Cosmos/source2/VSIP/MPF/9.0/Src/CSharp/Automation/OANullProperty.cs

/// Copyright (c) Microsoft Corporation.  All rights reserved.

using System;
using System.Runtime.InteropServices;

namespace Microsoft.VisualStudio.Project.Automation
{
	/// <summary>
	/// This object defines a so called null object that is returned as instead of null. This is because callers in VSCore usually crash if a null propery is returned for them.
	/// </summary>
	[CLSCompliant(false), ComVisible(true)]
	public class OANullProperty : EnvDTE.Property
	{
		#region fields
		private OAProperties parent;
		#endregion

		#region ctors

		public OANullProperty(OAProperties parent)
		{
			this.parent = parent;
		}
		#endregion

		#region EnvDTE.Property

		public object Application
		{
			get { return String.Empty; }
		}

		public EnvDTE.Properties Collection
		{
			get
			{
				//todo: EnvDTE.Property.Collection
				return this.parent;
			}
		}

		public EnvDTE.DTE DTE
		{
			get { return null; }
		}

		public object get_IndexedValue(object index1, object index2, object index3, object index4)
		{
			return String.Empty;
		}

		public void let_Value(object value)
		{
			//todo: let_Value
		}

		public string Name
		{
			get { return String.Empty; }
		}

		public short NumIndices
		{
			get { return 0; }
		}

		public object Object
		{
			get { return this.parent.Target; }
			set
			{
			}
		}

		public EnvDTE.Properties Parent
		{
			get { return this.parent; }
		}

		public void set_IndexedValue(object index1, object index2, object index3, object index4, object value)
		{

		}

		public object Value
		{
			get { return String.Empty; }
			set { }
		}
		#endregion
	}
}