如何将多个类添加到可观察集合中
我仍在自学如何绑定和使用可观察集合。我有点困惑的一个问题是将多个类/可观察集合绑定到一页。换句话说,如果我有一个 PersonName 类和一个 AnimalName 类,我必须为每个类创建两个单独的 observalbe 集合?当页面只允许一个时,我该如何设置数据上下文?
例如:
Public Class NameList
Inherits ObservableCollection(Of PersonName)
' Methods
Public Sub New()
MyBase.Add(New PersonName("Willa", "Cather"))
MyBase.Add(New PersonName("Isak", "Dinesen"))
MyBase.Add(New PersonName("Victor", "Hugo"))
MyBase.Add(New PersonName("Jules", "Verne"))
End Sub
End Class
Public Class PersonName
' Methods
Public Sub New(ByVal first As String, ByVal last As String)
Me._firstName = first
Me._lastName = last
End Sub
' Properties
Public Property FirstName() As String
Get
Return Me._firstName
End Get
Set(ByVal value As String)
Me._firstName = value
End Set
End Property
Public Property LastName() As String
Get
Return Me._lastName
End Get
Set(ByVal value As String)
Me._lastName = value
End Set
End Property
' Fields
Private _firstName As String
Private _lastName As String
End Class
现在如果我添加另一个类,我将如何在绑定部分和集合部分上将两者结合起来。感谢您的任何建议:)
public class AnimalName
'properties, ect...ect..ect..
End class
I'm still teaching myself how to bind and use observable collection. One problem that I'm a little confused on is binding multiple classes/observable collection to one page. In other words, if I have a PersonName class and a AnimalName class, I have to create two separate observalbe collections for each? How would I set the datacontext when a page only allows one?
For example:
Public Class NameList
Inherits ObservableCollection(Of PersonName)
' Methods
Public Sub New()
MyBase.Add(New PersonName("Willa", "Cather"))
MyBase.Add(New PersonName("Isak", "Dinesen"))
MyBase.Add(New PersonName("Victor", "Hugo"))
MyBase.Add(New PersonName("Jules", "Verne"))
End Sub
End Class
Public Class PersonName
' Methods
Public Sub New(ByVal first As String, ByVal last As String)
Me._firstName = first
Me._lastName = last
End Sub
' Properties
Public Property FirstName() As String
Get
Return Me._firstName
End Get
Set(ByVal value As String)
Me._firstName = value
End Set
End Property
Public Property LastName() As String
Get
Return Me._lastName
End Get
Set(ByVal value As String)
Me._lastName = value
End Set
End Property
' Fields
Private _firstName As String
Private _lastName As String
End Class
Now If I add another class, how would I combine the two on the binding part and collection part. Thanks for any advice :)
public class AnimalName
'properties, ect...ect..ect..
End class
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您需要将设置为 DataContext 的对象设为另一个类,其中包含人和动物的集合。然后,显示列表的控件可以将其 ItemsSource 属性绑定到 DataContext 中的相关属性,例如
您不能将它们添加到同一个集合中,除非它是它们都派生自的某种类型的集合(最终所有内容都派生自Object),但随后您必须处理如何在 UI 中正确呈现它们。
此外,虽然页面有一个 DataContext,但其中的所有内容也都有一个 DataContext,因此您可以单独绑定它们 - 否则它们只是从其父级继承 DataContext。
You need to make the object which you set as the DataContext to be another class which contains the collection of people and the collection of animals. Then your controls which display the lists can bind their ItemsSource properties to the relevant properties in the DataContext, such as
You can't add them both to the same collection unless it's a collection of some type that they both derive from (ultimately everything derives from Object), but then you have to deal with how to render them appropriately in the UI.
Also although the page has a DataContext, everything inside it has a DataContext too, so you can bind those individually - otherwise they just inherit the DataContext from their parent.
您应该将各个列表控件的
ItemSource
设置为单独的 ObservableCollections。You should set the
ItemSource
s of the individual list controls to separate ObservableCollections.