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//-----------------------------------------------------------------------
// <copyright file="EmptyEnumerator.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.Messaging {
using System.Collections;
/// <summary>
/// An enumerator that always generates zero elements.
/// </summary>
internal class EmptyEnumerator : IEnumerator {
/// <summary>
/// The singleton instance of this empty enumerator.
/// </summary>
internal static readonly EmptyEnumerator Instance = new EmptyEnumerator();
/// <summary>
/// Prevents a default instance of the <see cref="EmptyEnumerator"/> class from being created.
/// </summary>
private EmptyEnumerator() {
}
#region IEnumerator Members
/// <summary>
/// Gets the current element in the collection.
/// </summary>
/// <value></value>
/// <returns>
/// The current element in the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">
/// The enumerator is positioned before the first element of the collection or after the last element.
/// </exception>
public object Current {
get { return null; }
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element; false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">
/// The collection was modified after the enumerator was created.
/// </exception>
public bool MoveNext() {
return false;
}
/// <summary>
/// Sets the enumerator to its initial position, which is before the first element in the collection.
/// </summary>
/// <exception cref="T:System.InvalidOperationException">
/// The collection was modified after the enumerator was created.
/// </exception>
public void Reset() {
}
#endregion
}
}
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