TreeView.TreeViewNodeSorter Propriété

Définition

Espace de noms:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Obtient ou définit l'implémentation de IComparer pour exécuter un tri personnalisé des nœuds TreeView.

public:
 property System::Collections::IComparer ^ TreeViewNodeSorter { System::Collections::IComparer ^ get(); void set(System::Collections::IComparer ^ value); };

[System.ComponentModel.Browsable(false)]
public System.Collections.IComparer TreeViewNodeSorter { get; set; }

[<System.ComponentModel.Browsable(false)>]
member this.TreeViewNodeSorter : System.Collections.IComparer with get, set

Public Property TreeViewNodeSorter As IComparer

Valeur de propriété

IComparer

IComparer pour exécuter le tri personnalisé.

Attributs

BrowsableAttribute

Exemples

L’exemple de code suivant montre comment utiliser la TreeViewNodeSorter propriété pour trier les nœuds du plus petit au plus grand. Pour exécuter cet exemple, collez le code suivant dans un Windows Form et appelez InitializeTreeView1 à partir du constructeur ou Load du gestionnaire d’événements du formulaire.

    // Create a node sorter that implements the IComparer interface.
private:
    ref class NodeSorter : public IComparer
    {
        // Compare the length of the strings, or the strings
        // themselves, if they are the same length.
    public:
        virtual int Compare(Object^ x, Object^ y)
        {
            TreeNode^ tx = (TreeNode^)x;
            TreeNode^ ty = (TreeNode^)y;

            // Compare the length of the strings, returning the difference.
            if (tx->Text->Length != ty->Text->Length)
            {
                return (tx->Text->Length - ty->Text->Length);
            }

            // If they are the same length, call Compare.
            return String::Compare(tx->Text, ty->Text);
        }
    };

    // Declare the TreeView.
private:
    TreeView^ initialTreeView;
private:
    TextBox^ displayNodes;
private:
    Button^ setSorter;

private:
    void InitializeInitialTreeView()
    {
        // Create the TreeView
        initialTreeView = gcnew TreeView();
        initialTreeView->Size = System::Drawing::Size(200, 200);

        // Create the button and set some basic properties.
        setSorter = gcnew Button();
        setSorter->Location = Point(205, 138);
        setSorter->Text = "Set Sorter";

        // Handle the click event for the button.
        setSorter->Click += gcnew EventHandler(this, 
            &TreeViewWhidbeyMembersExample::SetSorter_Click);

        // Create the root nodes.
        TreeNode^ docNode = gcnew TreeNode("Documents");
        TreeNode^ spreadSheetNode = gcnew TreeNode("Spreadsheets");

        // Add some additional nodes.
        spreadSheetNode->Nodes->Add("payroll.xls");
        spreadSheetNode->Nodes->Add("checking.xls");
        spreadSheetNode->Nodes->Add("tracking.xls");
        docNode->Nodes->Add("phoneList.doc");
        docNode->Nodes->Add("resume.doc");

        // Add the root nodes to the TreeView.
        initialTreeView->Nodes->Add(spreadSheetNode);
        initialTreeView->Nodes->Add(docNode);

        // Add the TreeView to the form.
        this->Controls->Add(initialTreeView);
        this->Controls->Add(setSorter);
    }

    // Set the TreeViewNodeSorter property to a new instance
    // of the custom sorter.
private:
    void SetSorter_Click(Object^ sender, EventArgs^ e)
    {
        initialTreeView->TreeViewNodeSorter = gcnew NodeSorter();
    }

// Declare the TreeView.
private TreeView treeView1;
private TextBox textBox1;
private Button button1;

private void InitializeTreeView1()
{
    // Create the TreeView
    treeView1 = new TreeView();
    treeView1.Size = new Size(200, 200);

    // Create the button and set some basic properties. 
    button1 = new Button();
    button1.Location = new Point(205, 138);
    button1.Text = "Set Sorter";

    // Handle the click event for the button.
    button1.Click += new EventHandler(button1_Click);

    // Create the root nodes.
    TreeNode docNode = new TreeNode("Documents");
    TreeNode spreadSheetNode = new TreeNode("Spreadsheets");

