Infragistics2.Win.UltraWinTree.v8.1
AllowDelete Property
See Also  Example
Infragistics.Win.UltraWinTree Namespace > Override Class : AllowDelete Property

Gets/sets a value which determines if a user can delete the node using the 'Delete' key.

Syntax

Visual Basic (Declaration) 
Public Property AllowDelete As DefaultableBoolean
C# 
public DefaultableBoolean AllowDelete {get; set;}

Remarks

When true, if the user pressed the "Delete" key while the UltraTree has focus, the tree will automatically respond. By default, the tree will automatically display a confirmation dialog. If it is accepted, all selected nodes will be deleted. To change or remove this dialog, see the UltraTree.BeforeDelete event.

When false, pressing 'Delete' will have no effect on the node.

Example

The following sample code shows how to allow deletion of nodes.

Visual BasicCopy Code
    Imports Infragistics.Win
    Imports Infragistics.Win.UltraWinTree

    Private Sub button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button1.Click

        ' Note: the Override objects are exposed as properties off
        ' the tree, the node and the nodes collection as well as
        ' items in the NodeLevelOverrides collection. This allows
        ' default settings to be specified for the tree, a node,
        ' a node's children or for a level in the tree.

        ' Set the default to allow deletion of all nodes if the
        ' user selects a node and presses the 'Delete' key
        Me.ultraTree1.Override.AllowDelete = DefaultableBoolean.True

        ' Set the default for nodes that are at level 2
        ' (i.e. grandchild nodes of root modes) so that
        ' they can't be deleted.
        ' This overrides the default setting above.
        Me.ultraTree1.NodeLevelOverrides(2).AllowDelete = DefaultableBoolean.False

        ' Set the default for nodes at the root level
        ' so that they can't be deleted.
        ' This overrides the default settings above.
        Me.ultraTree1.Nodes.Override.AllowDelete = DefaultableBoolean.False

        Dim node As UltraTreeNode

        ' Get a specific node by its key value.
        ' Note: this will return the node that has that key
        ' from anywhere in the tree structure since keys are
        ' unique across the entire tree.
        node = Me.ultraTree1.GetNodeByKey("child node 1")

        ' Disallow deletion of that specific node only.
        ' This overrides any default settings above.
        node.Override.AllowDelete = DefaultableBoolean.False

        ' However, do allow deletion of that node's child nodes
        node.Nodes.Override.AllowDelete = DefaultableBoolean.True

    End Sub
C#Copy Code
       using Infragistics.Win;
       using Infragistics.Win.UltraWinTree;


       private void button1_Click(object sender, System.EventArgs e)
       {

           // Note: the Override objects are exposed as properties off
           // the tree, the node and the nodes collection as well as
           // items in the NodeLevelOverrides collection. This allows
           // default settings to be specified for the tree, a node,
           // a node's children or for a level in the tree.
 
           // Set the default to allow deletion of all nodes if the
           // user selects a node and presses the 'Delete' key
           this.ultraTree1.Override.AllowDelete = DefaultableBoolean.True;
       
           // Set the default for nodes that are at level 2
           // (i.e. grandchild nodes of root modes) so that
           // they can't be deleted.
           // This overrides the default setting above.
           this.ultraTree1.NodeLevelOverrides[2].AllowDelete = DefaultableBoolean.False;

           // Set the default for nodes at the root level
           // so that they can't be deleted.
           // This overrides the default settings above.
           this.ultraTree1.Nodes.Override.AllowDelete = DefaultableBoolean.False;

           // Get a specific node by its key value.
           // Note: this will return the node that has that key
           // from anywhere in the tree structure since keys are
           // unique across the entire tree.
           UltraTreeNode node = this.ultraTree1.GetNodeByKey("child node 1");

           // Disallow deletion of that specific node only.
           // This overrides any default settings above.
           node.Override.AllowDelete = DefaultableBoolean.False;

           // However, do allow deletion of that node's child nodes
           node.Nodes.Override.AllowDelete = DefaultableBoolean.True;

       }

See Also