CompositionContainer.Compose(CompositionBatch) 方法

定义

命名空间:
System.ComponentModel.Composition.Hosting
程序集:
System.ComponentModel.Composition.dll

添加或删除容器中指定的 CompositionBatch 部件并执行组合。

public:
 void Compose(System::ComponentModel::Composition::Hosting::CompositionBatch ^ batch);
public void Compose(System.ComponentModel.Composition.Hosting.CompositionBatch batch);
member this.Compose : System.ComponentModel.Composition.Hosting.CompositionBatch -> unit
Public Sub Compose (batch As CompositionBatch)

参数

batch
CompositionBatch

CompositionContainer对组合过程中要包含的更改。

示例

在此简单示例中，将创建三个部分并将其添加到其中 CompositionContainer，并检索一个部件，以显示已填充所有导入。 此示例使用 Attributed 编程模型。

[Export]
class Part1
{
    public String data = "This is the example data!";
}

[Export]
class Part2
{
    [Import]
    public Part1 data { get; set; }
}

[Export]
class Part3
{
    [Import]
    public Part2 data { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        CompositionContainer container = new CompositionContainer();
        CompositionBatch batch = new CompositionBatch();
        batch.AddPart(AttributedModelServices.CreatePart(new Part1()));
        batch.AddPart(AttributedModelServices.CreatePart(new Part2()));
        batch.AddPart(AttributedModelServices.CreatePart(new Part3()));
        container.Compose(batch);
        Part3 _part = container.GetExportedValue<Part3>();
        Console.WriteLine(_part.data.data.data);
        Console.ReadLine();
    }
}

<Export()>
Public Class Part1
    Public ReadOnly Property data As String
        Get
            Return "This is the example data!"
        End Get
    End Property
End Class
<Export()>
Public Class Part2
    <Import()>
    Public Property data As Part1
End Class

<Export()>
Public Class Part3
    <Import()>
    Public Property data As Part2
End Class


Sub Main()
    Dim container As New CompositionContainer()
    Dim batch As New CompositionBatch()
    batch.AddPart(AttributedModelServices.CreatePart(New Part1()))
    batch.AddPart(AttributedModelServices.CreatePart(New Part2()))
    batch.AddPart(AttributedModelServices.CreatePart(New Part3()))
    container.Compose(batch)
    Dim _part As Part3
    _part = container.GetExportedValue(Of Part3)()
    Console.WriteLine(_part.data.data.data)
    Console.ReadLine()

End Sub

注解

此方法是直接添加或删除容器中部件的主要方法。 它将 CompositionContainer 始终保持稳定、组合的状态。 因此，从不需要使用空CompositionBatch调用Compose来开始合成。 相反，只要需要对可用于的CompositionContainer部件进行更改，就调用Compose该方法。

CompositionBatch可以包含要添加的部件和要删除的部件。 每次调用 Compose时，将只进行一次重新组合。

适用于

另请参阅