PropertyChangedEventHandler PropertyChanged;
2.3ComboBox数据源更改后默认显示空值
ComboBox数据源更新后会执行一遍SelectionChanged事件，这时返回的SelectedIndex为-1，SelectedItem也是null；
解决方法：手动绑定SelectedIndex或SelectedItem值实现跟随数据源变化而变化（需要ComboBox数据源每项必须存在一个是否被选中的属性），我这边用的SelectedIndex。
自定义ComboxSelIndexConverter会在下面cs中贴出。
在window标签中加入：
xmlns:ValueConverter="clr-namespace:WpfTempleate.Converts"
在Window.Resources中加入：
<Window.Resources>
<ValueConverter:ComboxSelIndexConverter x:Key="ComboxSelIndexConverter"/>
</Window.Resources>
ComboBox中加入：
SelectedIndex="{Binding ItemList,Converter={StaticResource ComboxSelIndexConverter},Mode=OneWay}"
对应的Class->ComboxSelIndexConverter.cs在下面贴出。
3.描述：
xaml->DataGrid
ItemsSource="{Binding People,ElementName=root}"
其中root是当前页面的name值，绑定上下文为当前页面对象，相当于DataContext="{Binding ElementName=root}"
People是DataGrid绑定的数据源(集合)
xaml->ComboBox
ItemsSource="{Binding ItemList,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
其中ItemList是ComboBox绑定的数据源（集合）
其中UpdateSourceTrigger=PropertyChanged是表示ComboBox发生变化时触发更新数据源
xaml：
<DataGrid Width="500" Height="400" x:Name="dataGrid"
ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Visible"
HorizontalScrollBarVisibility="Visible"
ItemsSource="{Binding People,ElementName=root}"
GridLinesVisibility="All"
BorderThickness="1,1,2,1"
CanUserDeleteRows="False"
CanUserAddRows="False"
AutoGenerateColumns="False"
EnableRowVirtualization="False">
<DataGrid.Columns>
<DataGridTemplateColumn Header="Operation" IsReadOnly="True" x:Name="abc" >
<DataGridTemplateColumn.CellTemplate>
<DataTemplate >
<StackPanel Orientation="Horizontal">
<ComboBox x:Name="comList"
IsReadOnly="True"
IsEditable="True"
Tag="{Binding ID}"
HorizontalContentAlignment="Center"
SelectionChanged="ComboBox_SelectionChanged"
DisplayMemberPath="Name"
SelectedValuePath="Value"
SelectedIndex="{Binding ItemList,Converter={StaticResource ComboxSelIndexConverter},Mode=OneWay}"
ItemsSource="{Binding ItemList,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
</ComboBox>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
ComboxSelIndexConverter.cs
public class ComboxSelIndexConverter : IValueConverter
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
var abcs = (ObservableCollection<ABC>)value;
if (abcs == null)
return -1;
if (abcs.Count == 0)
return -1;
var abc = abcs.FirstOrDefault(f => f.Des == "1");
if (abc != null)
return abcs.IndexOf(abc);
return -1;
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
throw new NotImplementedException();
Model数据源模型
public class ABC : INotifyPropertyChanged
public ABC()
public string id;
public string ID
return id;
id = value;
OnPropertyChanged("ID");
public string des;
public string Des
return des;
des = value;
OnPropertyChanged("Des");
public string name;
public string Name
return name;
name = value;
OnPropertyChanged("Name");
protected internal virtual void OnPropertyChanged(string propertyName)
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
public event PropertyChangedEventHandler PropertyChanged;
public class People : INotifyPropertyChanged
public People()
Genre = new Genre();
ItemList = new ObservableCollection<ABC>(){
new ABC(){ ID = "1",Name = "AAA",des="1"},
new ABC(){ ID = "2",Name = "BBB",des="0"}
public string ID { get; set; }
public string Name2 { get; set; }
public string Name { get; set; }
public string Price { get; set; }
public ObservableCollection<ABC> itemList;
public ObservableCollection<ABC> ItemList
return itemList;
itemList = value;
OnPropertyChanged("ItemList");
public Genre Genre;
protected internal virtual void OnPropertyChanged(string propertyName)
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
public event PropertyChangedEventHandler PropertyChanged;
public class Genre
public string Name { get; set; }
数据源绑定
public partial class MainWindow : Window, INotifyPropertyChanged
public MainWindow()
InitializeComponent();
ObservableCollection<People> m_Peoples = new ObservableCollection<People>();
public event PropertyChangedEventHandler PropertyChanged;
protected internal virtual void OnPropertyChanged(string propertyName)
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
public ObservableCollection<People> People
return m_Peoples;
m_Peoples = value;
OnPropertyChanged("People");
public static ObservableCollection<People> GetPeopleAll()
ObservableCollection<People> People = new ObservableCollection<People>();
for (int i = 0; i < 4; i++)
People.Add(new People() { ID = (i + 1).ToString(), Name = "李四" + (i + 1).ToString(), Name2 = "测试文本" + (i + 1).ToString(), Genre = new Genre() { Name = "张三" + (i + 1).ToString() }, Price = "100" + (i + 1).ToString() });
return People;
private void Window_Loaded(object sender, RoutedEventArgs e)
People = GetPeopleAll();
dataGrid.DataContext = People;
