如何使用IFeatureProgress接口？

首先构建FeatureProgressHelper类：

private class FeatureProgressHelper : IFeatureProgress

{

  private int featureCount = 0;



  private int stepValue = 0;



  String IFeatureProgress.FeatureClassName

  {

    set { Console.WriteLine(FeatureClassName: {0}, value); }

  }



  Boolean IFeatureProgress.IsCancelled

  {

    get { return false; }

  }



  int IFeatureProgress.MaxFeatures

  {

    set { Console.WriteLine(MaxFeatures: {0}, value); }

  }



  int IFeatureProgress.MinFeatures

  {

    set { Console.WriteLine(MinFeatures: {0}, value); }

  }



  int IFeatureProgress.Position

  {

    set { Console.WriteLine(Position: {0}, value); }

  }



  void IFeatureProgress.Step()

  {

    // Increment the number of features replicated and display the progress.

    featureCount += stepValue;

    Console.WriteLine({0} features replicated., featureCount);

  }



  int IFeatureProgress.StepValue

  {

    set { stepValue = value; }

  }

}

public FeatureProgressHelper(IConnectionPointContainer connectionPointContainer)

{

  // Get the event source''s connection points.

  IEnumConnectionPoints enumConnectionPoints = null;

  connectionPointContainer.EnumConnectionPoints(out enumConnectionPoints);

  enumConnectionPoints.Reset();



  // Iterate through the connection points until one for IFeatureProgress is found.

  IConnectionPoint connectionPoint = null;

  Guid featureProgressGuid = typeof(IFeatureProgress).GUID;

  uint pcFetched = 0;

  enumConnectionPoints.RemoteNext(1, out connectionPoint, out pcFetched);

  while (connectionPoint != null)

  {	

    Guid connectionInterfaceGuid;

    connectionPoint.GetConnectionInterface(out connectionInterfaceGuid);

    if (connectionInterfaceGuid == featureProgressGuid)

    {

      break;

    }

    enumConnectionPoints.RemoteNext(1, out connectionPoint, out pcFetched);

  }



  // If IFeatureProgress wasn''t found, throw an exception.

  if (connectionPoint == null)

  {

    throw new ArgumentException(An IFeatureProgress connection point could not be found.);

  }



  // Tie into the connection point.

  uint connectionPointCookie = 0;

  connectionPoint.Advise(this, out connectionPointCookie);

}



然后在进行数据转换时调用：



IFeatureDataConverter featureDataConverter  = new FeatureDataConverterClass();

IConnectionPointContainer connectionPointContainer = (IConnectionPointContainer)featureDataConverter;

FeatureProgressHelper featureProgressHelper = new FeatureProgressHelper(connectionPointContainer);