业务流程图控件FlowChart.NET是一个通用的流程图控件，提供了用于创建或编辑图表的直观的用户交互模型。在上一篇文章创建自定义节点类型（一）和（二）中已经讲解了一些创建自定义节点类型的步骤，本教程将继续展示在FlowChart.NET如何创建自定义节点类型的步骤。

6、定义自定义属性

    定义自定义属性，比如IconNode定义属性实现图标和图像的标签。

C#

public Image Icon
{
    get { return icon; }
    set
    {
        icon = value;
        Bounds = new RectangleF(Bounds.Location, CalculateSize());
    }
}

public string Label
{
    get { return label; }
    set
    {
        label = value;
        Bounds = new RectangleF(Bounds.Location, CalculateSize());
    }
}

Visual Basic

Public Property Icon() As Image

    Get
        Return fIcon
    End Get

    Set(ByVal Value As Image)

        fIcon = Value
        Bounds = New RectangleF(Bounds.Location, CalculateSize())

    End Set

End Property

Public Property Label() As String

    Get
        Return fLabel
    End Get

    Set(ByVal Value As String)

        fLabel = Value
        Bounds = New RectangleF(Bounds.Location, CalculateSize())

    End Set

End Property

7、启用系列化

    为了使得自定义项目类型可以序列化，调用RegisterItemClass方法。比如要使得IconNode对象的序列化，就需要添加下面的来自构造函数的代码。

C#

// Enable serialization of IconNode instances
Diagram.RegisterItemClass(typeof(IconNode), "IconNode", 1);

Visual Basic

' Enable serialization of IconNode instances
Diagram.RegisterItemClass(GetType(IconNode), "IconNode", 1)