TreeNode.PrevNode TreeNode.PrevNode TreeNode.PrevNode TreeNode.PrevNode Property

定義

取得上一個同層級樹狀節點。Gets the previous sibling tree node.

public:
 property System::Windows::Forms::TreeNode ^ PrevNode { System::Windows::Forms::TreeNode ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.TreeNode PrevNode { get; }
member this.PrevNode : System.Windows.Forms.TreeNode
Public ReadOnly Property PrevNode As TreeNode

屬性值

TreeNode,表示上一個同層級樹狀節點。A TreeNode that represents the previous sibling tree node.

範例

下列程式碼範例會在決定TreeNode是否選取了傳入TreeNode的之後,再TreeNode選取適當的。The following code example selects the appropriate TreeNode after determining if the TreeNode passed in is selected and which TreeNode to select. 這個Form範例要求您的具有TreeView具有包含多個TreeNode物件之的TreeNodeCollection控制項。This example requires that you have a Form with a TreeView control that has a TreeNodeCollection that contains several TreeNode objects. 此外,您也需要具有ComboBox具有下列專案的:[上一步]、[PreviousVisible]、[下一步]、[NextVisible]、[第一個] 和 [最後一步]。It also requires that you have a ComboBox with the following items: "Previous", "PreviousVisible", "Next", "NextVisible", "First", and "Last".

void SelectNode( TreeNode^ node )
{
   if ( node->IsSelected )
   {
      
      // Determine which TreeNode to select.
      String^ str = myComboBox->Text;
      if ( str->Equals( "Previous" ) )
               node->TreeView->SelectedNode = node->PrevNode;
      else
      if ( str->Equals( "PreviousVisible" ) )
               node->TreeView->SelectedNode = node->PrevVisibleNode;
      else
      if ( str->Equals( "Next" ) )
               node->TreeView->SelectedNode = node->NextNode;
      else
      if ( str->Equals( "NextVisible" ) )
               node->TreeView->SelectedNode = node->NextVisibleNode;
      else
      if ( str->Equals( "First" ) )
               node->TreeView->SelectedNode = node->FirstNode;
      else
      if ( str->Equals( "Last" ) )
               node->TreeView->SelectedNode = node->LastNode;
   }

   node->TreeView->Focus();
}
private void SelectNode(TreeNode node)
{
	if(node.IsSelected)
	{
		// Determine which TreeNode to select.
		switch(myComboBox.Text)
		{
			case "Previous":
				node.TreeView.SelectedNode = node.PrevNode;
				break;
			case "PreviousVisible":
				node.TreeView.SelectedNode = node.PrevVisibleNode;
				break;
			case "Next":
				node.TreeView.SelectedNode = node.NextNode;
				break;
			case "NextVisible":
				node.TreeView.SelectedNode = node.NextVisibleNode;
				break;
			case "First":
				node.TreeView.SelectedNode = node.FirstNode;
				break;
			case "Last":
				node.TreeView.SelectedNode = node.LastNode;
				break;
		}
	}
	node.TreeView.Focus();
}
Private Sub SelectNode(node As TreeNode)
   If node.IsSelected Then
      ' Determine which TreeNode to select.
      Select Case myComboBox.Text
         Case "Previous"
            node.TreeView.SelectedNode = node.PrevNode
         Case "PreviousVisible"
            node.TreeView.SelectedNode = node.PrevVisibleNode
         Case "Next"
            node.TreeView.SelectedNode = node.NextNode
         Case "NextVisible"
            node.TreeView.SelectedNode = node.NextVisibleNode
         Case "First"
            node.TreeView.SelectedNode = node.FirstNode
         Case "Last"
            node.TreeView.SelectedNode = node.LastNode
      End Select
   End If
   node.TreeView.Focus()
End Sub

備註

TreeNodeCollection 是儲存Nodes在樹狀節點TreeNode 父系TreeNode之屬性中的上一個同級。 PrevNodeThe PrevNode is the previous sibling TreeNode in the TreeNodeCollection stored in the Nodes property of the tree node's parent TreeNode. 如果沒有上一個樹狀節點,則PrevNode null屬性會傳回。If there is no previous tree node, the PrevNode property returns null.

適用於

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