C# PropertyDescriptor类代码示例

		public void Initialize (PropertyDescriptor prop)
		{
			if (prop.PropertyType != typeof(int))
				throw new ApplicationException ("OptIntRange editor does not support editing values of type " + prop.PropertyType);

			double min = (double) Int32.MinValue;
			double max = (double) Int32.MaxValue;
			
			if (omin == null)
				omin = prop.Minimum;
			if (omax == null)
				omax = prop.Maximum;
			
			if (omin != null)
				min = (double) Convert.ChangeType (omin, typeof(double));
			if (omax != null)
				max = (double) Convert.ChangeType (omax, typeof(double));
			
			check = new Gtk.CheckButton ();
			check.Show ();
			check.Toggled += check_Toggled;
			PackStart (check, false, false, 0);

			spin = new Gtk.SpinButton (min, max, 1.0);
			spin.Show ();
			spin.HasFrame = false;
			spin.ValueChanged += spin_ValueChanged;
			PackStart (spin, true, true, 0);
		}

		public override IEnumerable<IPropertyDescriptor> GetProperties(Type type, object container)
		{
			return innerTypeDescriptor.GetProperties(type, container)
				.Where(p => p.GetCustomAttribute<YamlIgnoreAttribute>() == null)
				.Select(p =>
				{
					var descriptor = new PropertyDescriptor(p);

					var alias = p.GetCustomAttribute<YamlAliasAttribute>();
					if (alias != null)
					{
						descriptor.Name = alias.Alias;
					}

					var member = p.GetCustomAttribute<YamlMemberAttribute>();
					if (member != null)
					{
						if (member.SerializeAs != null)
						{
							descriptor.TypeOverride = member.SerializeAs;
						}
					}

					return (IPropertyDescriptor)descriptor;
				});
		}

		protected override void GeneratePropertySet (GeneratorContext ctx, CodeExpression var, PropertyDescriptor prop)
		{
			if (prop.Name == "Alpha" && Alpha == -1)
				return;
			else
				base.GeneratePropertySet (ctx, var, prop);
		}

		/// <summary>
		/// Initializes a new instance of the <see cref="PropertyDescriptor"/> class
		/// with an existing property descriptor.
		/// </summary>
		/// <param name="other">The other descriptor.</param>
		public PropertyDescriptor(PropertyDescriptor other)
		{
			property = other.property;
			AddKeyBuilders(other.keyBuilders);
			AddGetters(other.getters);
			AddSetters(other.setters);
		}

 /// <summary>
 ///     Creates a new ExtenderProvidedPropertyAttribute.
 /// </summary>
 internal static ExtenderProvidedPropertyAttribute Create(PropertyDescriptor extenderProperty, Type receiverType, IExtenderProvider provider)
 {
     ExtenderProvidedPropertyAttribute e = new ExtenderProvidedPropertyAttribute();
     e._extenderProperty = extenderProperty;
     e._receiverType = receiverType;
     e._provider = provider;
     return e;
 }

        public override bool DefineOwnProperty(string propertyName, PropertyDescriptor desc, bool throwOnError)
        {
            if (throwOnError)
            {
                throw new JavaScriptException(Engine.TypeError, "Can't define a property of a NamespaceReference");
            }

            return false;
        }

 public PropertyDescriptor(PropertyDescriptor descriptor)
 {
     Get = descriptor.Get;
     Set = descriptor.Set;
     Value = descriptor.Value;
     Enumerable = descriptor.Enumerable;
     Configurable = descriptor.Configurable;
     Writable = descriptor.Writable;
 }

		bool IDictionaryPropertySetter.SetPropertyValue(
			IDictionaryAdapterFactory factory, IDictionary dictionary,
			string key, ref object value, PropertyDescriptor property)
		{
			if (value != null)
			{
				value = GetPropertyAsString(property, value);
			}
			return true;
		}

		public override void Initialize (PropertyDescriptor prop)
		{
			base.Initialize (prop);
			
			entry = new Gtk.Entry ();
			entry.HasFrame = false;
			entry.Show ();
			entry.Changed += EntryChanged;
			Add (entry);
		}

		protected void NotifyPropertyChanged(PropertyDescriptor property, object oldValue, object newValue)
		{
			if (property.SuppressNotifications)
				return;

			var propertyChanged = PropertyChanged;
			if (propertyChanged == null)
				return;

			propertyChanged(this, new PropertyChangedEventArgsEx(property.PropertyName, oldValue, newValue));
		}

		private List<Expression> BuildColumnConstraints(PropertyDescriptor propertyDescriptor, PropertyDescriptor foreignKeyReferencingProperty)
		{
			var retval = new List<Expression>();

			if (foreignKeyReferencingProperty != null)
			{
				var valueRequiredAttribute = foreignKeyReferencingProperty.ValueRequiredAttribute;

				if (foreignKeyReferencingProperty.HasUniqueAttribute && foreignKeyReferencingProperty.UniqueAttribute.Unique)
				{
					retval.Add(new SqlSimpleConstraintExpression(SqlSimpleConstraint.Unique));
				}

