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我的問題：如何將SelectedItem從主數據網格綁定到輔助數據網格的ItemsSource？有關Silverlight的兩個Datagrids
詳細內容： 我在我的視圖中有兩個datagrid。第一個顯示了一組球隊，第二個顯示了選定球隊中的人員名單。
當我從網格中選擇一個團隊時，我可以看到SelectedTeam屬性正在正確更新，但人員網格未獲取填充。
注意：我無法使用嵌套網格或SL數據網格中提供的冷卻主控細節功能。
更新：用ComboBox代替父DataGrid給出了完全不同的結果，並且完美地工作。 爲什麼ComboBox.SelectedItem和DataGrid.SelectedItem行爲如此不同？
謝謝，
馬克
簡單攝製：
VIEW：
<UserControl x:Class="NestedDataGrid.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data">
<StackPanel x:Name="LayoutRoot">
<TextBlock Text="Teams:" />
<data:DataGrid ItemsSource="{Binding Teams}"
SelectedItem="{Binding SelectedTeam, Mode=TwoWay}"
AutoGenerateColumns="False">
<data:DataGrid.Columns>
<data:DataGridTextColumn Header="Id" Binding="{Binding TeamId}" />
<data:DataGridTextColumn Header="Desc" Binding="{Binding TeamDesc}" />
</data:DataGrid.Columns>
</data:DataGrid>
<TextBlock Text="Peeps:" />
<data:DataGrid ItemsSource="{Binding SelectedTeam.People}"
AutoGenerateColumns="False">
<data:DataGrid.Columns>
<data:DataGridTextColumn Header="Id"
Binding="{Binding PersonId}" />
<data:DataGridTextColumn Header="Name"
Binding="{Binding Name}" />
</data:DataGrid.Columns>
</data:DataGrid>
</StackPanel>
</UserControl>
CODE_BEHIND：
using System.Windows.Controls;
namespace NestedDataGrid
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
this.LayoutRoot.DataContext = new ViewModel();
}
}
}
視圖模型：
using System.Collections.ObjectModel;
namespace NestedDataGrid
{
public class ViewModel: ObjectBase
{
public ViewModel()
{
ObservableCollection<Person> RainbowPeeps = new ObservableCollection<Person>()
{
new Person(){ PersonId=1, Name="George"},
new Person(){ PersonId=2, Name="Zippy"},
new Person(){ PersonId=3, Name="Bungle"},
};
ObservableCollection<Person> Simpsons = new ObservableCollection<Person>()
{
new Person(){ PersonId=4, Name="Moe"},
new Person(){ PersonId=5, Name="Barney"},
new Person(){ PersonId=6, Name="Selma"},
};
ObservableCollection<Person> FamilyGuyKids = new ObservableCollection<Person>()
{
new Person(){ PersonId=7, Name="Stewie"},
new Person(){ PersonId=8, Name="Meg"},
new Person(){ PersonId=9, Name="Chris"},
};
Teams = new ObservableCollection<Team>()
{
new Team(){ TeamId=1, TeamDesc="Rainbow", People=RainbowPeeps},
new Team(){ TeamId=2, TeamDesc="Simpsons", People=Simpsons},
new Team(){ TeamId=3, TeamDesc="Family Guys", People=FamilyGuyKids },
};
}
private ObservableCollection<Team> _teams;
public ObservableCollection<Team> Teams
{
get { return _teams; }
set
{
SetValue(ref _teams, value, "Teams");
}
}
private Team _selectedTeam;
public Team SelectedTeam
{
get { return _selectedTeam; }
set
{
SetValue(ref _selectedTeam, value, "SelectedTeam");
}
}
}
}
相關的類：
using System;
using System.ComponentModel;
namespace NestedDataGrid
{
public abstract class ObjectBase : Object, INotifyPropertyChanged
{
public ObjectBase()
{ }
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void _OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler pceh = PropertyChanged;
if (pceh != null)
{
pceh(this, new PropertyChangedEventArgs(propertyName));
}
}
protected virtual bool SetValue<T>(ref T target, T value, string propertyName)
{
if (Object.Equals(target, value))
{
return false;
}
target = value;
_OnPropertyChanged(propertyName);
return true;
}
}
public class Person: ObjectBase
{
private int _personId;
public int PersonId
{
get { return _personId; }
set
{
SetValue(ref _personId, value, "PersonId");
}
}
private string _name;
public string Name
{
get { return _name; }
set
{
SetValue(ref _name, value, "Name");
}
}
}
public class Team : ObjectBase
{
private int _teamId;
public int TeamId
{
get { return _teamId; }
set
{
SetValue(ref _teamId, value, "TeamId");
}
}
private string _teamDesc;
public string TeamDesc
{
get { return _teamDesc; }
set
{
SetValue(ref _teamDesc, value, "TeamDesc");
}
}
private ObservableCollection<Person> _people;
public ObservableCollection<Person> People
{
get { return _people; }
set
{
SetValue(ref _people, value, "People");
}
}
}
}
UPDATE
與組合框的更換第一個DataGrid和eveything工程確定。爲什麼DataGrid.SelectedItem和ComboBox.SelectedItem行爲如此不同？
<StackPanel x:Name="LayoutRoot">
<TextBlock Text="Teams:" />
<ComboBox SelectedItem="{Binding SelectedTeam, Mode=TwoWay}"
ItemsSource="{Binding Teams}"/>
<TextBlock Text="{Binding SelectedTeam}" />
<TextBlock Text="Peeps:" />
<data:DataGrid ItemsSource="{Binding SelectedTeam.People}" />
</StackPanel>
我們可以假設在第二格的綁定errorneous名稱是一個錯字？ – AnthonyWJones 2009-12-01 15:06:16
是的 - 對不起。參考文獻已更新。 – 2009-12-01 15:13:32