MindFusion.Diagramming for WinForms是一個能幫助你創建工作流和進程圖表的.NET控件；數據庫實體關系圖表；組織圖表；對象層次和關系圖表；圖表和樹。它是基于對象－圖表框，表格和箭頭類型，將其歸類分派給其他并結合成復雜的結構。該控件提供超過預先定義的50多種圖表框，如自定義設計樣式和對圖表框著色等。MindFusion.Diagramming for WinForms現已加入在線訂購，現在搶購立享優惠，查看詳情>>

點擊下載MindFusion.Diagramming for WinForms最新試用版

本教程說明如何從XML加載圖形數據并創建與圖形節點和邊相對應的圖形對象。

1、在解決方案資源管理器中右鍵單擊該項目，然后從上下文菜單中選擇“添加”->“新建項”。 創建一個名為SampleTree.xml的新XML文件，并以以下形式添加內容：

XML

<?xml version="1.0" encoding="utf-8" ?> 
<Project>
    <Activity Name="Activity 1">
        <Activity  Name="sub-activity 1">
            <Activity  Name="sub-activity 1-1" />
            <Activity  Name="sub-activity 1-2" />
        </Activity>
        <Activity  Name="sub-activity 2">
            <Activity  Name="sub-activity 2-1" />
            <Activity  Name="sub-activity 2-2" />
            <Activity  Name="sub-activity 2-3" />
        </Activity>
        <Activity  Name="sub-activity 3">
            <Activity  Name="sub-activity 3-1" />
            <Activity  Name="sub-activity 3-2" />
        </Activity>
    </Activity>
    <Activity Name="Activity 2">
        <Activity  Name="sub-activity 1">
            <Activity  Name="sub-activity 1-1" />
            <Activity  Name="sub-activity 1-2" />
            <Activity  Name="sub-activity 1-3" />
        </Activity>
        <Activity  Name="sub-activity 2">
            <Activity  Name="sub-activity 2-1" />
            <Activity  Name="sub-activity 2-2" />
        </Activity>
    </Activity>
    <Activity Name="Activity 3">
        <Activity  Name="sub-activity 1">
            <Activity  Name="sub-activity 1-1" />
            <Activity  Name="sub-activity 1-2" />
            <Activity  Name="sub-activity 1-3" />
            <Activity  Name="sub-activity 1-4" />
        </Activity>
        <Activity  Name="sub-activity 2" />
        <Activity  Name="sub-activity 3">
            <Activity  Name="sub-activity 3-1" />
            <Activity  Name="sub-activity 3-2" />
        </Activity>
    </Activity>
</Project>

2、將文件的“生成操作”屬性設置為“內容”，將“復制到輸出目錄”設置為“如果更新則復制”。

3、覆蓋以下形式的OnLoad方法：

C#

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
}

Visual Basic

Protected Overrides Sub OnLoad(ByVal e As EventArgs)

    MyBase.OnLoad(e)

End Sub

4、添加窗口類的以下成員以保留默認節點大小。

C#

RectangleF nodeBounds = new RectangleF(0, 0, 24, 6);

Visual Basic

Dim nodeBounds As New RectangleF(0, 0, 24, 6)

5、創建樹的根節點，并調用CreateChildren方法，該方法以遞歸方式構建樹。

C#

ShapeNode root = diagram.Factory.CreateShapeNode(nodeBounds);
root.Text = "Project";
XmlDocument document = new XmlDocument();
document.Load("SampleTree.xml");
CreateChildren(root, document.SelectSingleNode("Project"));

Visual Basic

Dim root As ShapeNode = diagram.Factory.CreateShapeNode(nodeBounds)
root.Text = "Project"
Dim document As New XmlDocument()
document.Load("SampleTree.xml")
CreateChildren(root, document.SelectSingleNode("Project"))

6、如下定義CreateChildren。 它以父DiagramNode和父XML元素為參數，迭代子XML元素以構建層次結構的下一層，并通過調用CreateShapeNode和CreateDiagramLink創建相應的圖項目。

C#

private void CreateChildren(DiagramNode parentDiagNode, XmlNode parentXmlNode)
{
    foreach (XmlElement element in parentXmlNode.SelectNodes("Activity"))
    {
        ShapeNode node = diagram.Factory.CreateShapeNode(nodeBounds);
        node.Text = element.GetAttribute("Name");
        diagram.Factory.CreateDiagramLink(parentDiagNode, node);
        CreateChildren(node, element);
    }
}

Visual Basic

Private Sub CreateChildren(ByVal parentDiagNode As DiagramNode, ByVal parentXmlNode As XmlNode)

    For Each element As XmlElement In parentXmlNode.SelectNodes("Activity")

        Dim node As ShapeNode = diagram.Factory.CreateShapeNode(nodeBounds)
        node.Text = element.GetAttribute("Name")
        diagram.Factory.CreateDiagramLink(parentDiagNode, node)
        CreateChildren(node, element)

    Next

End Sub

7、使用TreeLayout排列圖。 將以下代碼添加到OnLoad覆蓋的末尾。

C#

TreeLayout layout = new TreeLayout();
layout.Type = TreeLayoutType.Cascading;
layout.Direction = TreeLayoutDirections.LeftToRight;
layout.LinkStyle = TreeLayoutLinkType.Cascading2;
layout.NodeDistance = 3;
layout.LevelDistance = -8; // let horizontal positions overlap
layout.Arrange(diagram);

Visual Basic

Dim layout As New TreeLayout()
layout.Type = TreeLayoutType.Cascading
layout.Direction = TreeLayoutDirections.LeftToRight
layout.LinkStyle = TreeLayoutLinkType.Cascading2
layout.NodeDistance = 3
layout.LevelDistance = -8
' let horizontal positions overlap
layout.Arrange(diagram)

8、生成并運行項目。 如果一切正常，您應該看到此層次結構的表示形式：