Features in a File Geodatabase Search. Pro SDK

[MatthewDriscoll]

Is there a way to see if a feature class exists in a file geodatabase OR loop through and get a list of all the feature class in a file geodatabase using the Pro SDK?

[RichRuh · Accepted solution]

Matthew,

I assume you are asking about feature classes inside a file geodatabase (a feature layer is a map layer that obtains its data from a feature class).  The best way to check for feature class existence is the following:

public bool FeatureClassExists(Geodatabase geodatabase, string featureClassName)
{
  try
  {
    FeatureClassDefinition featureClassDefinition = geodatabase.GetDefinition<FeatureClassDefinition(featureClassName);
    featureClassDefinition.Dispose();
    return true;
  }
  catch
  {
    // GetDefinition throws an exception if the definition doesn't exist
    return false;
  }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

To get a list of all of the feature classes in a geodatabase, use Geodatabase.GetDefinitions<FeatureClass>() and iterate through the returned list.

I hope this helps,

--Rich

[MatthewDriscoll]

Thanks Rich!

I did mean feature class, I corrected the question.  When I tried your suggestion I get the error "Non-invocable member ;FeatureClassDefinition' cannot be used like a method.  Below is what I ended up trying, it runs without error, but it still does not see the feature class when it does exist.

string projGDBPath = Project.Current.DefaultGeodatabasePath;

string FC = TXB.Text; // From a text box in the xaml
            
string fcFINAL = System.IO.Path.Combine(projGDBPath, FC);
            

await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() => {
                using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(projGDBPath))))
                {
                    try
                    {
                        FeatureClassDefinition featureClassDefinition = geodatabase.GetDefinition<FeatureClassDefinition>(fcFINAL);
                        featureClassDefinition.Dispose();
                        ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("It exists");
                    }

                    catch
                    {
                        ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("It Does Not Exist");
                    }
                }
            });‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

[RichRuh]

Ah, looks like I forgot the closing > in my code snippet.

I would suggest you get all of the feature class definitions inside the file geodatabase and make sure the list matches your expectations.  To do this call FeatureClass.GetDefinitions<FeatureClassDefinition>() and iterate through the returned list.

[MatthewDriscoll]

This does not seem to successfully get a list of the feature class either, it returns the definitions but not the actual name.  I cannot find any examples of doing this in the snippets or help either.    Probably going to switch to python to do this task, but I would like to avoid that because python takes a lot longer to run.

[RichRuh]

I'm not sure I understand.  Once you get the FeatureClassDefinition object, what is returned when you call FeatureClassDefinition.GetName()?

[RichRuh]

Are you sure you're looking at the right file geodatabase?  By default, the project workspace (Project.Current.DefaultGeodatabasePath), which is the file geodatabase that is automatically created when you create a project, *is* empty.  

By the way, going back to your original code snippet, you should call GetDefinition() with FC, not fcFinal.

[MatthewDriscoll]

This worked, calling just the name of the feature class and not the whole path.  I was wanting the default database.  Thank you for sticking with me Rich!