Como criar um suplemento que retorne uma interface do usuário
Este exemplo mostra como criar um suplemento que retorna um Windows Presentation Foundation (WPF) para um aplicativo autônomo WPF host.
O suplemento retorna uma interface do usuário que é um controle de usuário WPF. O conteúdo do controle de usuário é um único botão que, quando clicado, exibe uma caixa de mensagem. O aplicativo autônomo WPF hospeda o suplemento e exibe o controle de usuário (retornado pelo suplemento) como o conteúdo da janela principal do aplicativo.
Pré-requisitos
Este exemplo destaca as extensões WPF para o modelo de suplemento do .NET Framework que habilitam esse cenário e pressupõe o seguinte:
Conhecimento do modelo de suplemento do .NET Framework, incluindo pipeline, suplemento e desenvolvimento de host. Se você não estiver familiarizado com esses conceitos, consulte Suplementos e extensibilidade. Para ver um tutorial que demonstra a implementação de um pipeline, um suplemento e um aplicativo host, consulte Instrução passo a passo: criando um aplicativo extensível.
Conhecimento das extensões WPF para o modelo de suplemento do .NET Framework, que pode ser encontrado aqui: Visão geral dos suplementos do WPF.
Exemplo
Para criar um suplemento que retorna uma interface do usuário do WPF requer código específico para cada segmento de pipeline, o suplemento e o aplicativo host.
Implementando o segmento de pipeline de contrato
Um método deve ser definido pelo contrato para retornar uma interface do usuário e seu valor de retorno deve ser do tipo INativeHandleContract. Isso é demonstrado pelo GetAddInUI
método do IWPFAddInContract
contrato no código a seguir.
using System.AddIn.Contract;
using System.AddIn.Pipeline;
namespace Contracts
{
/// <summary>
/// Defines the services that an add-in will provide to a host application
/// </summary>
[AddInContract]
public interface IWPFAddInContract : IContract
{
// Return a UI to the host application
INativeHandleContract GetAddInUI();
}
}
Imports System.AddIn.Contract
Imports System.AddIn.Pipeline
Namespace Contracts
''' <summary>
''' Defines the services that an add-in will provide to a host application
''' </summary>
<AddInContract>
Public Interface IWPFAddInContract
Inherits IContract
' Return a UI to the host application
Function GetAddInUI() As INativeHandleContract
End Interface
End Namespace
Implementando o segmento de pipeline de exibição de suplemento
Como o suplemento implementa as interfaces do usuário que ele fornece como subclasses do , o método no modo de exibição de suplemento que se correlaciona a IWPFAddInView.GetAddInUI
deve retornar um valor do FrameworkElementtipo FrameworkElement. O código a seguir mostra a exibição de suplemento do contrato, implementada como uma interface.
using System.AddIn.Pipeline;
using System.Windows;
namespace AddInViews
{
/// <summary>
/// Defines the add-in's view of the contract
/// </summary>
[AddInBase]
public interface IWPFAddInView
{
// The add-in's implementation of this method will return
// a UI type that directly or indirectly derives from
// FrameworkElement.
FrameworkElement GetAddInUI();
}
}
Imports System.AddIn.Pipeline
Imports System.Windows
Namespace AddInViews
''' <summary>
''' Defines the add-in's view of the contract
''' </summary>
<AddInBase>
Public Interface IWPFAddInView
' The add-in's implementation of this method will return
' a UI type that directly or indirectly derives from
' FrameworkElement.
Function GetAddInUI() As FrameworkElement
End Interface
End Namespace
Implementando o segmento de pipeline do adaptador no lado do suplemento
O método de contrato retorna um , mas o suplemento retorna um INativeHandleContractFrameworkElement (conforme especificado pelo modo de exibição do suplemento). Consequentemente, o FrameworkElement deve ser convertido em um INativeHandleContract antes de cruzar a fronteira de isolamento. Esse trabalho é executado pelo adaptador do lado do suplemento chamando ViewToContractAdapter, conforme mostrado no código a seguir.
using System.AddIn.Contract;
using System.AddIn.Pipeline;
using System.Windows;
using AddInViews;
using Contracts;
namespace AddInSideAdapters
{
/// <summary>
/// Adapts the add-in's view of the contract to the add-in contract
/// </summary>
[AddInAdapter]
public class WPFAddIn_ViewToContractAddInSideAdapter : ContractBase, IWPFAddInContract
{
IWPFAddInView wpfAddInView;
public WPFAddIn_ViewToContractAddInSideAdapter(IWPFAddInView wpfAddInView)
{
// Adapt the add-in view of the contract (IWPFAddInView)
// to the contract (IWPFAddInContract)
this.wpfAddInView = wpfAddInView;
}
public INativeHandleContract GetAddInUI()
{
// Convert the FrameworkElement from the add-in to an INativeHandleContract
// that will be passed across the isolation boundary to the host application.
