ContentFlowKey.cs

public class ContentFlowKey : DictionaryKey
{
    /// <summary>
    /// Gets or sets the timestamp.
    /// </summary>
    public DateTime Timestamp { get; set; }

    /// <summary>
    /// Gets or sets the contact id.
    /// </summary>
    public Guid ContactId { get; set; }

    /// <summary>
    /// Gets or sets the item id.
    /// </summary>
    public Guid ItemId { get; set; }

    /// <summary>
    /// Gets or sets the content type.
    /// </summary>
    public string ContentType { get; set; }

    /// <summary>
    /// Gets or sets the type.
    /// </summary>
    public string Type { get; set; }
}