http://blog.csdn.net/mydriverc/article/details/1675613
//IFeatureWorkspaceAnno Example
//The following example show how to use the CreateAnnotationClass on IFeatureWorkspaceAnno
//to create a new feature-linked annotation class. In this function, the annotation class is
//feature-linked to the feature class that is supplied as an argument and is created in the
//same feature dataset as the feature class it is linked to.//The label expression is a simple expression of the values in the field called
//DESCRIPTION in the feature class it is linked to. A text symbol for the feature-linked
//annotation is red with a font of "Courier New".//e.g., nameOfFeatureClass = "States";
//on ArcSDE use ISqlSyntax::QualifyTableName for fully qualified table names.
public IFeatureClass IFeatureWorkspaceAnno_Example(IFeatureClass featureClass)
{
IDataset dataset = (IDataset)featureClass;
//cast for the feature workspace from the workspace
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)dataset.Workspace;
IFeatureWorkspaceAnno featureWorkspaceAnno = (IFeatureWorkspaceAnno)dataset.Workspace;
//set up the reference scale
ESRI.ArcGIS.Carto.IGraphicsLayerScale graphicLayerScale =
new ESRI.ArcGIS.Carto.GraphicsLayerScaleClass();
IGeoDataset geoDataset = (IGeoDataset)dataset;
graphicLayerScale.Units = ESRI.ArcGIS.esriSystem.esriUnits.esriFeet;
graphicLayerScale.ReferenceScale = 2000;
//set up symbol collection
ESRI.ArcGIS.Display.ISymbolCollection symbolCollection =
new ESRI.ArcGIS.Display.SymbolCollectionClass();#region "MakeText"
ESRI.ArcGIS.Display.IFormattedTextSymbol myTextSymbol =
new ESRI.ArcGIS.Display.TextSymbolClass();
//set the font for myTextSymbol
stdole.IFontDisp myFont = new stdole.StdFontClass() as stdole.IFontDisp;
myFont.Name = "Courier New";
myFont.Size = 9;
myTextSymbol.Font = myFont;
//set the Color for myTextSymbol to be Dark Red
ESRI.ArcGIS.Display.IRgbColor rgbColor = new ESRI.ArcGIS.Display.RgbColorClass();
rgbColor.Red = 150;
rgbColor.Green = 0;
rgbColor.Blue = 0;
myTextSymbol.Color = (ESRI.ArcGIS.Display.IColor)rgbColor;
//Set other properties for myTextSymbol
myTextSymbol.Angle = 0;
myTextSymbol.RightToLeft = false;
myTextSymbol.VerticalAlignment = ESRI.ArcGIS.Display.esriTextVerticalAlignment.esriTVABaseline;
myTextSymbol.HorizontalAlignment = ESRI.ArcGIS.Display.esriTextHorizontalAlignment.esriTHAFull;
myTextSymbol.CharacterSpacing = 200;
myTextSymbol.Case = ESRI.ArcGIS.Display.esriTextCase.esriTCNormal;
#endregionsymbolCollection.set_Symbol(0, (ESRI.ArcGIS.Display.ISymbol)myTextSymbol);
//set up the annotation labeling properties including the expression
ESRI.ArcGIS.Carto.IAnnotateLayerProperties annoProps = new
ESRI.ArcGIS.Carto.LabelEngineLayerPropertiesClass();
annoProps.FeatureLinked = true;
annoProps.AddUnplacedToGraphicsContainer = false;
annoProps.CreateUnplacedElements = true;
annoProps.DisplayAnnotation = true;
annoProps.UseOutput = true;ESRI.ArcGIS.Carto.ILabelEngineLayerProperties layerEngineLayerProps =
(ESRI.ArcGIS.Carto.ILabelEngineLayerProperties)annoProps;
ESRI.ArcGIS.Carto.IAnnotationExpressionEngine annoExpressionEngine =
new ESRI.ArcGIS.Carto.AnnotationVBScriptEngineClass();
layerEngineLayerProps.ExpressionParser = annoExpressionEngine;
layerEngineLayerProps.Expression = "[DESCRIPTION]";
layerEngineLayerProps.IsExpressionSimple = true;
layerEngineLayerProps.Offset = 0;
layerEngineLayerProps.SymbolID = 0;
layerEngineLayerProps.Symbol = myTextSymbol;ESRI.ArcGIS.Carto.IAnnotateLayerTransformationProperties annoLayerTransProp =
(ESRI.ArcGIS.Carto.IAnnotateLayerTransformationProperties)annoProps;
annoLayerTransProp.ReferenceScale = graphicLayerScale.ReferenceScale;
annoLayerTransProp.Units = graphicLayerScale.Units;
annoLayerTransProp.ScaleRatio = 1;ESRI.ArcGIS.Carto.IAnnotateLayerPropertiesCollection annoPropsColl =
new ESRI.ArcGIS.Carto.AnnotateLayerPropertiesCollectionClass();
annoPropsColl.Add(annoProps);
//use the AnnotationFeatureClassDescription to get the list of required
//fields and the default name of the shape field
IObjectClassDescription oCDesc = new ESRI.ArcGIS.Carto.AnnotationFeatureClassDescriptionClass();
IFeatureClassDescription fCDesc = (IFeatureClassDescription)oCDesc;
//create the new class
return featureWorkspaceAnno.CreateAnnotationClass("AnnoTest",
oCDesc.RequiredFields, oCDesc.InstanceCLSID, oCDesc.ClassExtensionCLSID,
fCDesc.ShapeFieldName, "", featureClass.FeatureDataset, featureClass,
annoPropsColl, graphicLayerScale, symbolCollection, true);
}