topic Re: Features in a File Geodatabase Search. Pro SDK in ArcGIS Pro SDK Questions

Features in a File Geodatabase Search. Pro SDK

MatthewDriscoll — Fri, 18 Jan 2019 20:43:53 GMT

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?

Re: Features in a File Geodatabase Search. Pro SDK

RichRuh — Sun, 12 Dec 2021 10:43:04 GMT

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

Re: Features in a File Geodatabase Search. Pro SDK

MatthewDriscoll — Sun, 12 Dec 2021 10:43:06 GMT

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");
                    }
                }
            });‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Features in a File Geodatabase Search. Pro SDK

RichRuh — Tue, 22 Jan 2019 15:50:29 GMT

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.

Re: Features in a File Geodatabase Search. Pro SDK

MatthewDriscoll — Tue, 22 Jan 2019 17:07:52 GMT

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.

Re: Features in a File Geodatabase Search. Pro SDK

RichRuh — Tue, 22 Jan 2019 17:47:55 GMT

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

Re: Features in a File Geodatabase Search. Pro SDK

RichRuh — Tue, 22 Jan 2019 18:36:58 GMT

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.

Re: Features in a File Geodatabase Search. Pro SDK

MatthewDriscoll — Tue, 22 Jan 2019 18:50:00 GMT

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!