TreeListNode.GetValue(String) Method

Returns the value of the specified cell within the current node.

Namespace: DevExpress.Web.ASPxTreeList

Assembly: DevExpress.Web.ASPxTreeList.v19.2.dll

Declaration

C#

public virtual object GetValue(
    string fieldName
)

VB.NET

Public Overridable Function GetValue(
    fieldName As String
) As Object

Parameters

Name	Type	Description
fieldName	String	A String value that specifies the name of the data source field.

Returns

Type	Description
Object	An object that represents the specified cell’s value.

Remarks

To specify node values, use the TreeListNode.SetValue method.

Example

Assume that ASPxTreeList is bound to an “Order Details” data table (NWind data base), which contains “UnitPrice”, “Quantity” and “Discount” fields. There is no field that represents the total sum, as this can be calculated manually as follows: UnitPrice*Quantity*(1-Discount). This example shows how to add an unbound column to the ASPxTreList control to represent the total sum of an order.

The image below shows the result.

C#

protected void TreeList_CustomUnboundColumnData(object sender, TreeListCustomUnboundColumnDataEventArgs e)
{
    if (e.Column.FieldName == "Total")
    {
        decimal unitPrice = Convert.ToDecimal(e.Node.GetValue("UnitPrice"));
        decimal quantity = Convert.ToDecimal(e.Node.GetValue("Quantity"));
        decimal discount = Convert.ToDecimal(e.Node.GetValue("Discount"));
        e.Value = unitPrice * quantity * (1 - discount);
    }
} 

ASPX

<dx:ASPxTreeList runat="server" ID="TreeList" Width="400px" OnCustomUnboundColumnData="TreeList_CustomUnboundColumnData" DataSourceID="SqlDataSource1" 
    SettingsPager-Mode="ShowPager" AutoGenerateColumns="False" KeyFieldName="OrderID">
    <Columns>
        <dx:TreeListTextColumn FieldName="ProductID" VisibleIndex="0" ReadOnly="True">
        </dx:TreeListTextColumn>
        <dx:TreeListTextColumn FieldName="UnitPrice" VisibleIndex="1">
        </dx:TreeListTextColumn>
        <dx:TreeListTextColumn FieldName="Quantity" VisibleIndex="2">
        </dx:TreeListTextColumn>
        <dx:TreeListTextColumn FieldName="Discount" VisibleIndex="3">
        </dx:TreeListTextColumn>
        <dx:TreeListDataColumn FieldName="Total" UnboundType="Decimal"/>
    </Columns>
    <SettingsPager Mode="ShowPager">
    </SettingsPager>
</dx:ASPxTreeList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\nwind.mdb; Persist Security Info=True" 
ProviderName="System.Data.OleDb" SelectCommand="SELECT [ProductID], [UnitPrice], [Quantity], [Discount] FROM [Order Details]"></asp:SqlDataSource>      

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the GetValue(String) method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

multi-node-editing-via-a-datacell-template-e1314/CS/WebSite/Default.aspx.cs#L43

ASPxTextBox tb = (ASPxTextBox)tree.FindDataCellTemplateControl(node.Key, dc, "editor");
if (!tb.Text.Equals(node.GetValue(dc.FieldName)))
    isModified = true;

treelist-how-to-create-an-external-search-field-with-textbox-and-highlight-the-search-text-t532684/CS/SearchHighlight/Models/TreeListHighlightHelper.cs#L31

public static void CheckNode(TreeListNode node, string searchText) {
    object node_value = node.GetValue("FirstName");
    if (node_value == null)

VB.NET

multi-node-editing-via-a-datacell-template-e1314/VB/WebSite/Default.aspx.vb#L38

Dim tb As ASPxTextBox = CType(tree.FindDataCellTemplateControl(node.Key, dc, "editor"), ASPxTextBox)
If (Not tb.Text.Equals(node.GetValue(dc.FieldName))) Then
    isModified = True

treelist-how-to-create-an-external-search-field-with-textbox-and-highlight-the-search-text-t532684/VB/SearchHighlight/Models/TreeListHighlightHelper.vb#L32

Public Shared Sub CheckNode(ByVal node As TreeListNode, ByVal searchText As String)
    Dim node_value As Object = node.GetValue("FirstName")
    If node_value Is Nothing Then