如何：使用限定数据

更新：2007 年 11 月

任何相关意图都可以通过将一个或多个 QualificationDataAttribute 属性应用于管线段，从而为该管线段分配限定数据来实现。每个属性都指定字符串数据的简单名称/值对。例如，您可以通过指定名称/值对“Security”和“FullTrust”，指示应以完全信任的方式来激活外接程序。同样，您可以通过指定名称/值对“Isolation”和“NewProcess”，指示应将管线段隔离在其自身的进程中。

向管线段应用限定数据

• 使用 QualificationDataAttribute 属性。

  ' This pipeline segment has
  ' two attributes:
  ' 1 - An AddInAttribute to identify
  '     this segment as an add-in.
  '
  ' 2 - A QualificationDataAttribute to
  '     indicate that the add-in should
  '     be loaded into a new application domain.
  
  <AddIn("Calculator Add-in", Version:="2.0.0.0")> _
  <QualificationData("Isolation", "NewAppDomain")> _
      Public Class SampleV2AddIn
  

  // This pipeline segment has
  // two attributes:
  // 1 - An AddInAttribute to identify
  //     this segment as an add-in.
  //
  // 2 - A QualificationDataAttribute to
  //     indicate that the add-in should
  //     be loaded into a new application domain.
  
      [AddIn("Calculator Add-in",Version="2.0.0.0")]
      [QualificationData("Isolation", "NewAppDomain")]
      public class SampleV2AddIn : Calculator2
      {
  

确定特定管线段的限定数据

• 使用 AddInToken 对象的 QualificationData 属性来获取与标记关联的管线段及其限定数据的字典，然后使用相应的 AddInSegmentType 值获取包含名称/值对的字典，这些名称/值对由所需管线段的限定数据组成。

  ' Use qualification data to control
  ' how an add-in should be activated.
  
  If selectedToken.QualificationData(AddInSegmentType.AddIn)("Isolation").Equals("NewProcess") Then
      ' Create an external process.
      Dim external As AddInProcess = New AddInProcess
  
      ' Activate an add-in in an automatically generated
      ' application domain with a full trust security level.
      Dim CalcAddin5 As Calculator = _
          selectedToken.Activate(Of Calculator)(external, _
              AddInSecurityLevel.FullTrust)
      Console.WriteLine("Add-in activated per qualification data.")
  Else
      Console.WriteLine("This add-in is not designated to be activated in a new process.")
  End If
  

  // Use qualification data to control 
  // how an add-in should be activated.
  
  if (selectedToken.QualificationData[AddInSegmentType.AddIn]["Isolation"].Equals("NewProcess"))
  {
      // Create an external process.
      AddInProcess external = new AddInProcess();
  
      // Activate an add-in in the new process
      // with the full trust security level.
      Calculator CalcAddIn5 =
          selectedToken.Activate<Calculator>(external,
          AddInSecurityLevel.FullTrust);
      Console.WriteLine("Add-in activated per qualification data.");
  }
  else
      Console.WriteLine("This add-in is not designated to be activated in a new process.");
  

  如果管线段没有任何限定数据，则其名称/值对字典为空。

  说明：
  该外接程序模型不使用应用于外接程序宿主视图的限定数据。因此，AddInSegmentType.HostViewOfAddIn 的字典总是为空。

列出所有管线段的限定数据

• 枚举 AddInToken 对象，就像它是 QualificationDataItem 结构的集合一样。

  ' Show the qualification data for each
  ' token in an AddInToken collection.
  For Each token As AddInToken In tokens
      For Each qdi As QualificationDataItem In token
          Console.WriteLine("{0} {1}\n\t QD Name: {2}, QD Value: {3}", _
              token.Name, qdi.Segment, qdi.Name, qdi.Value)
      Next
  Next
  

  // Show the qualification data for each
  // token in an AddInToken collection.
  foreach (AddInToken token in tokens)
  {
      foreach (QualificationDataItem qdi in token)
      {
          Console.WriteLine("{0} {1}\n\t QD Name: {2}, QD Value: {3}",
              token.Name,
              qdi.Segment, 
              qdi.Name, 
              qdi.Value);
      }
  }
  
  

  说明：
  该外接程序模型不使用应用于外接程序宿主视图的限定数据。因此，在枚举限定数据时，将找不到任何 Segment 属性为 AddInSegmentType.HostViewOfAddIn 的项。

请参见

其他资源

外接程序和扩展性