/// <summary>
        /// Returns the hash code for this TokenCacheKey.
        /// </summary>
        /// <returns>
        /// A 32-bit signed integer hash code.
        /// </returns>
        public override int GetHashCode()
        {
            const string Delimiter = ":::";

            return((this.Authority + Delimiter
                    + MsalHelpers.AsSingleString(this.Scope) + Delimiter
                    + this.ClientId.ToLower() + Delimiter
                    + this.UniqueId + Delimiter
                    + this.HomeObjectId + Delimiter
                    + ((this.DisplayableId != null) ? this.DisplayableId.ToLower() : null) + Delimiter
                    + ((this.Policy != null) ? this.Policy.ToLower() : null)).GetHashCode());
        }