WPF列表框绑定 [英] WPF Listbox binding

问题描述

我有一个医生对象，它的属性之一是诊所的ObservableList.在窗口中使用它来显示医生的详细信息.我可以将各个属性绑定到TextBox和ComboBox控件，但是无法获取要绑定到ListBox的诊所列表.

I have a physician object, and one of its properties is an ObservableList of clinics. It is being used in a window to show the details of a physician. I can get individual properties to bind to TextBox and ComboBox controls, but I can't get the list of clinics to bind to my ListBox.

这是我的ListBox的xaml:

<ListBox Height="318" 
 HorizontalAlignment="Left" 
 Margin="422,0,0,0" 
 Name="lbClinic" 
 VerticalAlignment="Top" 
 Width="158" 
 SelectedValue="{Binding ClinicID, Path=Clinics, Mode=TwoWay, 
                          UpdateSourceTrigger = PropertyChanged}"
 SelectedValuePath="ClinicID" 
 DisplayMemberPath="Name"
 ItemsSource="{Binding DataContext.ClinicList, 
                          ElementName = PhysicianInfoLookup, Mode = OneWay}" 
 SelectionMode="Multiple" />

使用来自所有可能诊所列表的ClinicList中的项目正确填充列表框.但是，我无法从Doctor对象获取Clinics列表进行绑定，因此无法在Listbox中选择它的项目.我也想走另一条路，如果取消选择某个项目，医师对象中的ObservableList也会相应更改.

The Listbox populates properly with items from the ClinicList which is a list of all possible clinics. However, I cannot get the Clinics list from the physician object to bind so that it's items are selected in the Listbox. I also want to go the other way and if an item is deselected, the ObservableList in the physician object will change accordingly.

我如何双向绑定我的医师对象中的ObservableList of Clinics和我的列表框中的诊所列表(Clinical对象的ObservableList)?

How do I two-way bind the ObservableList of Clinics in my physician object to the list of Clinics (ObservableList of clinic objects) in my Listbox?

谢谢.

推荐答案

Mike，绑定问题很少. 这是一个完整的示例，展示了您所追求的一种方法(我认为).

Mike, there are few problems with your bindings. Here's a complete sample demonstrating one way of doing what (I think) you're after.

查看:

<Page.Resources>
    <ViewModel:Physician x:Key="physician"/>
</Page.Resources>
<StackPanel DataContext="{StaticResource physician}" >
    <TextBlock Text="{Binding Name}" Background="Orange"/>
    <TextBlock Text="Works in:"/>
    <ListBox ItemsSource="{Binding Clinics}" 
             SelectedValue="{Binding SelectedClinicId}" 
             SelectedValuePath="Id" DisplayMemberPath="Name" />
</StackPanel>

查看模型:

public class Physician
{
    private int _selectedClinicId;

    public Physician()
    {
        Name = "Overpaid consultant";
        Clinics = new ObservableCollection<Clinic>
                      {
                          new Clinic {Id = 0, Name = "Out Patients"},
                          new Clinic {Id = 1, Name = "ENT"},
                          new Clinic {Id = 2, Name = "GE"},
                      };
    }

    public string Name { get; set; }
    public IEnumerable<Clinic> Clinics { get; private set; }

    public int SelectedClinicId
    {
        get { return _selectedClinicId; }
        set
        {
            if (value != _selectedClinicId)
            {
                Debug.WriteLine(string.Format("setting clinic to: {0}",value));
                _selectedClinicId = value;
            }
        }
    }
}

public class Clinic
{
    public int Id { get; set; }
    public string Name { get; set; }
}

请注意，对于读/写属性，您可能希望引发属性更改通知.

Note that for read/write properties you would probably want to raise property change notifications.

这篇关于WPF列表框绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！