问题描述
我在WPF编程MVVM模式新。现在，我已经添加在DataGrid的上下文菜单。但是，当我点击鼠标右键，我不知道怎么去选择行值。
这是我的同时，车桥零部件
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>
和这里是我的ViewModel
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]
非常感谢你。
推荐答案
这是WPF中一个常见的问题。解决的办法是利用标签属性的项目的DataTemplate 来保存数据项。首先，让我们添加这一部分：
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>
现在，我们有机会获得的DataContext 的用户控件可在<$ C $找到C>标签每个数据对象的属性，我们将绑定到这个从文本菜单 ...我们使用一个被称为方便属性为 PlacementTarget ：
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>
有一点要注意的是在 CommandParameter 上面显示的 YourCollection.CurrentItem 属性。在 CURRENTITEM 属性是我添加到我的收藏类绑定到集控的的SelectedItem 属性属性UI。如果你没有这些中的一个，它的确定，但你的将会的需要绑定到您的收藏控制的的SelectedItem 两个属性这个工作。在我的例子，我有这样的：
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}" />
这篇关于添加上下文菜单DataGrid中，如何让选择项目价值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！