IObjectLoader2 Interface

// This example loads only the states of California and Oregon.
public void loadObjects(String output, String input, String outputFeatureClassName, String inputFeatureClassName)
{
    //Set up the output feature classes, i.e. the destination
    IWorkspaceFactory outputWorkspaceFactory = new AccessWorkspaceFactoryClass();

    IFeatureWorkspace outputFeatureWorkspace = outputWorkspaceFactory.OpenFromFile(output, 0) as IFeatureWorkspace;
    IFeatureClass outputFeatureClass = outputFeatureWorkspace.OpenFeatureClass(outputFeatureClassName);
    // Set up the input feature classe, i.e. the data source
    IWorkspaceFactory inFeatureWorkspaceFactory = new AccessWorkspaceFactoryClass();
    IFeatureWorkspace inFeatureWorkspace = inFeatureWorkspaceFactory.OpenFromFile(input, 0) as IFeatureWorkspace;
    IFeatureClass inFeatureClass = inFeatureWorkspace.OpenFeatureClass(inputFeatureClassName);
    // Specify a subset of the input data
    IQueryFilter queryFilter = new QueryFilterClass();
    queryFilter.SubFields = "SHAPE,STATE_NAME,STATE_FIPS,AREA";
    queryFilter.WhereClause = "STATE_NAME = 'California' OR STATE_NAME = 'Oregon'";

    //OutputFields parameter needs to match sub-fields in input queryfilter
    IFields allFields = outputFeatureClass.Fields;
    IFields outFields = new FieldsClass();
    IFieldsEdit outFieldsEdit = outFields as IFieldsEdit;
    // Get the query filter sub-fields as an array
    // and loop through each field in turn,
    // adding it to the ouput fields
    String[] subFields = (queryFilter.SubFields).Split(',');
    for(int j = 0; j < subFields.Length; j++)
    {
        int fieldID = allFields.FindField(subFields[j]);
        if(fieldID == -1)
        {
            System.Windows.Forms.MessageBox.Show("field not found: " +  subFields[j]);
            return;
        }
        outFieldsEdit.AddField(allFields.get_Field(fieldID));
    }

    IObjectLoader objectLoader = new ObjectLoaderClass();
    IEnumInvalidObject invalidObjectEnum;
    objectLoader.LoadObjects(
        null,
        (ITable)inFeatureClass,
        queryFilter,
        (ITable)outputFeatureClass,
        outFields,
        false,
        0,
        false,
        false,
        10,
        out invalidObjectEnum
    );
       
              
    IInvalidObjectInfo invalidObject = invalidObjectEnum.Next();
    if(invalidObject != null)
    {
        System.Windows.Forms.MessageBox.Show("Some or all features did not load");
    }
}