WPF的DataGrid单元格的值更改事件 [英] WPF DataGrid cell value changed event

问题描述

我有一个设置，看起来像这样：

  // mydg中的一个DataGrid的列DataGridTextColumn 
的ObservableCollection< MyItem> MYOC; 
 // MYOC中填充了一些新的MyItem 
 myDG.ItemsSource = MYOC; 
  

其中， MyItem 工具 INotifyPropertyChanged的。什么时候的用户的输入一个值单元格中正确捕捉方法是什么？

我试着追赶的PropertyChanged 在 MyItem S，但我周期性的背景也更新值（这个想法是，当用户手动编辑的值，一个标志被触发，它告诉定期计算，以避免覆盖手动输入的数据）。因此，的PropertyChanged 捕捉一切，包括定期更新，这是我不想要的。我想这可能使这项工作（通过设置当我做定期计算一个标志，那么检查的PropertyChanged事件处理程序不在标志的 - 但我想知道如果有一个简单的解决方案。）

我试着追赶 myDG.CurrentCellChanged 但是这触发每次用户改变小区选择，没有特别当他们编辑的单元格内容的时间

编辑：这里是XAML：

 <数据网格X：NAME =mydg中的ItemsSource ={}绑定的AutoGenerateColumns =FALSE保证金=10,10,182,0VerticalAlignment =评出的HEIGHT =329ClipboardCopyMode =IncludeHeader> 
< DataGrid.Columns> 
< DataGridTextColumn标题=COL1绑定={结合为prop1}IsReadOnly =真/> 
< DataGridTextColumn标题=col2的绑定={结合Prop2}IsReadOnly =FALSE/> 
< /DataGrid.Columns> 
< / DataGrid的> 
  

下面是 MyItem 执行（使用< A HREF =https://github.com/Fody/PropertyChanged相对=nofollow> Fody / PropertyChanged的）：

  [ImplementPropertyChanged] 
类MyItem：INotifyPropertyChanged的
 {
公共事件PropertyChangedEventHandler的PropertyChanged; 
 
公共字符串为prop1 {搞定;组; } 
公共字符串Prop2 {搞定;组; } 
 
公共MyItem（）
 {
为prop1 = Prop2 =; 
} 
} 
  

解决方案

的解决方案是赶 CellEditEnding 事件。

  //初始化中
 myDG.CellEditEnding + = myDG_CellEditEnding; 
 
无效myDG_CellEditEnding（对象发件人，DataGridCellEditEndingEventArgs E）
 {
如果（e.EditAction == DataGridEditAction.Commit）
 {
柱VAR = E .Column为DataGridBoundColumn; 
如果（列！= NULL）
 {
 VAR bindingPath =（column.Binding为绑定）.Path.Path; 
如果（bindingPath ==col2的）
 {
 INT的rowIndex = e.Row.GetIndex（）; 
 VAR EL = e.EditingElement为文本框; 
 // rowIndex位置有行索引
 // bindingPath有柱的结合
 // el.Text有新的，用户输入的值
} 
 $} b $ b} 
} 
  

I have a setup that looks like this:

// myDG is a DataGrid whose columns are DataGridTextColumn
ObservableCollection<MyItem> myOC;
// myOC is populated with some new MyItem
myDG.ItemsSource = myOC;

where MyItem implements INotifyPropertyChanged. What's the way to properly catch when the user inputs a value into a cell?

I've tried catching PropertyChanged on the MyItems, but I also update the values periodically in the background (the idea is that when the user manually edits the value, a flag is triggered that tells the periodic calculation to avoid overwriting the manually entered data). So PropertyChanged catches everything, including the periodic updates, which I don't want. I suppose it's possible to make this work (by setting a flag when I do the periodic calculation, then checking for absence of flag on the PropertyChanged event handler -- but I want to know if there's a simpler solution.)

I've tried catching myDG.CurrentCellChanged but that's triggered every time the user changes the cell selection, not specifically when they edit cell contents.

Edit: Here is the XAML:

<DataGrid x:Name="myDG" ItemsSource="{Binding}" AutoGenerateColumns="False" Margin="10,10,182,0" VerticalAlignment="Top" Height="329" ClipboardCopyMode="IncludeHeader">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Col1" Binding="{Binding Prop1}" IsReadOnly="True"/>
        <DataGridTextColumn Header="Col2" Binding="{Binding Prop2}" IsReadOnly="False"/>
    </DataGrid.Columns>
</DataGrid>

Here is the MyItem implementation (uses Fody/PropertyChanged):

[ImplementPropertyChanged]
class MyItem : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public string Prop1 { get; set; }
    public string Prop2 { get; set; }

    public MyItem()
    {
        Prop1 = Prop2 = "";
    }
}

解决方案

The solution was to catch the CellEditEnding event.

// In initialization
myDG.CellEditEnding += myDG_CellEditEnding;

void myDG_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
    if (e.EditAction == DataGridEditAction.Commit)
    {
        var column = e.Column as DataGridBoundColumn;
        if (column != null)
        {
            var bindingPath = (column.Binding as Binding).Path.Path;
            if (bindingPath == "Col2")
            {
                int rowIndex = e.Row.GetIndex();
                var el = e.EditingElement as TextBox;
                // rowIndex has the row index
                // bindingPath has the column's binding
                // el.Text has the new, user-entered value
            }
        }
    }
}

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