				if (valueRequiredAttribute != null && valueRequiredAttribute.Required)
				{
					retval.Add(new SqlSimpleConstraintExpression(SqlSimpleConstraint.NotNull));
				}
			}
			else
			{
				if (propertyDescriptor.PropertyType.IsNullableType() || !propertyDescriptor.PropertyType.IsValueType)
				{
					var valueRequiredAttribute = propertyDescriptor.ValueRequiredAttribute;

					if (valueRequiredAttribute != null && valueRequiredAttribute.Required)
					{
						retval.Add(new SqlSimpleConstraintExpression(SqlSimpleConstraint.NotNull));
					}
				}
				else
				{
					retval.Add(new SqlSimpleConstraintExpression(SqlSimpleConstraint.NotNull));
				}

				if (propertyDescriptor.IsAutoIncrement && propertyDescriptor.PropertyType.IsIntegerType(true))
				{
					retval.Add(new SqlSimpleConstraintExpression(SqlSimpleConstraint.AutoIncrement, value: new object[] { propertyDescriptor.AutoIncrementAttribute.Seed, propertyDescriptor.AutoIncrementAttribute.Step }));
				}

				if (propertyDescriptor.HasUniqueAttribute && propertyDescriptor.UniqueAttribute.Unique)
				{
					retval.Add(new SqlSimpleConstraintExpression(SqlSimpleConstraint.Unique));
				}
				
				var defaultValueAttribute = propertyDescriptor.DefaultValueAttribute;

				if (defaultValueAttribute != null)
				{
					retval.Add(new SqlSimpleConstraintExpression(SqlSimpleConstraint.DefaultValue, null, defaultValueAttribute.Value));
				}
			}

			return retval;
		}

		private void ApplyValidationRules(IDictionaryAdapter dictionaryAdapter, IEnumerable<IValidationRule> rules,
										  PropertyDescriptor property, object propertyValue, IList<String> errors)
		{
			if (rules != null)
			{
				foreach (var rule in rules)
				{
					rule.Apply(dictionaryAdapter, property, propertyValue, errors);
				}
			}
		}

		public string Validate(IDictionaryAdapter dictionaryAdapter, PropertyDescriptor property)
		{
			List<String> errors = new List<string>();
			var globalRules = AttributesUtil.GetTypeAttributes<IValidationRule>(dictionaryAdapter.Meta.Type);

			var propertyRules = AttributesUtil.GetAttributes<IValidationRule>(property.Property);
			var propertyValue = dictionaryAdapter.GetProperty(property.PropertyName, true);
			ApplyValidationRules(dictionaryAdapter, propertyRules, property, propertyValue, errors);
			ApplyValidationRules(dictionaryAdapter, globalRules, property, propertyValue, errors);

			return String.Join(Environment.NewLine, errors.ToArray());
		}

		public void Initialize (PropertyDescriptor prop)
		{
			if (!prop.PropertyType.IsEnum)
				throw new ApplicationException ("Flags editor does not support editing values of type " + prop.PropertyType);
				
			property = prop.Label;
			Spacing = 3;

			// For small enums, the editor is a list of checkboxes inside a frame
			// For large enums (>5), use a selector dialog.

			enm = Registry.LookupEnum (prop.PropertyType.FullName);
			
			if (enm.Values.Length < 6) 
			{
				Gtk.VBox vbox = new Gtk.VBox (true, 3);

				flags = new Hashtable ();

				foreach (Enum value in enm.Values) {
					EnumValue eval = enm[value];
					if (eval.Label == "")
						continue;

					Gtk.CheckButton check = new Gtk.CheckButton (eval.Label);
					check.TooltipText = eval.Description;
					uint uintVal = (uint) Convert.ToInt32 (eval.Value);
					flags[check] = uintVal;
					flags[uintVal] = check;
					
					check.Toggled += FlagToggled;
					vbox.PackStart (check, false, false, 0);
				}

				Gtk.Frame frame = new Gtk.Frame ();
				frame.Add (vbox);
				frame.ShowAll ();
				PackStart (frame, true, true, 0);
			} 
			else 
			{
				flagsLabel = new Gtk.Entry ();
				flagsLabel.IsEditable = false;
				flagsLabel.HasFrame = false;
				flagsLabel.ShowAll ();
				PackStart (flagsLabel, true, true, 0);
				
				Gtk.Button but = new Gtk.Button ("...");
				but.Clicked += OnSelectFlags;
				but.ShowAll ();
				PackStart (but, false, false, 0);
			}
		}

		public void Initialize (PropertyDescriptor descriptor)
		{
			store = new ListStore (typeof(Pixbuf), typeof(string));
			Model = store;
			store.SetSortColumnId (1, SortType.Ascending);
			CellRendererPixbuf crp = new CellRendererPixbuf ();
			CellRendererText crt = new CellRendererText ();
			PackStart (crp, false);
			PackStart (crt, true);
			SetAttributes (crp, "pixbuf", 0);
			SetAttributes (crt, "text", 1);
		}