c# – WPF Datagrid单击行以打开新页面

我的第一篇帖子!新编码!…

我在页面上的框架中有一个WPF数据网格.我想在一行上单击(最好是单击)并使用存储在其中一列中的ID值导航到(打开)一个新页面.

使用MouseDoubleClick有时我可以双击行来打开一个页面.但有时它会抛出:
“program.exe中发生了’System.NullReferenceException’类型的未处理异常
附加信息:对象引用未设置为对象的实例.“

在线(请参阅下面的代码以获取完整方法):

string ID = ((DataRowView)PersonDataGrid.SelectedItem).Row["PersonID"].ToString();

XAML:

<DataGrid x:Name="PersonDataGrid" AutoGenerateColumns="False" 
     SelectionMode="Single" SelectionUnit ="FullRow"      
     MouseDoubleClick="PersonDataGrid_CellClicked"  >
  <DataGrid.Columns>
      <DataGridTextColumn Binding="{Binding Path=PersonID}" 
          ClipboardContentBinding="{x:Null}" Header="ID"  />
  </DataGrid.Columns>
  <DataGrid.CellStyle>
      <Style TargetType="DataGridCell" BasedOn="{StaticResource myDataGridCellStyle}">
           <EventSetter Event="DataGridCell.MouseLeftButtonDown" Handler="PersonDataGrid_CellClicked"/>
      </Style>
   </DataGrid.CellStyle>
</DataGrid>

代码背后:

private void PersonDataGrid_CellClicked(object sender, MouseButtonEventArgs e)

    {
        string ID = ((DataRowView)PersonDataGrid.SelectedItem).Row["PersonID"].ToString();

        SelectedPersonID = Int32.Parse(ID);

        this.NavigationService.Navigate(new PersonProfile());
    }

有没有更好的方法来打开PersonProfile页面?有没有一种简单的方法可以单击一行打开页面?

谢谢.

解决方法:

更好的方法是定义一个定义DataGrid ItemSource的Person集合和一个包含DataGrid中所选Item的Person类型的Property:

 <DataGrid x:Name="PersonDataGrid" AutoGenerateColumns="False" 
            SelectionMode="Single" SelectionUnit ="FullRow"       
            MouseRightButtonUp="PersonDataGrid_CellClicked" 
              ItemsSource="{Binding Persons}" 
              SelectedItem="{Binding SelectedPerson}">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Path=PersonId}" Header="Id"  />
            <DataGridTextColumn Binding="{Binding Path=PersonName}" Header="Name"  />
        </DataGrid.Columns>
    </DataGrid>

并且在本页后面的代码中定义了SelectedPerson和Persons,如下所示:

 public partial class Page1 : Page,INotifyPropertyChanged
{
    private ObservableCollection<Person> _persons ;
    public ObservableCollection<Person> Persons
    {
        get
        {
            return _persons;
        }

        set
        {
            if (_persons == value)
            {
                return;
            }

            _persons = value;
             OnPropertyChanged();
        }
    }

    private Person _selectedPerson ;
    public Person SelectedPerson
    {
        get
        {
            return _selectedPerson;
        }

        set
        {
            if (_selectedPerson == value)
            {
                return;
            }

            _selectedPerson = value;
            OnPropertyChanged();
        }
    }
    public Page1()
    {
        InitializeComponent();
    }

    public event PropertyChangedEventHandler PropertyChanged;
    [NotifyPropertyChangedInvocator]
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
}
public class Person
{
   public int PersonId { get; set; }
   public string PersonName { get; set; }
}

INotifyPropertyChanged用于通知UI属性中的任何更改.
当您在DataGrid中收到MouseRightButtonUp事件时,您可以使用SelectedPerson属性或将其传递给新页面:

    private void PersonDataGrid_CellClicked(object sender, MouseButtonEventArgs e)
    {
        if (SelectedPerson == null)
            return;
        this.NavigationService.Navigate(new PersonProfile(SelectedPerson));
    }

并且您可以更改PersonProfile页面以在其构造函数中接收Person.

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