topic IWorkspaceFactory, IWorkspace how to open feature class? in ArcObjects SDK Questions

IWorkspaceFactory, IWorkspace how to open feature class?

JoseSanchez — Fri, 17 Aug 2018 13:12:20 GMT

Hello everyone,

I am currently opening an SDE feature class using "OpenFeatureClassFromString"

pathOutput = "C:\\SDEConnections\\EditingDatabase.sde\\FeatureDataset\\FeatureClass"

Dim pFeatureClass As IFeatureClass

pFeatureClass = gputilities.OpenFeatureClassFromString(pathOutput)

I would like to open a IWorkspaceFactory and a IWorkSpace and then open the feature class from the workspace.

Dim WorkspaceFactory As IWorkspaceFactory = New WorkspaceFactory()

Dim Workspace As IWorkspace = WorkspaceFactory.OpenFromFile(pathWorkspaceOutput, 0)

????

Thanks

Re: IWorkspaceFactory, IWorkspace how to open feature class?

FrankHellwich1 — Sun, 12 Dec 2021 16:02:41 GMT

Hi,

first you should open your sde-workspace and then cast this workspace to IFeatureWorkspace to open your feature class.

1.) open Workspace: (Connecting to a workspace using IPropertySet )

public IWorkspace open_ArcSDE_Workspace(string server, string instance, string user,
string password, string database, string version)
{
ESRI.ArcGIS.esriSystem.IPropertySet propertySet = new ESRI.ArcGIS.esriSystem.PropertySetClass();
propertySet.SetProperty("SERVER", server);
propertySet.SetProperty("INSTANCE", instance);
propertySet.SetProperty("DATABASE", database);
propertySet.SetProperty("USER", user);
propertySet.SetProperty("PASSWORD", password);
propertySet.SetProperty("VERSION", version);

IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesGDB.SdeWorkspaceFactoryClass();
return workspaceFactory.Open(propertySet, 0); 
}

2.) open feature class

IFeatureClass pFClass = ((IFeatureWorkspace)mySdeWorkspace).OpenFeatureClass(name);

Re: IWorkspaceFactory, IWorkspace how to open feature class?

JoseSanchez — Fri, 17 Aug 2018 16:42:33 GMT

How do you write this line in vb.net:

IFeatureClass pFClass = ((IFeatureWorkspace)mySdeWorkspace).OpenFeatureClass(name);

Re: IWorkspaceFactory, IWorkspace how to open feature class?

FrankHellwich1 — Sat, 11 Dec 2021 07:06:02 GMT

Hello Jose,

I'm no vb.net-guru but I think casting in vb.net is done by using DirectCast/TryCast:

1. if you're sure that casting will succeed (otherwise it throws an exception so use an exception handler) use DirectCast:

Dim pFWsp as IFeatureWorkspace= DirectCast(mySdeWorkspace, IFeatureWorkspace)
Dim pFClass as IFeatureClass = pFWsp.OpenFeatureClass(name) 
‍‍‍

2. if you're not sure - use TryCast

Dim pFWsp as IFeatureWorkspace= TryCast(mySdeWorkspace, IFeatureWorkspace)
if pFWsp IsNot Nothing then
   Dim pFClass as IFeatureClass = pFWsp.OpenFeatureClass(name) 
   ...
End if‍‍‍‍‍

Re: IWorkspaceFactory, IWorkspace how to open feature class?

JoseSanchez — Mon, 20 Aug 2018 11:58:59 GMT

i Frank,

This is how I did it:

Dim muWorkspaceEdit As IMultiuserWorkspaceEdit = CType(pFeatureWorkspace, IMultiuserWorkspaceEdit)

Dim pworkspaceEdit As IWorkspaceEdit = CType(pFeatureWorkspace, IWorkspaceEdit)