ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Core.Data Namespace / Geodatabase Class / GetDefinition<T> Method
The type of dataset definition.
The name of the dataset.
Example

In This Topic
    GetDefinition<T> Method (Geodatabase)
    In This Topic
    Gets a specific Definition instance associated with name of type T in the geodatabase. This method must be called on the MCT. Use QueuedTask.Run.
    Syntax
    public T GetDefinition<T>( 
       string name
    )
    where T: Definition
    Public Function GetDefinition(Of T As Definition)( _
       ByVal name As String _
    ) As T

    Parameters

    name
    The name of the dataset.

    Type Parameters

    T
    The type of dataset definition.

    Return Value

    A specific Definition instance corresponding to type T.
    Exceptions
    ExceptionDescription

    No valid geodatabase has been opened prior to calling this operation.

    -or-

    The DatasetType corresponding to type T is not supported.

    name is invalid (e.g., a null value or an empty string).
    name does not exist or cannot be opened in the geodatabase.
    A geodatabase-related exception has occurred.
    Example
    Obtaining Definition from Geodatabase
    public async Task ObtainingDefinitionFromGeodatabase()
    {
      await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
      {
        using (Geodatabase geodatabase = new Geodatabase(new DatabaseConnectionFile(new Uri("path\\to\\sde\\file\\sdefile.sde"))))
        {
          // Remember that for Enterprise databases you have to qualify your dataset names with the DatabaseName and UserName.
          TableDefinition enterpriseTableDefinition = geodatabase.GetDefinition<TableDefinition>("LocalGovernment.GDB.CitizenContactInfo");
    
          // It does not matter if the dataset is within a FeatureDataset or not.
          FeatureClassDefinition featureClassDefinition = geodatabase.GetDefinition<FeatureClassDefinition>("LocalGovernment.GDB.FireStation");
    
          // GetDefinition For a RelationshipClass.
          RelationshipClassDefinition relationshipClassDefinition = geodatabase.GetDefinition<RelationshipClassDefinition>("LocalGovernment.GDB.AddressPointHasSiteAddresses");
    
          // GetDefinition For a FeatureDataset.
          FeatureDatasetDefinition featureDatasetDefinition = geodatabase.GetDefinition<FeatureDatasetDefinition>("LocalGovernment.GDB.Address");
        }
      });
    }
    Checking for the existence of a Table
    // Must be called within QueuedTask.Run9)
    public bool TableExists(Geodatabase geodatabase, string tableName)
    {
      try
      {
        TableDefinition tableDefinition = geodatabase.GetDefinition<TableDefinition>(tableName);
        tableDefinition.Dispose();
        return true;
      }
      catch
      {
        // GetDefinition throws an exception if the definition doesn't exist
        return false;
      }
    }
    Checking for the existence of a Feature Class
    // Must be called within QueuedTask.Run()
    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;
      }
    }
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also