[分享]用C#实现命令“创建要素”的实现方法
平台：vs.net2008Map3d 2010部份实现代码:
using OSGeo.MapGuide;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.Gis.Map.Platform;
using Autodesk.Gis.Map.Platform.Interop;
///
/// 创建要素
///
public void CreateFeature()
{
AcMapMap currentMap = AcMapMap.GetCurrentMap();
MgLayerCollection layers = currentMap.GetLayers();
MgLayerBase layer = SelectLayer(layers);
MgClassDefinition classDef = layer.GetClassDefinition();
MgPropertyDefinitionCollection propDefs = classDef.GetProperties();
ObjectIdCollection objIds = CGcEditor.SelectEntities();
int count = 0;
Database db =
Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Database;
TransactionManager tm = db.TransactionManager;
using (Transaction transaction = tm.StartTransaction())
{
foreach (ObjectId objId in objIds)
{
Entity entity = (Entity)tm.GetObject(objId, OpenMode.ForWrite, false);
bool addSuccess = AddFeature(layer, entity);
if (addSuccess)
{
count++;
entity.Erase();
}
}
string msg = "Convert the entity to feature successfully.";
if (count > 1)
{
msg = string.Format("Converted {0} entities to features successfully!", count);
}
if (count > 0)
{
CGcEditor.ShowMessage(msg);
}
transaction.Commit();
}
}
///
/// Entity -> MgGeometry
///
private bool AddFeature(MgLayerBase layer, Entity entity)
{
if (layer == null || entity == null)
return false;
MgGeometry geometry = CEntityToGeometryConverter.EntityToGeometry(entity);
if (geometry == null)
return false;
MgClassDefinition classDef = layer.GetClassDefinition();
string featClassName = layer.FeatureClassName;
MgPropertyDefinitionCollection propDefs = classDef.GetProperties();
MgGeometricPropertyDefinition geoPropDef = propDefs.GetItem(classDef.DefaultGeometryPropertyName)
as MgGeometricPropertyDefinition;
int layerGeometryType = geoPropDef.GeometryTypes;
int geoType = geometry.GetGeometryType();
if (!GeometryTypeValidate(layerGeometryType, geoType))
{
CGcEditor.ShowMessage("Geometry type of the entity is invalid to the targeting layer.");
return false;
}
MgPropertyCollection props = new MgPropertyCollection();
props = InputPropertyValues(propDefs, geometry);
if (props != null)
{
MgInsertFeatures insertFeat = new MgInsertFeatures(featClassName, props);
MgFeatureCommandCollection featCommands = new MgFeatureCommandCollection();
featCommands.Add(insertFeat);
try
{
layer.UpdateFeatures(featCommands);
}
catch (System.Exception e)
{
CGcEditor.ShowMessage("Failed to add a Feature.");
CGcEditor.ShowMessage(e.Message);
return false;
}
return true;
}
else
{
CGcEditor.ShowMessage("Operation cancelled");
return false;
}
}
///
/// Convert Entity to MgGeometry.
///
public static MgGeometry EntityToGeometry(Entity entity)
{
if (entity == null)
return null;
MgGeometry geometry = null;
string entityType = entity.GetType().Name;
switch (entityType)
{
case "DBPoint":
geometry = PointGeometryConvert((DBPoint)entity);
break;
case "Line":
geometry = LineGeometryConvert((Line)entity);
break;
case "Polyline":
geometry = PolylineGeometryConvert((Polyline)entity);
break;
case "MPolygon":
geometry = MPolygonGeometryConvert((MPolygon)entity);
break;
default:
break;
}
return geometry;
}
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