ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Data Namespace / Version Class / GetParent Method
Example Version

GetParent Method (Version)
Gets this version's parent version. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public Version GetParent()

Return Value

This version's parent version if it has a parent; otherwise, null.
Exceptions
ExceptionDescription
A geodatabase-related exception has occurred.
This method or property must be called within the lambda passed to QueuedTask.Run
Example
Reconciling and Posting a Version with its Parent in separate edit sessions
public void ReconcileAndPost(Geodatabase geodatabase)
{
    // Get a reference to our version and our parent
    if (geodatabase.IsVersioningSupported())
    {
        using (VersionManager versionManager = geodatabase.GetVersionManager())
        using (Version currentVersion = versionManager.GetCurrentVersion())
        using (Version parentVersion = currentVersion.GetParent())
        {

            //// Create a ReconcileDescription object
            //At 2.x - 
            //ReconcileDescription reconcileDescription = new ReconcileDescription(parentVersion);
            //reconcileDescription.ConflictResolutionMethod = ConflictResolutionMethod.Continue; // continue if conflicts are found
            //reconcileDescription.WithPost = true;

            //// Reconcile and post
            //ReconcileResult reconcileResult = currentVersion.Reconcile(reconcileDescription);

            // ReconcileResult.HasConflicts can be checked as-needed

            // Create a ReconcileOptions object
            ReconcileOptions reconcileOptions = new ReconcileOptions(parentVersion);
            reconcileOptions.ConflictResolutionMethod = ConflictResolutionMethod.Continue; // continue if conflicts are found
            reconcileOptions.ConflictDetectionType = ConflictDetectionType.ByRow; //Default
            reconcileOptions.ConflictResolutionType = ConflictResolutionType.FavorTargetVersion;//or FavorEditVersion

            // Reconcile
            ReconcileResult reconcileResult = currentVersion.Reconcile(reconcileOptions);
            if (!reconcileResult.HasConflicts)
            {
                //No conflicts, perform the post
                PostOptions postOptions = new PostOptions(parentVersion);
                //var postOptions = new PostOptions(); for default version
                postOptions.ServiceSynchronizationType = ServiceSynchronizationType.Synchronous;//Default
                currentVersion.Post(postOptions);
            }

        }
    }
}
Reconciling and Posting a Version with its Parent in the same edit session
public void ReconcileAndPost2(Geodatabase geodatabase)
{
    // Get a reference to our version and our parent
    if (geodatabase.IsVersioningSupported())
    {
        using (VersionManager versionManager = geodatabase.GetVersionManager())
        using (Version currentVersion = versionManager.GetCurrentVersion())
        using (Version parentVersion = currentVersion.GetParent())
        {

            //// Create a ReconcileDescription object
            //At 2.x - 
            //ReconcileDescription reconcileDescription = new ReconcileDescription(parentVersion);
            //reconcileDescription.ConflictResolutionMethod = ConflictResolutionMethod.Continue; // continue if conflicts are found
            //reconcileDescription.WithPost = true;

            //// Reconcile and post
            //ReconcileResult reconcileResult = currentVersion.Reconcile(reconcileDescription);

            // ReconcileResult.HasConflicts can be checked as-needed

            // Create a ReconcileOptions object
            ReconcileOptions reconcileOptions = new ReconcileOptions(parentVersion);
            reconcileOptions.ConflictResolutionMethod = ConflictResolutionMethod.Continue; // continue if conflicts are found
            reconcileOptions.ConflictDetectionType = ConflictDetectionType.ByRow; //Default
            reconcileOptions.ConflictResolutionType = ConflictResolutionType.FavorTargetVersion;//or FavorEditVersion

            PostOptions postOptions = new PostOptions(parentVersion);
            //var postOptions = new PostOptions(); for default version
            postOptions.ServiceSynchronizationType = ServiceSynchronizationType.Synchronous;//Default

            // Reconcile
            ReconcileResult reconcileResult = currentVersion.Reconcile(reconcileOptions, postOptions);
            if (reconcileResult.HasConflicts)
            {
                //TODO resolve conflicts

            }

        }
    }
}
Working with Versions
public async Task WorkingWithVersions()
{
    await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
    {
        using (Geodatabase geodatabase = new Geodatabase(new DatabaseConnectionFile(new Uri("path\\to\\sde\\file"))))
        using (VersionManager versionManager = geodatabase.GetVersionManager())
        {
            IReadOnlyList<string> versionNames = versionManager.GetVersionNames();

            Version defaultVersion = versionManager.GetDefaultVersion();

            string testVersionName = versionNames.First(v => v.Contains("Test"));
            Version testVersion= versionManager.GetVersion(testVersionName);

            Version qaVersion = defaultVersion.GetChildren().First(version => version.GetName().Contains("QA"));

            Geodatabase qaVersionGeodatabase = qaVersion.Connect();

            FeatureClass currentFeatureClass = geodatabase.OpenDataset<FeatureClass>("featureClassName");
            FeatureClass qaFeatureClass = qaVersionGeodatabase.OpenDataset<FeatureClass>("featureClassName");
        }
    });
}
Working with the Default Version
// Check to see if the current version is default.
// Works with both branch and traditional versioning.
public bool IsDefaultVersion(Version version)
{
    Version parentVersion = version.GetParent();
    if (parentVersion == null)
    {
        return true;
    }
    parentVersion.Dispose();
    return false;
}

public bool IsDefaultVersion(Geodatabase geodatabase)
{
    if (!geodatabase.IsVersioningSupported()) return false;
    using (VersionManager versionManager = geodatabase.GetVersionManager())
    using (Version currentVersion = versionManager.GetCurrentVersion())
    {
        return IsDefaultVersion(currentVersion);
    }
}

// Gets the default version.
// Works with both branch and traditional versioning.
// Note that this routine depends on IsDefaultVersion(), above.
public Version GetDefaultVersion(Version version)
{
    if (IsDefaultVersion(version))
    {
        return version;
    }
    else
    {
        Version parent = version.GetParent();
        Version ancestor = GetDefaultVersion(parent);
        if (parent != ancestor)
        {
            parent.Dispose(); //If the versioning tree is more than 2 deep, we want to dispose any intermediary versions
        }
        return ancestor;
    }
}

public Version GetDefaultVersion(Geodatabase geodatabase)
{
    if (!geodatabase.IsVersioningSupported()) return null;

    using (VersionManager versionManager = geodatabase.GetVersionManager())
    {
        Version currentVersion = versionManager.GetCurrentVersion();
        Version defaultVersion = GetDefaultVersion(currentVersion);
        if (currentVersion != defaultVersion)
        {
            currentVersion.Dispose(); // If we are not pointing to default, we want to dispose this Version object
        }
        return defaultVersion;
    }
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also