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private void AddLabel(IFeatureLayer pLayer,string fieldname,ITextSymbol Symbol) { container.DeleteAllElements(); IFeatureClass pClass = pLayer.FeatureClass; IFields pFields = pClass.Fields; int index = pFields.FindField(fieldname); ITextElement pTextElement; IEnvelope pEnv = null; IElement pElement = null; //pTextElement.ScaleText = true; //pTextElement.Symbol = Symbol; IFeatureCursor pCursor = pClass.Search(null, false); IFeature pFeature; IPoint point; pFeature = pCursor.NextFeature(); while (pFeature != null) { pEnv = pFeature.Extent; point = new PointClass(); point.PutCoords((pEnv.XMin + pEnv.XMax) * 0.5, (pEnv.YMax + pEnv.YMin) * 0.5); pTextElement = new TextElementClass(); pTextElement.Symbol = Symbol; pTextElement.ScaleText = true; pTextElement.Text = pFeature.get_Value(index).ToString(); pElement = pTextElement as IElement; pElement.Geometry = point; container.AddElement(pElement, 0); pFeature = pCursor.NextFeature(); } axMapControl1.Refresh(); }
以上为第一种方法，另一种方法（利用提供的接口）：
private void Label(IFeatureLayer pLayer, string fieldname, ITextSymbol Symbol) { IGeoFeatureLayer pGeoFeaturelayer = pLayer as IGeoFeatureLayer; IAnnotateLayerPropertiesCollection annotLayercol = pGeoFeaturelayer.AnnotationProperties; annotLayercol.Clear(); IBasicOverposterLayerProperties basicoverPost = new BasicOverposterLayerPropertiesClass(); basicoverPost.BufferRatio = 0.2; switch (pLayer.FeatureClass.ShapeType) { case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon: basicoverPost.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolygon; break; case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline: basicoverPost.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolyline; break; case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint: basicoverPost.FeatureType = esriBasicOverposterFeatureType.esriOverposterPoint; break; } ILabelEngineLayerProperties pLabelEngine = new LabelEngineLayerPropertiesClass(); pLabelEngine.Expression = "[" + fieldname + "]"; pLabelEngine.Symbol = Symbol; pLabelEngine.BasicOverposterLayerProperties = basicoverPost; annotLayercol.Add((IAnnotateLayerProperties)pLabelEngine); pGeoFeaturelayer.DisplayAnnotation = true; axMapControl1.Refresh(); }
最后调用：
private void labelFeatureToolStripMenuItem_Click(object sender, EventArgs e)
{
//MessageBox.Show(PropertiesForm.FieldName);
IFeatureLayer layer = axMapControl1.CustomProperty as IFeatureLayer;
IGeoFeatureLayer pGeoFeaturelayer = layer as IGeoFeatureLayer;
IAnnotateLayerPropertiesCollection annotLayercol = pGeoFeaturelayer.AnnotationProperties;
string fieldname = PropertiesForm.FieldName;
ITextSymbol symbol = PropertiesForm.TextSymbol;
if (show == false)
{
//AddLabel(layer, "XZQMC", symbol);
Label(layer, fieldname, symbol);
show = true;
MessageBox.Show("插入成功！");
}
else
{
annotLayercol.Clear();
//container.DeleteAllElements();
show = false;
axMapControl1.Refresh();
}
}
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原文地址：http://www.cnblogs.com/GiserNet/p/4178005.html
