[英]checkbox in datagrid checked event not trigger wpf mvvm
我的复选框选中事件完全没有触发。 这是我的数据网格代码。 我应该如何在 wpf mvvm 中触发 Checked 事件。
<Window x:Class="EmployeeManager.View.DataGridDownload"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
Title="DataGridDownload" Height="600" Width="790">
<Grid>
<DataGrid HorizontalAlignment="Left" ItemsSource="{Binding TransView}" AutoGenerateColumns="False" Margin="10,62,0,0" VerticalAlignment="Top" Height="497" Width="762">
<DataGrid.Columns>
<DataGridTextColumn Header="caseRefNo" Binding="{Binding caseRefNo}" />
<DataGridTextColumn Header="subjMatr" Binding="{Binding subjMatr}" />
<DataGridTextColumn Header="Download %" Binding="{Binding incValue}" />
<DataGridTemplateColumn>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox
Content="Please Select" IsChecked="{Binding Path=IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked">
<i:InvokeCommandAction Command="{Binding CheckCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</CheckBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Label Content="{Binding incValue,UpdateSourceTrigger=PropertyChanged}" Background="Red" Foreground="White" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
<Label Content="{Binding UpdatePercentage}" HorizontalAlignment="Left" Background="Blue" Foreground="White" Margin="10,10,0,0" VerticalAlignment="Top" Width="338" Height="30">
</Label>
<Button Content="Button" HorizontalAlignment="Left" Margin="672,20,0,0" VerticalAlignment="Top" Width="75"/>
</Grid>
</Window>
这是我的视图模型
public class DataGridDownloadViewModel:BindableBase{
public ObservableCollection<tblTransaction> TransList
{ get; private set; }
public DispatcherTimer dispatchTimer = new DispatcherTimer();
public CollectionView TransView
{ get; private set; }
public DelegateCommand<object> CheckCommand { get; set; }
private String _UpdatePer;
public String UpdatePercentage
{
get { return _UpdatePer; }
set { SetProperty(ref _UpdatePer, value); }
}
private string _caseId;
public string CaseID
{
get { return _caseId; }
set { SetProperty(ref _caseId, value); }
}
private string _isChecked;
public string isChecked
{
get { return _isChecked; }
set { SetProperty(ref _isChecked, value); }
}
private bool CanExecute(object args)
{
return true;
}
private void CheckBoxChecker(object args)
{
//Should Work Here
// Totally not coming to this function
}
public DataGridDownloadViewModel(List<tblTransaction> model)
{
CheckCommand = new DelegateCommand<object>(CheckBoxChecker, CanExecute);
dispatchTimer.Interval = TimeSpan.FromMilliseconds(3000);
dispatchTimer.Tick += dispatchTimer_Tick;
BackGroundThread bgT = Application.Current.Resources["BackGroundThread"] as BackGroundThread;
bgT.GetPercentChanged += (ss, ee) =>
{
UpdatePercentage = bgT.local_percentage.ToString();
};
bgT.GetCaseID += (ss, ee) =>
{
CaseID = bgT.local_caseRef;
};
TransList =new ObservableCollection<tblTransaction>(model);
TransView = GetTransCollectionView(TransList);
TransView.Filter = OnFilterTrans;
var tokenSource = new CancellationTokenSource();
var token = tokenSource.Token;
var cancellationTokenSource = new CancellationTokenSource();
dispatchTimer.Start();
}
private void dispatchTimer_Tick(object sender, EventArgs e)
{
UpdateDataGrid();
}
public void UpdateDataGrid()
{
foreach (tblTransaction tran in TransList)
{
if (tran.caseRefNo == CaseID)
{
tran.incValue = int.Parse(UpdatePercentage);
}
else
{
tran.incValue = tran.incValue;
}
}
TransView.Refresh();
}
bool OnFilterTrans(object item)
{
var trans = (tblTransaction)item;
return true;
}
public CollectionView GetTransCollectionView(ObservableCollection<tblTransaction> tranList)
{
return (CollectionView)CollectionViewSource.GetDefaultView(tranList);
}
}
这是正确的做法吗? 为什么 checkcommand 没有触发?
已编辑
这是我的模型:
public class tblTransaction
{
public string caseRefNo { get;set;}
public string subjMatr { get; set; }
public int incValue { get; set; }
public DateTime? longTime { get; set; }
public bool IsSelected { get; set; }
}
谢谢
下面的代码对我有用,没有像上面的答案那样使用交互库,只需根据您的情况更改Command绑定声明上的AncestorType属性,对我来说,我使用的是UserControl ,在上面的示例中他们使用了Window 。
祝你好运!
<DataGridTemplateColumn Width="auto">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox x:Name="select" HorizontalAlignment="Center"
Command="{Binding DataContext.CheckCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl}}"
IsChecked="{Binding Path=Selected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
</CheckBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
请尝试以下操作:
<i:InvokeCommandAction Command="{Binding DataContext.CheckCommand,
RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}" />
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