    // Add some additional nodes.
    spreadSheetNode.Nodes.Add("payroll.xls");
    spreadSheetNode.Nodes.Add("checking.xls");
    spreadSheetNode.Nodes.Add("tracking.xls");
    docNode.Nodes.Add("phoneList.doc");
    docNode.Nodes.Add("resume.doc");

    // Add the root nodes to the TreeView.
    treeView1.Nodes.Add(spreadSheetNode);
    treeView1.Nodes.Add(docNode);

    // Add the TreeView to the form.
    Controls.Add(treeView1);
    Controls.Add(button1);
}

// Set the TreeViewNodeSorter property to a new instance
// of the custom sorter.
private void button1_Click(object sender, EventArgs e)
{
    treeView1.TreeViewNodeSorter = new NodeSorter();
}

// Create a node sorter that implements the IComparer interface.
public class NodeSorter : IComparer
{
    // Compare the length of the strings, or the strings
    // themselves, if they are the same length.
    public int Compare(object x, object y)
    {
        TreeNode tx = x as TreeNode;
        TreeNode ty = y as TreeNode;

        // Compare the length of the strings, returning the difference.
        if (tx.Text.Length != ty.Text.Length)
            return tx.Text.Length - ty.Text.Length;

        // If they are the same length, call Compare.
        return string.Compare(tx.Text, ty.Text);
    }
}

' Declare the TreeView.
Private WithEvents treeView1 As TreeView
Private textBox1 As TextBox
Private WithEvents button1 As Button


Private Sub InitializeTreeView1()

    ' Create the TreeView
    treeView1 = New TreeView()
    treeView1.Size = New Size(200, 200)

    ' Create the button and set some basic properties. 
    button1 = New Button()
    button1.Location = New Point(205, 138)
    button1.Text = "Set Sorter"

    ' Create the root nodes.
    Dim docNode As New TreeNode("Documents")
    Dim spreadSheetNode As New TreeNode("Spreadsheets")

    ' Add some additional nodes.
    spreadSheetNode.Nodes.Add("payroll.xls")
    spreadSheetNode.Nodes.Add("checking.xls")
    spreadSheetNode.Nodes.Add("tracking.xls")
    docNode.Nodes.Add("phoneList.doc")
    docNode.Nodes.Add("resume.doc")

    ' Add the root nodes to the TreeView.
    treeView1.Nodes.Add(spreadSheetNode)
    treeView1.Nodes.Add(docNode)

    ' Add the TreeView to the form.
    Controls.Add(treeView1)
    Controls.Add(button1)

End Sub


' Set the TreeViewNodeSorter property to a new instance
' of the custom sorter.
Private Sub button1_Click(ByVal sender As Object, _
    ByVal e As EventArgs) Handles button1.Click

    treeView1.TreeViewNodeSorter = New NodeSorter()

End Sub

' Create a node sorter that implements the IComparer interface.

Public Class NodeSorter
    Implements IComparer
    
    ' Compare the length of the strings, or the strings
    ' themselves, if they are the same length.
    Public Function Compare(ByVal x As Object, ByVal y As Object) _
        As Integer Implements IComparer.Compare
        Dim tx As TreeNode = CType(x, TreeNode)
        Dim ty As TreeNode = CType(y, TreeNode)
       
        If tx.Text.Length <> ty.Text.Length Then
            Return tx.Text.Length - ty.Text.Length
        End If
        Return String.Compare(tx.Text, ty.Text)

    End Function
End Class

Remarques

Le tri personnalisé est appliqué lorsque est TreeViewNodeSorter défini.

Si une TreeNode étiquette est modifiée, vous pouvez appeler la Sort méthode pour trier à nouveau les éléments avec le trieur personnalisé spécifié par la TreeViewNodeSorter propriété .

Notes

Le trieur par défaut utilise la Compare méthode basée sur le CurrentCulture spécifié par l’application. Cela signifie que TreeNode les objets de valeur égale sont conservés dans l’ordre dans lequel ils ont été ajoutés au TreeView contrôle. Ce comportement peut être différent si un tri personnalisé est appliqué.

Voir aussi

• IComparer