CIMTool for Windows Management Instrumentation - Part 1

namespace System.Windows.Controls.WpfPropertyGrid
{
  /// <summary>
  /// Specifies the editor to use to change the category.
  /// </summary>
  [AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface, AllowMultiple = true, Inherited = true)]  
  public sealed class CategoryEditorAttribute : Attribute
  {
    /// <summary>
    /// Gets or sets the type of the editor.
    /// </summary>
    /// <value>The type of the editor.</value>
    public string EditorType { get; private set; }

    /// <summary>
    /// Gets or sets the name of the category.
    /// </summary>
    /// <value>The name of the category.</value>
    public string CategoryName { get; private set; }

    /// <summary>
    /// Initializes a new instance of the <see cref="CategoryEditorAttribute"/> class.
    /// </summary>
    /// <param name="categoryName">Name of the category.</param>
    /// <param name="editorType">Type of the editor.</param>
    public CategoryEditorAttribute(string categoryName, string editorType)
    {
      if (string.IsNullOrEmpty(categoryName)) throw new ArgumentNullException("categoryName");
      if (string.IsNullOrEmpty(editorType)) throw new ArgumentNullException("editorType");
            
      EditorType = editorType;
      CategoryName = categoryName.ToUpperInvariant();
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="CategoryEditorAttribute"/> class.
    /// </summary>
    /// <param name="categoryName">Name of the category.</param>
    /// <param name="editorType">Type of the editor.</param>
    public CategoryEditorAttribute(string categoryName, Type editorType)
      : this(categoryName, editorType.AssemblyQualifiedName)
    {      
    }

    /// <summary>
    /// Returns the hash code for this instance.
    /// </summary>
    /// <returns>A 32-bit signed integer hash code.</returns>
    public override int GetHashCode()
    {
      return EditorType.GetHashCode() ^ CategoryName.GetHashCode();
    }

    /// <summary>
    /// Returns a value that indicates whether this instance is equal to a specified object.
    /// </summary>
    /// <param name="obj">An <see cref="T:System.Object"/> to compare with this instance or null.</param>
    /// <returns>
    /// true if <paramref name="obj"/> equals the type and value of this instance; otherwise, false.
    /// </returns>
    public override bool Equals(object obj)
    {
      if (obj == this) return true;

      var attribute = obj as CategoryEditorAttribute;
      return (attribute != null && attribute.EditorType == EditorType && attribute.CategoryName == CategoryName);
    }
  }
}