我尝试了很多方法来让我的组合框工作,但我还是卡住了 :(
这是我的应用程序的一个非常简化版本:(刚刚编辑过,对错误感到抱歉)
<ListView ItemsSource="{Binding People}" SelectedItem="{Binding SelectedPerson}"/>
<ComboBox ItemsSource="{Binding Grades}" SelectedItem="{Binding SelectedPerson.MyGrade}"
DisplayMemberPath="Name"/>
并且代码背后:
public class Person
{
private string name;
public string Name
{
get { return name; }
set
{
if (name != value)
{
name = value;
NotifyPropertyChanged("Name");
}
}
}
private Grade myGrade;
public Grade MyGrade
{
get { return myGrade; }
set
{
if (myGrade != value)
{
myGrade = value;
NotifyPropertyChanged("MyGrade");
}
}
}
//-- INotifyPropertyChanged implementation
}
public class Grade
{
private string name;
public string Name
{
get { return name; }
set
{
if (name != value)
{
name = value;
NotifyPropertyChanged("Name");
}
}
}
private int prop;
public int Prop
{
get { return prop; }
set
{
if (prop != value)
{
prop = value;
NotifyPropertyChanged("Prop");
}
}
}
//-- INotifyPropertyChanged implementation
}
public partial class MainWindow : Window
{
public ObservableCollection<Person> People { get; set; }
public ObservableCollection<Grade> Grades { get; set; }
private Person selectedPerson;
public Person SelectedPerson
{
get { return selectedPerson; }
set
{
if (selectedPerson != value)
{
selectedPerson = value;
NotifyPropertyChanged("SelectedPerson");
}
}
}
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
People = new ObservableCollection<Person>();
Grades = new ObservableCollection<Grade>();
Grades.Add(new Grade() { Name = "Grade 1", Prop = 1 });
Grades.Add(new Grade() { Name = "Grade 2", Prop = 2 });
People.Add(new Person() { Name = "guy 1", MyGrade = Grades[0] });
People.Add(new Person() { Name = "guy 2", MyGrade = Grades[0] });
People.Add(new Person() { Name = "guy 3", MyGrade = Grades[1] });
}
//-- INotifyPropertyChanged implementation
}
问题在于当我在listview中选择项目时,combobox仍然为空。 Itemsource是正确的(如果我点击combobox,我可以看到“grade 1”和“grade 2”)。 我认为需要一些东西来告诉“Person.Grade是Grades列表的一部分”,但我找不到它的位置。
希望你能帮助我;)