Initially I posted this to the PRISM4 forum but got a suggestion that I should try this forum as well:) I m using WPF4 BTW......

I m running PRISM4 and I ve been struggling to get my data binding to work. I m following the MVVM pattern and have a view model which initially loads data from a RDBMS and wraps it in an ICollectionView.This works perfectly, the data is displayed in the bound DatGrid, but I m struggling in my eforts when trying to persist changes made to the data which is presented in a DataGrid declared below.

The view model publishes the ICollectionView through a read/write property, "Results", which, as you can see has a binding mode of "TwoWay". I thought this would be enough to persist the changes made to the state of the checkboxes but no:( I ve experimented with a number of ways to accomplish this but the state of the checkbox is not propagated back to the view model. I ve intercepted the call to the "PlotClicked" method which is an ICommand object but the argument being passed has an unchanged "Plot" attribute! This is especially obvious when I click one of the column headers and the view is sorted - the checked rows are unchecked which is the default state of the checkboxes when retrieved from the db.

我在这里做了什么错误?

Many thanks in advance - I m really stuck here:( /Peter

<DataGrid Grid.Row="0" Name="gridResults" ItemsSource="{Binding Results,Mode=TwoWay}" AutoGenerateColumns="False">
 <DataGrid.Columns>
  <DataGridTemplateColumn Header="Plot">
   <DataGridTemplateColumn.CellTemplate>
    <DataTemplate>
     <CheckBox IsChecked="{Binding Path=Plot, Mode=TwoWay}"
         HorizontalAlignment="Center" 
         Command="{Binding Path=DataContext.PlotClicked,Mode=OneWay, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type DataGrid}}}" 
         CommandParameter="{Binding SelectedItem, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type DataGrid}}}"/>
    </DataTemplate>
   </DataGridTemplateColumn.CellTemplate>
  </DataGridTemplateColumn>

......

我尝试了向我提出的建议。 这是我所做的事:

1. 在图形一中,ICollectionView的复合财产改为OC。

   公共观察 成果{获得;

2. 添加了以下模板资源,用于形成观点的用户群

3. 在“Columns”一节中添加以下代码:

       <DataGridTemplateColumn
           Header="cbTest"
           x:Name="cbTest"
           CellTemplate="{StaticResource IsSelectedColumnTemplate}"
           CellEditingTemplate="{StaticResource IsSelectedColumnTemplateEditing}"
           CanUserSort="True"
           Width="Auto"
           />
   

After having made those changes I experimented with various settings for the UpdateSourceTrigger in the IsChecked="{Binding mentioned...... in (2) above with no effect. The changes I make to the checkboxes are not transferred back to the view-model s ObservableCollection.

同样,许多人感谢我努力帮助我来到这里!

* UPDATE * Now I ve experienced something REALLY SPOOOOKY:( This is what I ve done:

public class ResultViewResult : IReslutViewResult
{
    public bool Plot { get; set; }
    public Guid ResultId { get; set; }
    public DateTime Generated { get; set; }
    public int Duration { get; set; }
    ......

public class ResultViewResult : IReslutViewResult
{
    private bool _plot;
    public bool Plot
    {
        get
        {
            return _plot;
        }
        set
        {
            _plot = value;
        }
    } 
    public Guid ResultId { get; set; }
    public DateTime Generated { get; set; }
    public Guid ResultId { get; set; }
    public DateTime Generated { get; set; }
    public int Duration { get; set; }
    ......

public class ResultViewResult : IReslutViewResult
{
    public bool Plot { get; set; }
    //private bool _plot = false;
    //public bool Plot
    //{
    //    get
    //    {
    //        return _plot;
    //    }
    //    set
    //    {
    //        _plot = value;
    //    }
    //} 
    public Guid ResultId { get; set; }
    public DateTime Generated { get; set; }
    public int Duration { get; set; }
    ......