FrameworkElement fe = this.wpfAddInView.GetAddInUI();
INativeHandleContract inhc = FrameworkElementAdapters.ViewToContractAdapter(fe);
return inhc;
}
}
}
Imports System.AddIn.Contract
Imports System.AddIn.Pipeline
Imports System.Windows
Imports AddInViews
Imports Contracts
Namespace AddInSideAdapters
''' <summary>
''' Adapts the add-in's view of the contract to the add-in contract
''' </summary>
<AddInAdapter>
Public Class WPFAddIn_ViewToContractAddInSideAdapter
Inherits ContractBase
Implements IWPFAddInContract
Private wpfAddInView As IWPFAddInView
Public Sub New(ByVal wpfAddInView As IWPFAddInView)
' Adapt the add-in view of the contract (IWPFAddInView)
' to the contract (IWPFAddInContract)
Me.wpfAddInView = wpfAddInView
End Sub
Public Function GetAddInUI() As INativeHandleContract Implements IWPFAddInContract.GetAddInUI
' Convert the FrameworkElement from the add-in to an INativeHandleContract
' that will be passed across the isolation boundary to the host application.
Dim fe As FrameworkElement = Me.wpfAddInView.GetAddInUI()
Dim inhc As INativeHandleContract = FrameworkElementAdapters.ViewToContractAdapter(fe)
Return inhc
End Function
End Class
End Namespace
Implementando o segmento de pipeline de exibição de host
Como o aplicativo host exibirá um , o método no modo de exibição do host que se correlaciona a IWPFAddInHostView.GetAddInUI
deve retornar um FrameworkElementvalor do tipo FrameworkElement. O código a seguir mostra a exibição do host do contrato, implementada como uma interface.
using System.Windows;
namespace HostViews
{
/// <summary>
/// Defines the host's view of the add-in
/// </summary>
public interface IWPFAddInHostView
{
// The view returns as a class that directly or indirectly derives from
// FrameworkElement and can subsequently be displayed by the host
// application by embedding it as content or sub-content of a UI that is
// implemented by the host application.
FrameworkElement GetAddInUI();
}
}
Imports System.Windows
Namespace HostViews
''' <summary>
''' Defines the host's view of the add-in
''' </summary>
Public Interface IWPFAddInHostView
' The view returns as a class that directly or indirectly derives from
' FrameworkElement and can subsequently be displayed by the host
' application by embedding it as content or sub-content of a UI that is
' implemented by the host application.
Function GetAddInUI() As FrameworkElement
End Interface
End Namespace
Implementando o segmento de pipeline do adaptador no lado do host
O método contract retorna um , mas o aplicativo host espera um INativeHandleContractFrameworkElement (conforme especificado pela exibição do host). Consequentemente, o deve ser convertido em um FrameworkElement após cruzar o INativeHandleContract limite de isolamento. Esse trabalho é executado pelo adaptador do lado do host chamando ContractToViewAdapter, conforme mostrado no código a seguir.
using System.AddIn.Contract;
using System.AddIn.Pipeline;
using System.Windows;
using Contracts;
using HostViews;
namespace HostSideAdapters
{
/// <summary>
/// Adapts the add-in contract to the host's view of the add-in
/// </summary>
[HostAdapter]
public class WPFAddIn_ContractToViewHostSideAdapter : IWPFAddInHostView
{
IWPFAddInContract wpfAddInContract;
ContractHandle wpfAddInContractHandle;
public WPFAddIn_ContractToViewHostSideAdapter(IWPFAddInContract wpfAddInContract)
{
// Adapt the contract (IWPFAddInContract) to the host application's
// view of the contract (IWPFAddInHostView)
this.wpfAddInContract = wpfAddInContract;
// Prevent the reference to the contract from being released while the
// host application uses the add-in
this.wpfAddInContractHandle = new ContractHandle(wpfAddInContract);
}
public FrameworkElement GetAddInUI()
{
// Convert the INativeHandleContract that was passed from the add-in side
// of the isolation boundary to a FrameworkElement
INativeHandleContract inhc = this.wpfAddInContract.GetAddInUI();
FrameworkElement fe = FrameworkElementAdapters.ContractToViewAdapter(inhc);
return fe;
}
}
}
Imports System.AddIn.Contract
Imports System.AddIn.Pipeline
Imports System.Windows
Imports Contracts
Imports HostViews
Namespace HostSideAdapters
''' <summary>
''' Adapts the add-in contract to the host's view of the add-in
''' </summary>
<HostAdapter>
Public Class WPFAddIn_ContractToViewHostSideAdapter
Implements IWPFAddInHostView
Private wpfAddInContract As IWPFAddInContract
Private wpfAddInContractHandle As ContractHandle
Public Sub New(ByVal wpfAddInContract As IWPFAddInContract)
' Adapt the contract (IWPFAddInContract) to the host application's
' view of the contract (IWPFAddInHostView)
Me.wpfAddInContract = wpfAddInContract
' Prevent the reference to the contract from being released while the
' host application uses the add-in
Me.wpfAddInContractHandle = New ContractHandle(wpfAddInContract)
End Sub
Public Function GetAddInUI() As FrameworkElement Implements IWPFAddInHostView.GetAddInUI
' Convert the INativeHandleContract that was passed from the add-in side
' of the isolation boundary to a FrameworkElement
Dim inhc As INativeHandleContract = Me.wpfAddInContract.GetAddInUI()
Dim fe As FrameworkElement = FrameworkElementAdapters.ContractToViewAdapter(inhc)
Return fe
End Function
End Class
End Namespace
Implementando o suplemento
Com o adaptador do lado do suplemento e o modo de exibição de suplemento criados, o suplemento () deve implementar o IWPFAddInView.GetAddInUI
método para retornar um FrameworkElement objeto (WPFAddIn1.AddIn
a UserControl neste exemplo). A implementação do UserControl, AddInUI
, é mostrada pelo código a seguir.
