ELK/FrameworkLocal/UIClient/Caliburn.Micro/Core/IGuardClose.cs

namespace Caliburn.Micro.Core {
    using System;

    /// <summary>
    /// Denotes an instance which may prevent closing.
    /// </summary>
    public interface IGuardClose : IClose {
        /// <summary>
        /// Called to check whether or not this instance can close.
        /// </summary>
        /// <param name="callback">The implementer calls this action with the result of the close check.</param>
        void CanClose(Action<bool> callback);
    }
}