ListEditItemRequestedByValueEventArgs.Value Property

Gets an object that is the requested item’s value.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v19.2.dll

Declaration

C#

public object Value { get; }

VB.NET

Public ReadOnly Property Value As Object

Property Value

Type	Description
Object	A Object that is the item’s value.

Remarks

To get the requested item’s text, use the ListEditItemRequestedByValueEventArgs.Text property.

Example

The following section of the Filtering Large Data Source online demo illustrates how the ASPxComboBox.ItemsRequestedByFilterCondition and ASPxComboBox.ItemRequestedByValue events of the ASPxComboBox editor can be handled to filter the editor’s data source containing a large number of records.

Note

To work properly, both the ItemsRequestedByFilterCondition and ItemRequestedByValue events should be handled.

C#

protected void ASPxComboBox_OnItemsRequestedByFilterCondition_SQL(object source, 
ListEditItemsRequestedByFilterConditionEventArgs e) {
         ASPxComboBox comboBox = (ASPxComboBox)source;
         SqlDataSource1.SelectCommand = @"SELECT OID, [From], Sent, Subject 
             FROM (select OID, [From], Sent, Subject, row_number() over(order by t.Sent) as [rn] 
             from dbo.ServerSideGridTest as t WHERE ((t.Subject LIKE @filter) OR (t.[From] 
              LIKE @filter))) as st where st.[rn] between @startIndex and @endIndex";
         SqlDataSource1.SelectParameters.Clear();
         SqlDataSource1.SelectParameters.Add("filter", TypeCode.String, string.Format("%{0}%", e.Filter));
         SqlDataSource1.SelectParameters.Add("startIndex", TypeCode.Int64, (e.BeginIndex + 1).ToString());
         SqlDataSource1.SelectParameters.Add("endIndex", TypeCode.Int64, (e.EndIndex + 1).ToString());
         comboBox.DataSource = SqlDataSource1;
         comboBox.DataBind();
}

protected void ASPxComboBox_OnItemRequestedByValue_SQL(object source, 
ListEditItemRequestedByValueEventArgs e) {
    ASPxComboBox comboBox = (ASPxComboBox)source;
    SqlDataSource1.SelectCommand = @"SELECT OID, Subject, [From], Sent 
        FROM dbo.ServerSideGridTest WHERE (OID = @OID) ORDER BY Sent";
    SqlDataSource1.SelectParameters.Add("OID", TypeCode.Int64, e.Value.ToString());
    ...
    comboBox.DataSource = SqlDataSource1;
    comboBox.DataBind();
}

ASPX

<dxe:ASPxComboBox ID="ASPxComboBox1" runat="server" 
EnableCallbackMode="true" CallbackPageSize="10" 
    IncrementalFilteringMode="Contains" ValueType="System.String" ValueField="OID" 
    OnItemsRequestedByFilterCondition="ASPxComboBox_OnItemsRequestedByFilterCondition_SQL" 
    OnItemRequestedByValue="ASPxComboBox_OnItemRequestedByValue_SQL"  
    TextFormatString="{0};{1}" TextField="From" Width="100%" DropDownWidth="610">
    <Columns>
        <dxe:ListBoxColumn FieldName="Subject" Width="300px"/>
        <dxe:ListBoxColumn FieldName="From" Width="80px"/>
        <dxe:ListBoxColumn FieldName="Sent"/>
    </Columns>
</dxe:ASPxComboBox>

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the Value property.

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#

gridview-a-simple-implementation-of-cascading-comboboxes-in-batch-edit-mode-t155879/CS/Models/ComboBoxPropertiesProvider.cs#L104

int id;
if (e.Value == null || !int.TryParse(e.Value.ToString(), out id))
    return null;

gridview-how-to-implement-cascaded-combo-boxes-in-the-editform-e4425/CS/Models/ComboBoxPropertiesProvider.cs#L103

int id;
if (e.Value == null || !int.TryParse(e.Value.ToString(), out id))
    return null;

VB.NET

gridview-a-simple-implementation-of-cascading-comboboxes-in-batch-edit-mode-t155879/VB/Models/ComboBoxPropertiesProvider.vb#L96

Dim id As Integer
If e.Value Is Nothing OrElse (Not Integer.TryParse(e.Value.ToString(), id)) Then
    Return Nothing

gridview-how-to-implement-cascaded-combo-boxes-in-the-editform-e4425/VB/Models/ComboBoxPropertiesProvider.vb#L94

Dim id As Integer
If e.Value Is Nothing OrElse (Not Integer.TryParse(e.Value.ToString(), id)) Then
    Return Nothing