RegionBinderHelper.cs

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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
 
namespace Dreamine.MVVM.Locators.Wpf
{
    public static class RegionBinderHelper
    {
        public static ContentControl? FindRegionControl(DependencyObject root, string regionName)
        {
            ArgumentNullException.ThrowIfNull(root);
 
            if (string.IsNullOrWhiteSpace(regionName))
            {
                throw new ArgumentException("Region name must not be empty.", nameof(regionName));
            }
 
            int childCount = VisualTreeHelper.GetChildrenCount(root);
            for (int i = 0; i < childCount; i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(root, i);
 
                if (child is ContentControl contentControl &&
                    string.Equals(RegionBinder.GetRegionName(contentControl), regionName, StringComparison.Ordinal))
                {
                    return contentControl;
                }
 
                ContentControl? result = FindRegionControl(child, regionName);
                if (result is not null)
                {
                    return result;
                }
            }
 
            return null;
        }
    }
}