ArcObjectsはレイヤの扱いが直観的ではなく忘れやすい。
以下ではポリゴン、EPSG＝2451のメモリレイヤを作成してMapControlに追加
[code]
try
{
IFields fields = new Fields();
IFieldsEdit fieldsEdit = (IFieldsEdit)fields;
IField field = new Field();
IFieldEdit fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "OID";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;
fieldsEdit.AddField(fieldEdit);
field = new Field();
fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "NAME";
fieldEdit.Length_2 = 10;
fieldEdit.Type_2 = esriFieldType.esriFieldTypeString;
fieldsEdit.AddField(fieldEdit);
field = new Field();
fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "GEOM";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
IGeometryDef geometryDef = new GeometryDef();
IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolygon;
ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();
ISpatialReference spatialReference =
spatialReferenceFactory.CreateProjectedCoordinateSystem((int)2451);
ISpatialReferenceResolution spatialReferenceResolution = (ISpatialReferenceResolution)spatialReference;
spatialReferenceResolution.ConstructFromHorizon();
ISpatialReferenceTolerance spatialReferenceTolerance = (ISpatialReferenceTolerance)spatialReference;
spatialReferenceTolerance.SetDefaultXYTolerance();
geometryDefEdit.SpatialReference_2 = (ISpatialReference)spatialReference;
fieldEdit.GeometryDef_2 = geometryDefEdit;
fieldsEdit.AddField(fieldEdit);
Type factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.InMemoryWorkspaceFactory");
IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance(factoryType);
IWorkspaceName workspaceName = workspaceFactory.Create("", "MyWorkspace", null, 0);
IName name = (IName)workspaceName;
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)name.Open();
IFeatureClass featureClass =
featureWorkspace.CreateFeatureClass(
"NewPolygon",
fields,
null,
null,
esriFeatureType.esriFTSimple,
"GEOM", "");
IFeatureLayer featureLayer = new FeatureLayer();
featureLayer.FeatureClass = featureClass;
featureLayer.Name = "mempoly";
axMapControl1.AddLayer(featureLayer);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e.Message);
}
[/code]
参考にしたサイト
InMemoryWorkspaceFactory CoClass
Creating a featureclass in memory and adding to the map error
IFeatureWorkspace.CreateFeatureClass Example