TreeListColumnDisplayTextEventArgs Class

Provides data for the ASPxTreeList.CustomColumnDisplayText event.

Namespace: DevExpress.Web.ASPxTreeList

Assembly: DevExpress.Web.ASPxTreeList.v23.1.dll

NuGet Package: DevExpress.Web

Declaration

C#

public class TreeListColumnDisplayTextEventArgs :
    EventArgs

VB.NET

Public Class TreeListColumnDisplayTextEventArgs
    Inherits EventArgs

Related API Members

TreeListColumnDisplayTextEventArgs is the data class for the following events:

• ASPxTreeList.CustomColumnDisplayText

Example

The following example illustrates the use of the TreeListSettingsBehavior.SortMode property.

In this example, according to the specified sorting mode (the “Sort by Display Text” check box), TreeList’s column data is hierarchically sorted. It means that TreeList’s nodes and their subnodes are sorted separately. For demonstration purposes, each node level is colored with an appropriate color.

C#

protected void Page_Load(object sender, EventArgs e)
{
    TreeList.SettingsBehavior.SortMode = cbSortByDisplayText.Checked ? ColumnSortMode.DisplayText : ColumnSortMode.Value;
    TreeList.DataSource = GetItems();
    TreeList.DataBind();
}

public List<NodeItem> GetItems()
{
    return new List<NodeItem>() {
        new NodeItem(1, 0, 2),
            new NodeItem(2, 1, 3),
            new NodeItem(3, 1, 1),
            new NodeItem(4, 1, 4),
            new NodeItem(5, 1, 2),
            new NodeItem(6, 1, 3),
                new NodeItem(7, 3, 3),
                new NodeItem(8, 3, 6),
                new NodeItem(9, 3, 5),
        new NodeItem(10, 0, 4),
        new NodeItem(11, 0, 3)
    };
}
public class NodeItem
{
    public NodeItem(int id, int parentID, int categoryID) {
        ID = id;
        ParentID = parentID;
        CategoryID = categoryID;
    }
    public int ID { get; set; }
    public int ParentID { get; set; }
    public int CategoryID { get; set; }
}

Dictionary<int, Color> colors = new Dictionary<int, Color>() {
    { 0, Color.LightCoral },
    { 1, Color.LightCyan },
    { 3, Color.LightGreen },
};

protected void TreeList_HtmlRowPrepared(object sender, DevExpress.Web.ASPxTreeList.TreeListHtmlRowEventArgs e)
{
    e.Row.BackColor = colors[Convert.ToInt32(e.GetValue(TreeList.ParentFieldName))];
}
protected void TreeList_CustomColumnDisplayText(object sender, DevExpress.Web.ASPxTreeList.TreeListColumnDisplayTextEventArgs e)
{
    if (e.Column.FieldName == "ID")
        e.DisplayText = Convert.ToInt32(e.Value) % 2 == 0 ? "DisplayText=Text1;   value=" + e.Value : "DisplayText=Text2;   value=" + e.Value;        
}

ASPX

<dx:ASPxCheckBox runat="server" ID="cbSortByDisplayText" AutoPostBack="true" Text="Sort by Display text" />
<dx:ASPxTreeList runat="server" ID="TreeList" KeyFieldName="ID" ParentFieldName="ParentID" Width="500" OnCustomColumnDisplayText="TreeList_CustomColumnDisplayText" OnHtmlRowPrepared="TreeList_HtmlRowPrepared">
    <Columns>
        <dx:TreeListDataColumn FieldName="ID" />
        <dx:TreeListComboBoxColumn FieldName="CategoryID">
        </dx:TreeListComboBoxColumn>
    </Columns>
    <SettingsBehavior AutoExpandAllNodes="true" />
</dx:ASPxTreeList>

Inheritance

Object

EventArgs

TreeListColumnDisplayTextEventArgs