I am new in WPF programming with MVVM pattern. Now I have added the context menu in the datagrid. But, when I click the right mouse button, I don't know how to get the select row value. this is my xmal
<DataGrid AutoGenerateColumns="False" Grid.Row="1" CanUserAddRows="False" CanUserDeleteRows="False"
ItemsSource="{Binding StoryList}">
<DataGrid.Columns>
<DataGridTextColumn Header="ID" Binding="{Binding ID}" Width="40" IsReadOnly="True" />
<DataGridTextColumn Header="Title" Binding="{Binding Title}" Width="60" IsReadOnly="True"/>
<DataGridTextColumn Header="StoryPoints" Binding="{Binding StoryPoints}" Width="90" IsReadOnly="True">
<DataGridTextColumn.CellStyle>
<Style TargetType="DataGridCell">
<Style.Triggers>
<DataTrigger Binding="{Binding StoryPoints}" Value="0">
<Setter Property="Background" Value="Red"/>
<Setter Property="ToolTip" Value="Story Point cannot be 0."/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGridTextColumn.CellStyle>
</DataGridTextColumn>
<DataGridTextColumn Header="Stack Rank" Binding="{Binding StackRank}" Width="80"/>
<DataGridTextColumn Header="Estimate" Binding="{Binding Estimate}" Width="60"/>
<DataGridTextColumn Header="CompletedWork" Binding="{Binding CompletedWork}" Width="120" />
<DataGridTextColumn Header="RemainWork" Binding="{Binding RemainWork}" Width="110" />
<DataGridTextColumn Header="CompleteProcess" Binding="{Binding CompletedProcess}" Width="110" />
<DataGridTextColumn Header="YesterdayComments" Binding="{Binding YesterdayComments}" Width="120" />
<DataGridTextColumn Header="TodayComments" Binding="{Binding TodayComments}" Width="120" />
</DataGrid.Columns>
<DataGrid.ContextMenu>
<ContextMenu Name="StoryMenu" StaysOpen="True">
<MenuItem Header="Add an Issue" Command="{Binding AddIssueCommand}" />
<MenuItem Header="Burn Down Chart" Command="{Binding BurnDownChartCommand}"/>
</ContextMenu>
</DataGrid.ContextMenu>
</DataGrid>
And here is my viewModel
class MainViewModel:NotificationObject
{
private ObservableCollection<Story> storyList;
public ObservableCollection<Story> StoryList
{
get { return storyList; }
set
{
storyList = value;
this.RaisePropertyChanged("StoryList");
}
}
public DelegateCommand AddIssueCommand { get; set; }
public DelegateCommand BurnDownChartCommand { get; set; }
private Story selectStory;
public Story SelectStory
{
get { return selectStory; }
set
{
selectStory = value;
this.RaisePropertyChanged("SelectStory");
}
}
public void LoadStory()
{
this.storyList = new ObservableCollection<Story>();
Story story1 = new Story(){ID=1, Title="win App", StoryPoints=0, StackRank=1, Estimate=40, CompletedWork=10, RemainWork=30, CompletedProcess=25, TodayComments="Coding", YesterdayComments="N/a"};
Story story2 = new Story() { ID = 2, Title = "win App", StoryPoints = 10, Estimate = 40, CompletedWork = 10, RemainWork = 30, CompletedProcess = 25, TodayComments = "Coding 20%", YesterdayComments = "N/a" };
Story story3 = new Story() { ID = 3, Title = "win App", StoryPoints = 10, Estimate = 50, CompletedWork = 20, RemainWork = 30, CompletedProcess = 20, TodayComments = "Coding 30%", YesterdayComments = "N/a" };
Story story4 = new Story() { ID = 4, Title = "win App", StoryPoints = 10, Estimate = 60, CompletedWork = 30, RemainWork = 30, CompletedProcess = 50, TodayComments = "Coding 40%", YesterdayComments = "N/a" };
Story story5 = new Story() { ID = 5, Title = "win App", StoryPoints = 10, Estimate = 40, CompletedWork = 10, RemainWork = 30, CompletedProcess = 25, TodayComments = "Coding 50%", YesterdayComments = "N/a" };
Story story6 = new Story() { ID = 6, Title = "win App", StoryPoints = 10, Estimate = 30, CompletedWork = 30, RemainWork = 0, CompletedProcess = 100, TodayComments = "Coding 60%", YesterdayComments = "N/a" };
storyList.Add(story1);
storyList.Add(story3);
storyList.Add(story2);
storyList.Add(story4);
storyList.Add(story5);
storyList.Add(story6);
}
public MainViewModel()
{
this.SelectStory = new Story();
this.LoadStory();
this.AddIssueCommand = new DelegateCommand(new Action(this.AddIssueCommandExecute));
}
public void AddIssueCommandExecute()
{
if (SelectStory != null)
{
System.Windows.MessageBox.Show("Add an Issue" + SelectStory.Title + "!");
}
else
{
System.Windows.MessageBox.Show("choose an story first!");
}
//System.Windows.MessageBox.Show("record" + RecordIndex);
}
}![What I need][1]
Thank you very much
This is a common problem in WPF. The solution is to utilise a Tag property in the item DataTemplate to hold the data item. First, let's add this part:
<DataTemplate DataType="{x:Type YourDataTypeXmlNamespace:YourDataType}">
<Border Tag="{Binding DataContext, RelativeSource={RelativeSource AncestorType={
x:Type YourViewsXmlNamespace:YourViewWhereThisIsDeclared}}}">
...
</Border>
</DataTemplate>
Now that we have access to the DataContext of the UserControl which can be found in the Tag property of each data object, let's bind to this from the ContextMenu... we do it using a handy property called PlacementTarget:
<ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={
RelativeSource Self}}">
<MenuItem Header="Do Something" Command="{Binding YourCommandInYourViewModel}"
CommandParameter="{Binding YourCollection.CurrentItem}">
...
</MenuItem>
</ContextMenu>
One thing to note is the YourCollection.CurrentItem property shown in the CommandParameter above. The CurrentItem property is a property that I added into my collection classes to bind to the SelectedItem properties of collection controls in the UI. If you don't have one of these, it's ok, but you will need a property that is bound to the SelectedItem property of your collection control for this to work. For my example, I have this:
<ListBox ItemsSource="{Binding YourCollection}" SelectedItem="{Binding
YourCollection.CurrentItem}" />