程序代码：

        /// <summary>
        /// Get/Set the message displayed to the user
        /// </summary>
        [Description("The message to display")]
        [Category("Parameters")]

程序代码：

    /// <summary>
    /// A simple activity that displays a message to the console when it executes
    /// </summary>
    [ActivityValidator(typeof(WriteLineValidator))]
    [Designer(typeof(WriteLineDesigner))]
    [ToolboxBitmap(typeof(WriteLineActivity),"Resources.WriteLine.png")]
    [ToolboxItem(typeof(WriteLineToolboxItem))]