--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Common/NameOrIndexParameter.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,139 @@
+using System;
+using System.Linq;
+using BLToolkit.Properties;
+
+namespace BLToolkit.Common
+{
+	/// <summary>
+	/// This argument adapter class allows either names (strings) or
+	/// indices (ints) to be passed to a function.
+	/// </summary>
+	[System.Diagnostics.DebuggerStepThrough]
+	public struct NameOrIndexParameter
+	{
+		public NameOrIndexParameter(string name)
+		{
+			if (null == name)
+				throw new ArgumentNullException("name");
+
+			if (name.Length == 0)
+				throw new ArgumentException(Resources.NameOrIndexParameter_BadName, "name");
+
+			_name  = name;
+			_index = 0;
+		}
+
+		public NameOrIndexParameter(int index)
+		{
+			if (index < 0)
+				throw new ArgumentException(Resources.NameOrIndexParameter_BadIndex, "index");
+
+			_name  = null;
+			_index = index;
+		}
+
+		public static implicit operator NameOrIndexParameter(string name)
+		{
+			return new NameOrIndexParameter(name);
+		}
+
+		public static implicit operator NameOrIndexParameter(int index)
+		{
+			return new NameOrIndexParameter(index);
+		}
+
+		#region Public properties
+		
+		public bool ByName
+		{
+			get { return null != _name; }
+		}
+
+		private readonly string _name;
+		public           string  Name
+		{
+			get
+			{
+				if (null == _name)
+					throw new InvalidOperationException(
+						"This instance was initialized by index");
+				
+				 return _name;
+			}
+		}
+
+		private readonly int _index;
+		public           int  Index
+		{
+			get
+			{
+				if (null != _name)
+					throw new InvalidOperationException(
+						"This instance was initialized by name");
+
+				return _index;
+			}
+		}
+
+		#endregion
+
+		#region Static methods
+
+		public static NameOrIndexParameter[] FromStringArray(string[] names)
+		{
+			return names.Select(name => new NameOrIndexParameter(name)).ToArray();
+		}
+
+		public static NameOrIndexParameter[] FromIndexArray(int[] indices)
+		{
+			return indices.Select(index => new NameOrIndexParameter(index)).ToArray();
+		}
+
+		#endregion
+		
+		#region System.Object members
+
+		public override bool Equals(object obj)
+		{
+			if (obj is NameOrIndexParameter)
+			{
+				var nip = (NameOrIndexParameter)obj;
+
+				if (null != _name && null != nip._name && _name == nip._name)
+					return true; // Same name
+				
+				if (null == _name && null == nip._name && _index == nip._index)
+					return true; // Same index
+
+				return false;
+			}
+
+			if (obj is string)
+			{
+				var name = (string)obj;
+				return (null != _name && _name == name);
+			}
+
+			if (obj is int)
+			{
+				var index = (int)obj;
+				return (null == _name && _index == index);
+			}
+
+			return false;
+		}
+
+		public override int GetHashCode()
+		{
+			return (null != _name) ? _name.GetHashCode() : _index.GetHashCode();
+		}
+		
+		public override string ToString()
+		{
+			return _name ?? "#" + _index;
+		}
+
+		#endregion
+
+	}
+}