TreeView.SelectedNode 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

获取或设置当前在树视图控件中选定的树节点。

public:
 property System::Windows::Forms::TreeNode ^ SelectedNode { System::Windows::Forms::TreeNode ^ get(); void set(System::Windows::Forms::TreeNode ^ value); };

[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.TreeNode SelectedNode { get; set; }

[<System.ComponentModel.Browsable(false)>]
member this.SelectedNode : System.Windows.Forms.TreeNode with get, set

Public Property SelectedNode As TreeNode

属性值

TreeNode

当前在树视图控件中选定的 TreeNode。

属性

BrowsableAttribute

示例

下面的代码示例设置 PathSeparator 的 TreeView 属性，并显示 包含在 TreeNodeCollection 的 SelectedNode中的子树节点数。 还会显示树视图控件中子树节点占树节点总数的百分比。 此示例要求具有 Form 的 Button，以及 TreeView 具有 TreeNodeCollection 的 控件，该控件具有多个 TreeNode 对象 (最好具有三个或更多级别) 。

void myButton_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{

   // Set the tree view's PathSeparator property.
   myTreeView->PathSeparator = ".";

   // Get the count of the child tree nodes contained in the SelectedNode.
   int myNodeCount = myTreeView->SelectedNode->GetNodeCount( true );
   Decimal myChildPercentage = ((Decimal)myNodeCount / (Decimal)myTreeView->GetNodeCount( true )) * 100;

   // Display the tree node path and the number of child nodes it and the tree view have.
   MessageBox::Show( String::Concat( "The '", myTreeView->SelectedNode->FullPath, "' node has ", myNodeCount, " child nodes.\nThat is ", String::Format( "{0:###.##}", myChildPercentage ), "% of the total tree nodes in the tree view control." ) );
}

private void myButton_Click(object sender, System.EventArgs e)
{
   // Set the tree view's PathSeparator property.
   myTreeView.PathSeparator = ".";

   // Get the count of the child tree nodes contained in the SelectedNode.
   int myNodeCount = myTreeView.SelectedNode.GetNodeCount(true);
   decimal myChildPercentage = ((decimal)myNodeCount/
     (decimal)myTreeView.GetNodeCount(true)) * 100;

   // Display the tree node path and the number of child nodes it and the tree view have.
   MessageBox.Show("The '" + myTreeView.SelectedNode.FullPath + "' node has "
     + myNodeCount.ToString() + " child nodes.\nThat is "
     + string.Format("{0:###.##}", myChildPercentage)
     + "% of the total tree nodes in the tree view control.");
}

Private Sub myButton_Click(ByVal sender As Object, _
  ByVal e As System.EventArgs) Handles myButton.Click
   ' Set the tree view's PathSeparator property.
   myTreeView.PathSeparator = "."

   ' Get the count of the child tree nodes contained in the SelectedNode.
   Dim myNodeCount As Integer = myTreeView.SelectedNode.GetNodeCount(True)
   Dim myChildPercentage As Decimal = CDec(myNodeCount) / _
      CDec(myTreeView.GetNodeCount(True)) * 100

   ' Display the tree node path and the number of child nodes it and the tree view have.
   MessageBox.Show(("The '" + myTreeView.SelectedNode.FullPath + "' node has " _
      + myNodeCount.ToString() + " child nodes." + Microsoft.VisualBasic.ControlChars.Lf _
      + "That is " + String.Format("{0:###.##}", myChildPercentage) _
      + "% of the total tree nodes in the tree view control."))
End Sub

注解

如果当前未 TreeNode 选择 ，则 SelectedNode 属性为 null。

设置此属性时，指定的节点将滚动到视图中，并展开任何父节点，以便指定的节点可见。

当以编程方式或通过用户操作折叠所选节点的父节点或任何上级节点时，折叠的节点将成为所选节点。

另请参阅

• TreeNode