TreeList.AppendNode(Object, Int32, CheckState) Method

Appends a new node with the specified settings.

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v23.2.dll

NuGet Packages: DevExpress.Win.Navigation, DevExpress.Win.TreeList

Declaration

C#

public virtual TreeListNode AppendNode(
    object nodeData,
    int parentNodeId,
    CheckState checkState
)

VB.NET

Public Overridable Function AppendNode(
    nodeData As Object,
    parentNodeId As Integer,
    checkState As CheckState
) As TreeListNode

Parameters

Name	Type	Description
nodeData	Object	An array of values or a DataRow object, used to initialize the created node’s cells.
parentNodeId	Int32	An integer value that identifies the parent node.
checkState	CheckState	The node’s check state.

Returns

Type	Description
TreeListNode	A TreeListNode object that represents the added node.

Remarks

To learn more, see Nodes.

Example

The following code shows how to manually populate a TreeList control with nodes in unbound mode.

To add nodes in unbound mode, utilize the TreeList.AppendNode method. Data that is passed to this method must match the TreeList columns. So, the TreeList columns are created before the nodes are created.

Note that calls to the methods used to create nodes are wrapped with the TreeList.BeginUnboundLoad and TreeList.EndUnboundLoad methods. This reduces the control’s updates to a minimum, and thus improves performance.

The following image displays the result.

C#

using DevExpress.XtraTreeList;
using DevExpress.XtraTreeList.Columns;
using DevExpress.XtraTreeList.Nodes;

private void Form1_Load(object sender, EventArgs e) {
    CreateColumns(treeList1);
    CreateNodes(treeList1);
}

private void CreateColumns(TreeList tl) {
    // Create three columns
    tl.BeginUpdate();
    TreeListColumn col1 = tl.Columns.Add();
    col1.FieldName = "Customer";
    col1.Caption = "Customer";
    col1.VisibleIndex = 0;
    TreeListColumn col2 = tl.Columns.Add();
    col2.FieldName = "Location";
    col2.Caption = "Location";
    col2.VisibleIndex = 1;
    TreeListColumn col3 = tl.Columns.Add();
    col3.FieldName = "Phone";
    col3.Caption = "Phone";
    col3.VisibleIndex = 2;
    tl.EndUpdate();
}

private void CreateNodes(TreeList tl) {
    tl.BeginUnboundLoad();
    // Create a root node
    TreeListNode parentForRootNodes = null;
    TreeListNode rootNode = tl.AppendNode(
        new object[] { "Alfreds Futterkiste", "Germany, Obere Str. 57", "030-0074321" },
        parentForRootNodes);
    // Create a child of the rootNode
    tl.AppendNode(new object[] { "Suyama, Michael", "Obere Str. 55", "030-0074263" }, rootNode);
    // Create more nodes
    // ...
    tl.EndUnboundLoad();
}

VB.NET

Imports DevExpress.XtraTreeList
Imports DevExpress.XtraTreeList.Columns
Imports DevExpress.XtraTreeList.Nodes

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    CreateColumns(treeList1)
    CreateNodes(treeList1)
End Sub

Private Sub CreateColumns(ByVal tl As TreeList)
    ' Create three columns
    tl.BeginUpdate()
    Dim col1 As TreeListColumn = tl.Columns.Add()
    col1.FieldName = "Customer"
    col1.Caption = "Customer"
    col1.VisibleIndex = 0
    Dim col2 As TreeListColumn = tl.Columns.Add()
    col2.FieldName = "Location"
    col2.Caption = "Location"
    col2.VisibleIndex = 1
    Dim col3 As TreeListColumn = tl.Columns.Add()
    col3.FieldName = "Phone"
    col3.Caption = "Phone"
    col3.VisibleIndex = 2
    tl.EndUpdate()
End Sub

Private Sub CreateNodes(ByVal tl As TreeList)
    tl.BeginUnboundLoad()
    ' Create a root node
    Dim parentForRootNodes As TreeListNode = Nothing
    Dim rootNode As TreeListNode = tl.AppendNode(New Object() { "Alfreds Futterkiste", "Germany, Obere Str. 57", "030-0074321" }, parentForRootNodes)
    ' Create a child of the rootNode
    tl.AppendNode(New Object() { "Suyama, Michael", "Obere Str. 55", "030-0074263" }, rootNode)
    ' Create more nodes
    ' ...
    tl.EndUnboundLoad()
End Sub