在 wpf 数据网格的单元格中的值使用 MVVM 更改时引发事件? 但我没有链接到数据网格的可观察集合.

I need to have an event that manages the value changing in second and third columns (that is "%" and "Allineamento barre"). No need about the value inserted, I just need to raise an event when one of values are changed. How can I perform it? I need the way to define the event method in which I can define some operations to do. I've read this how to raise an event when a value in a cell of a wpf datagrid changes using MVVM? but I don't have an observable collection linked to datagrid.

Datagrid ItemSource 与以下对象链接:

The Datagrid ItemSource is linked with the following objects:

public class FixedPosition
{
    [XmlAttribute]
    public int index { get; set; }

    public int percentage { get; set; }
    public HorizontalAlignment alignment { get; set; }        
}

如何修改才能得到预期的结果?

How can I modify it to obtain the result expected?

谢谢

推荐答案

您似乎从 WinForms 的角度看待这个问题.在 WPF 中，我们通常更喜欢操作数据对象而不是 UI 对象.你说你的项目没有 ObservableCollection，但我建议你使用一个.

You seem to be looking at this problem from a WinForms perspective. In WPF, we generally prefer to manipulate data objects rather than UI objects. You said that don't have an ObservableCollection<T> for your items, but I would recommend that you use one.

如果您的数据没有数据类型类，那么我建议您创建一个.然后，您应该在其中实现 INotifyPropertyChanged 接口.

If you don't have a data type class for your data, then I'd advise you to create one. You should then implement the INotifyPropertyChanged interface in it.

执行此操作并将您的集合属性设置为 DataGrid 的 ItemsSource 后，您需要做的就是附加一个 INotifyPropertyChanged处理您选择的数据类型:

After doing this and setting your collection property as the ItemsSource of your DataGrid, then all you need to do is to attach an INotifyPropertyChanged handler to your selected data type:

在视图模型中:

public ObservableCollection<YourDataType> Items
{
    get { return items; }
    set { items = value; NotifyPropertyChanged("Items"); }
}

public YourDataType SelectedItem
{
    get { return selectedItem; }
    set { selectedItem = value; NotifyPropertyChanged("SelectedItem"); }
}

在视图模型构造函数中:

In the view model constructor:

SelectedItem.PropertyChanged += SelectedItem_PropertyChanged;

在视图模型中:

private void SelectedItem_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    // this will be called when any property value of the SelectedItem object changes
    if (e.PropertyName == "YourPropertyName") DoSomethingHere();
    else if (e.PropertyName == "OtherPropertyName") DoSomethingElse();
}

在用户界面中:

<DataGrid ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" ... />

这篇关于WPF DataGrid 列:如何管理值更改事件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！