Saat ini saya sedang mengerjakan sebuah proyek di mana ketika pengguna memuat peta mereka (mxd) ke dalam sistem kami, kami membuat beberapa featuerlayers khusus untuk mereka. Masalah saya adalah, saya tidak tahu cara memeriksa apakah saya sudah SUDAH menciptakan lapisan-lapisan tersebut (katakanlah pengguna memuat mxd, lapisan dibuat, menyimpan, memuat ulang mxd, harus memverifikasi apakah lapisan sudah ada).
Apakah ada Id unik untuk FeatuerLayerClass di ArcEngine10, ada OIDName, dan ObjectClassID di FeatureLayerClass.FeatureClass, tetapi yang tampaknya tidak berfungsi (tidak dapat menetapkan ObjectClassId, dan ingin menggunakan UniqueId untuk OIDName)?
Saya membuat lapisan saya sebagai objek bisnis dengan classelayerclass seperti ini.
Kode:
/// <summary>
/// Unique Route LayerId
/// </summary>
public static Guid RouteFeatureLayerId
{
get { return Guid.Parse("ba25a332-0e48-4ce5-a4c5-38dc36c0700c"); }
}
/// <summary>
/// Feature class that stores info on the routes
/// </summary>
public FeatureLayerClass RouteFeatureLayer
{
get
{
if (_routeFeatureClass == null)
{
IPropertySet property = new PropertySetClass();
property.SetProperty("Id", RouteFeatureLayerId);
_routeFeatureClass = new FeatureLayerClass();
_routeFeatureClass.FeatureClass = CreateFeatureClass(Workspace, null, ShapeType.Polylines.ToString(), CreateFields(ShapeType.Polylines, FeatureLayerType.Routes), null, null, "");
_routeFeatureClass.Name = "Routes";
_routeFeatureClass.Visible = true;
_routeFeatureClass.Cached = true;
_routeFeatureClass.AddExtension(property);
CustomLayers.Add(_routeFeatureClass);
}
return _routeFeatureClass;
}
set
{
_routeFeatureClass = value;
}
}
Menciptakan ruang kerja
/// <summary>
/// Create a workspace for the shapefile or geodatabase
/// </summary>
private IWorkspace CreateWorkspace(string workspaceType, string workspaceDirectory)
{
Type factoryType = null;
IWorkspaceFactory workspaceFactory = null;
switch (workspaceType)
{
case "Shapefile":
// Instantiate a Shapefile workspace factory
factoryType = Type.GetTypeFromProgID("esriDataSourcesFile.ShapefileWorkspaceFactory");
break;
case "PersonalGeodatabase":
// Instantiate an Access workspace factory
factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.AccessWorkspaceFactory");
break;
case "FileGeodatabase":
// Instantiate a file geodatabase workspace factory
factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.FileGDBWorkspaceFactory");
break;
}
workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance(factoryType);
//Create a directory hierarchy to seperate out datasets created for Points, Polylines, and Polygons
Directory.CreateDirectory(workspaceDirectory);
IWorkspaceName workspaceName = workspaceFactory.Create(workspaceDirectory + "\\", workspaceType, null, 0);
IName Name = (IName)workspaceName;
IWorkspace workspace = (IWorkspace)(Name.Open());
return workspace;
}
Membuat FeatureClass
/// <summary>
/// Helper to create a Feature Class.
/// </summary>
private IFeatureClass CreateFeatureClass(IWorkspace workspace, IFeatureDataset featureDataset, string featureClassName, IFields fields, ESRI.ArcGIS.esriSystem.UID CLSID, ESRI.ArcGIS.esriSystem.UID CLSEXT, string configKeyword)
{
IFeatureClass featureClass = null;
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace; // Explicit Cast
string shapeFieldName = String.Empty;
try
{
if (featureClassName == "")
{
return null; // name was not passed in
}
//else if (((IWorkspace2)workspace).get_NameExists(esriDatasetType.esriDTFeatureClass, featureClassName))
//{
// featureClass = featureWorkspace.OpenFeatureClass(featureClassName); // feature class with that name already exists
// return featureClass;
//}
// assign the class id value if not assigned
if (CLSID == null)
{
CLSID = new ESRI.ArcGIS.esriSystem.UIDClass();
CLSID.Value = "esriGeoDatabase.Feature";
}
// locate the shape field
for (Int32 j = 0; j < fields.FieldCount; j++)
{
if (fields.get_Field(j).Type == esriFieldType.esriFieldTypeGeometry)
{
shapeFieldName = fields.get_Field(j).Name;
}
}
// finally create and return the feature class
if (featureDataset == null)
{
// if no feature dataset passed in, create at the workspace level
featureClass = featureWorkspace.CreateFeatureClass(featureClassName, fields, CLSID, CLSEXT, esriFeatureType.esriFTSimple, shapeFieldName, configKeyword);
}
else
{
featureClass = featureDataset.CreateFeatureClass(featureClassName, fields, CLSID, CLSEXT, esriFeatureType.esriFTSimple, shapeFieldName, configKeyword);
}
}
catch (Exception ex)
{
Debug.Assert(false, ex.ToString());
Logger.Log.Debug(ex);
}
return featureClass;
}
Kode untuk mendapatkan lapisan
/// <summary>
/// Finds the layer
/// </summary>
/// <returns>the subcatchment layer</returns>
private IGeoFeatureLayer GetLayer(FeatureLayerClass featureLayer)
{
IGeoFeatureLayer layer = null;
ILayerExtensions layerExtension;
for (int x = 0; x < MapControl.LayerCount; x++)
{
layerExtension = ((ILayerExtensions)MapControl.get_Layer(x));
if (featureLayer.ExtensionCount > 0 && layerExtension.ExtensionCount > 0 &&
layerExtension.get_Extension(0) is PropertySetClass &&
featureLayer.get_Extension(0) is PropertySetClass &&
((PropertySetClass)layerExtension.get_Extension(0)).GetProperty("Id") == ((PropertySetClass)featureLayer.get_Extension(0)).GetProperty("Id"))
{
layer = MapControl.get_Layer(x) as IGeoFeatureLayer;
break;
}
}
return layer;
}
Terima kasih dan salam, Kevin