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="WPFAddIn1.AddInUI">
<StackPanel>
<Button Click="clickMeButton_Click" Content="Click Me!" />
</StackPanel>
</UserControl>
using System.Windows;
using System.Windows.Controls;
namespace WPFAddIn1
{
public partial class AddInUI : UserControl
{
public AddInUI()
{
InitializeComponent();
}
void clickMeButton_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show("Hello from WPFAddIn1");
}
}
}
Imports System.Windows
Imports System.Windows.Controls
Namespace WPFAddIn1
Partial Public Class AddInUI
Inherits UserControl
Public Sub New()
InitializeComponent()
End Sub
Private Sub clickMeButton_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
MessageBox.Show("Hello from WPFAddIn1")
End Sub
End Class
End Namespace
A implementação do IWPFAddInView.GetAddInUI
pelo suplemento simplesmente precisa retornar uma nova instância do AddInUI
, conforme mostrado pelo código a seguir.
using System.AddIn;
using System.Windows;
using AddInViews;
namespace WPFAddIn1
{
/// <summary>
/// Add-In implementation
/// </summary>
[AddIn("WPF Add-In 1")]
public class WPFAddIn : IWPFAddInView
{
public FrameworkElement GetAddInUI()
{
// Return add-in UI
return new AddInUI();
}
}
}
Imports System.AddIn
Imports System.Windows
Imports AddInViews
Namespace WPFAddIn1
''' <summary>
''' Add-In implementation
''' </summary>
<AddIn("WPF Add-In 1")>
Public Class WPFAddIn
Implements IWPFAddInView
Public Function GetAddInUI() As FrameworkElement Implements IWPFAddInView.GetAddInUI
' Return add-in UI
Return New AddInUI()
End Function
End Class
End Namespace
Implementando o aplicativo host
Com o adaptador do lado do host e a exibição de host criados, o aplicativo host pode usar o modelo de suplemento do .NET Framework para abrir o pipeline, adquirir uma exibição de host do suplemento e chamar o IWPFAddInHostView.GetAddInUI
método. Essas etapas são mostradas no código a seguir.
// Get add-in pipeline folder (the folder in which this application was launched from)
string appPath = Environment.CurrentDirectory;
// Rebuild visual add-in pipeline
string[] warnings = AddInStore.Rebuild(appPath);
if (warnings.Length > 0)
{
string msg = "Could not rebuild pipeline:";
foreach (string warning in warnings) msg += "\n" + warning;
MessageBox.Show(msg);
return;
}
// Activate add-in with Internet zone security isolation
Collection<AddInToken> addInTokens = AddInStore.FindAddIns(typeof(IWPFAddInHostView), appPath);
AddInToken wpfAddInToken = addInTokens[0];
this.wpfAddInHostView = wpfAddInToken.Activate<IWPFAddInHostView>(AddInSecurityLevel.Internet);
// Get and display add-in UI
FrameworkElement addInUI = this.wpfAddInHostView.GetAddInUI();
this.addInUIHostGrid.Children.Add(addInUI);
' Get add-in pipeline folder (the folder in which this application was launched from)
Dim appPath As String = Environment.CurrentDirectory
' Rebuild visual add-in pipeline
Dim warnings() As String = AddInStore.Rebuild(appPath)
If warnings.Length > 0 Then
Dim msg As String = "Could not rebuild pipeline:"
For Each warning As String In warnings
msg &= vbLf & warning
Next warning
MessageBox.Show(msg)
Return
End If
' Activate add-in with Internet zone security isolation
Dim addInTokens As Collection(Of AddInToken) = AddInStore.FindAddIns(GetType(IWPFAddInHostView), appPath)
Dim wpfAddInToken As AddInToken = addInTokens(0)
Me.wpfAddInHostView = wpfAddInToken.Activate(Of IWPFAddInHostView)(AddInSecurityLevel.Internet)
' Get and display add-in UI
Dim addInUI As FrameworkElement = Me.wpfAddInHostView.GetAddInUI()
Me.addInUIHostGrid.Children.Add(addInUI)
Confira também
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