可编辑组合框无法获取项目wpf

Question

我有一个组合框，我设置了isEditable = true，但当我从键盘上按下向下箭头时，我会收到以下消息

MoalemYar.DataClass.DataTransferObjects+StudentsDto

这不是我选择的项目，而是我的组合框

<ComboBox
x:Name="cmbEditStudent"
IsEditable="True"
SelectedValue="{Binding LName}"
SelectedValuePath="Id">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" />
<TextBlock Text=" " />
<TextBlock Text="{Binding LName}" />
<TextBlock Text=" - " />
<TextBlock Text="نام پدر(" />
<TextBlock Text="{Binding FName}" />
<TextBlock Text=")" />
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>

Answer 1

Try this hope it will helps you
<ComboBox Height="25" Margin="80,12,12,0" Name="comboBox1" VerticalAlignment="Top" 
ItemsSource="{Binding StudentList}" IsEditable="True" TextSearch.TextPath="StudentName">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding StudentName}" />
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>

Answer 2

默认情况下，组合框中的第一个项目由下箭头选择，然后您可以按上/下箭头键相应地更改所选项目。

请尝试以下代码。

在XAML中

<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="20"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ComboBox
x:Name="cmbEditStudent"
IsTextSearchEnabled="True"   
TextSearch.TextPath = "Name"
IsEditable="True"
ItemsSource="{Binding StudentsList}"
SelectedItem="{Binding SelectedStudent}">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" />
<TextBlock Text=" " />
<TextBlock Text="{Binding LName}" />
<TextBlock Text=" - " />
<TextBlock Text="نام پدر(" />
<TextBlock Text="{Binding FName}" />
<TextBlock Text=")" />
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<TextBox Width="200" Height="20" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>

在其视图模型中

public partial class MainWindow : Window, INotifyPropertyChanged
{
private ObservableCollection<Student> studentsList = new ObservableCollection<Student>();
public ObservableCollection<Student> StudentsList
{
get { return studentsList; }
set
{
studentsList = value;
NotifyPropertyChanged();
}
}
private Student selectedStudent;
public Student SelectedStudent
{
get { return selectedStudent; }
set
{
selectedStudent = value;
}
}
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
StudentsList.Add(new Student("Paul", "LName1", "FName1"));
StudentsList.Add(new Student("Alex", "LName2", "FName2"));
StudentsList.Add(new Student("Steve", "LName3", "FName3"));
}
#region Notify Property
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged([CallerMemberName] string propName = null)
{
if (!string.IsNullOrWhiteSpace(propName))
{
Application.Current.Dispatcher.Invoke(new Action(() =>
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
}));
}
}
#endregion
}

学生班

public class Student : NotifiableBase
{
private string name;
public string Name
{
get { return name; }
set
{
name = value;
NotifyPropertyChanged();
}
}
private string lName;
public string LName
{
get { return lName; }
set
{
lName = value;
NotifyPropertyChanged();
}
}
private string fName;
public string FName
{
get { return fName; }
set
{
fName = value;
NotifyPropertyChanged();
}
}
public Student(string name, string lName, string fName)
{
this.name = name;
this.lName = lName;
this.fName = fName;
}
}

NotificationBase

public class NotifiableBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged([CallerMemberName] string propName = null)
{
if (!string.IsNullOrWhiteSpace(propName))
{
Application.Current.Dispatcher.Invoke(new Action(() =>
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
}));
}
}
}