CIMTool for Windows Management Instrumentation - Part 1

using System.Collections.Generic;

namespace System.Windows.Controls.WpfPropertyGrid
{
  /// <summary>
  /// Default <see cref="PropertyItem"/> comparer.
  /// </summary>
  public class PropertyItemComparer : IComparer<PropertyItem>
  {
    /// <summary>
    /// Compares two objects and returns a value indicating whether one is less than, equal to, or greater than the other.
    /// </summary>
    /// <param name="x">The first object to compare.</param>
    /// <param name="y">The second object to compare.</param>
    /// <returns>
    /// Value
    /// Condition
    /// Less than zero
    /// <paramref name="x"/> is less than <paramref name="y"/>.
    /// Zero
    /// <paramref name="x"/> equals <paramref name="y"/>.
    /// Greater than zero
    /// <paramref name="x"/> is greater than <paramref name="y"/>.
    /// </returns>
    public virtual int Compare(PropertyItem x, PropertyItem y)
    {
      if (x == y) return 0;
      if (x == null) return -1;
      if (y == null) return 1;

      int leftOrder = 0;

      var attribute = x.GetAttribute<PropertyOrderAttribute>();
      if (attribute != null)
        leftOrder = attribute.Order;

      int rightOrder = 0;

      attribute = y.GetAttribute<PropertyOrderAttribute>();
      if (attribute != null)
        rightOrder = attribute.Order;

      int num = (leftOrder == rightOrder) ? 0 : leftOrder.CompareTo(rightOrder);
      if (num != 0) return num;

      return string.Compare(x.Name, y.Name, true);
    }
  }
}