GridViewBaseRowTemplateContainer.KeyValue Property
Gets an object that uniquely identifies the row that contains the template container.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v19.2.dll
Declaration
public virtual object KeyValue { get; }
Public Overridable ReadOnly Property KeyValue As Object
Property Value
| Type |
Description |
| Object |
An object that uniquely identifies the row that contains the template container.
|
Example
Sometimes it is necessary to show hierarchical data inside a detail ASPxGridView row. ASPxTreeList can show hierarchical data, but it does not have the built-in capability to get a corresponding master row key value.
To get a grid master row key value, it is necessary to move up through a hierarchy of controls to find the GridViewBaseRowTemplateContainer that has the KeyValue property. This is a universal solution and it can be applied to any ASP.NET control held in a grid template.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using DevExpress.Web.ASPxGridView;
using DevExpress.Web.ASPxTreeList;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected object GetMasterRowKeyValue(ASPxTreeList treeList) {
GridViewBaseRowTemplateContainer container = null;
Control control = treeList;
while(control.Parent != null) {
container = control.Parent as GridViewBaseRowTemplateContainer;
if(container != null) break;
control = control.Parent;
}
return container.KeyValue;
}
protected void ASPxTreeList1_Init(object sender, EventArgs e) {
ASPxTreeList treeList = sender as ASPxTreeList;
object keyValue = GetMasterRowKeyValue(treeList);
treeList.RootValue = keyValue;
}
}
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="DevExpress.Web.ASPxGridView.v11.1, Version=11.1.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v11.1, Version=11.1.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dxe" %>
<%@ Register Assembly="DevExpress.Web.ASPxTreeList.v11.1, Version=11.1.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxTreeList" TagPrefix="dx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False" DataSourceID="AccessDataSource1"
KeyFieldName="ID">
<Templates>
<DetailRow>
<dx:ASPxTreeList ID="ASPxTreeList1" runat="server" AutoGenerateColumns="False"
DataSourceID="AccessDataSource1" KeyFieldName="ID" OnInit="ASPxTreeList1_Init"
ParentFieldName="PARENTID">
<Columns>
<dx:TreeListTextColumn FieldName="DEPARTMENT" VisibleIndex="0">
</dx:TreeListTextColumn>
</Columns>
</dx:ASPxTreeList>
</DetailRow>
</Templates>
<Columns>
<dx:GridViewDataTextColumn FieldName="ID" ReadOnly="True" VisibleIndex="0">
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="PARENTID" VisibleIndex="1">
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="DEPARTMENT" VisibleIndex="2">
</dx:GridViewDataTextColumn>
</Columns>
<SettingsDetail ShowDetailRow="True" />
</dx:ASPxGridView>
<asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/App_Data/Departments.mdb"
DeleteCommand="DELETE FROM [Departments] WHERE (([ID] = ?) OR ([ID] IS NULL AND ? IS NULL))"
InsertCommand="INSERT INTO [Departments] ([ID], [PARENTID], [DEPARTMENT]) VALUES (?, ?, ?)"
SelectCommand="SELECT [ID], [PARENTID], [DEPARTMENT] FROM [Departments]" UpdateCommand="UPDATE [Departments] SET [PARENTID] = ?, [DEPARTMENT] = ? WHERE (([ID] = ?) OR ([ID] IS NULL AND ? IS NULL))">
<DeleteParameters>
<asp:Parameter Name="ID" Type="Double" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="PARENTID" Type="Double" />
<asp:Parameter Name="DEPARTMENT" Type="String" />
<asp:Parameter Name="ID" Type="Double" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="ID" Type="Double" />
<asp:Parameter Name="PARENTID" Type="Double" />
<asp:Parameter Name="DEPARTMENT" Type="String" />
</InsertParameters>
</asp:AccessDataSource>
</div>
</form>
</body>
</html>
<%@ Page Language="vb" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<%@ Register Assembly="DevExpress.Web.ASPxGridView.v11.1, Version=11.1.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v11.1, Version=11.1.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dxe" %>
<%@ Register Assembly="DevExpress.Web.ASPxTreeList.v11.1, Version=11.1.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxTreeList" TagPrefix="dx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False" DataSourceID="AccessDataSource1"
KeyFieldName="ID">
<Templates>
<DetailRow>
<dx:ASPxTreeList ID="ASPxTreeList1" runat="server" AutoGenerateColumns="False"
DataSourceID="AccessDataSource1" KeyFieldName="ID" OnInit="ASPxTreeList1_Init"
ParentFieldName="PARENTID">
<Columns>
<dx:TreeListTextColumn FieldName="DEPARTMENT" VisibleIndex="0">
</dx:TreeListTextColumn>
</Columns>
</dx:ASPxTreeList>
</DetailRow>
</Templates>
<Columns>
<dx:GridViewDataTextColumn FieldName="ID" ReadOnly="True" VisibleIndex="0">
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="PARENTID" VisibleIndex="1">
</dx:GridViewDataTextColumn>
<dx:GridViewDataTextColumn FieldName="DEPARTMENT" VisibleIndex="2">
</dx:GridViewDataTextColumn>
</Columns>
<SettingsDetail ShowDetailRow="True" />
</dx:ASPxGridView>
<asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/App_Data/Departments.mdb"
DeleteCommand="DELETE FROM [Departments] WHERE (([ID] = ?) OR ([ID] IS NULL AND ? IS NULL))"
InsertCommand="INSERT INTO [Departments] ([ID], [PARENTID], [DEPARTMENT]) VALUES (?, ?, ?)"
SelectCommand="SELECT [ID], [PARENTID], [DEPARTMENT] FROM [Departments]" UpdateCommand="UPDATE [Departments] SET [PARENTID] = ?, [DEPARTMENT] = ? WHERE (([ID] = ?) OR ([ID] IS NULL AND ? IS NULL))">
<DeleteParameters>
<asp:Parameter Name="ID" Type="Double" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="PARENTID" Type="Double" />
<asp:Parameter Name="DEPARTMENT" Type="String" />
<asp:Parameter Name="ID" Type="Double" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="ID" Type="Double" />
<asp:Parameter Name="PARENTID" Type="Double" />
<asp:Parameter Name="DEPARTMENT" Type="String" />
</InsertParameters>
</asp:AccessDataSource>
</div>
</form>
</body>
</html>
Imports Microsoft.VisualBasic
Imports System
Imports System.Data
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls
Imports DevExpress.Web.ASPxGridView
Imports DevExpress.Web.ASPxTreeList
Partial Public Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
End Sub
Protected Function GetMasterRowKeyValue(ByVal treeList As ASPxTreeList) As Object
Dim container As GridViewBaseRowTemplateContainer = Nothing
Dim control As Control = treeList
Do While control.Parent IsNot Nothing
container = TryCast(control.Parent, GridViewBaseRowTemplateContainer)
If container IsNot Nothing Then
Exit Do
End If
control = control.Parent
Loop
Return container.KeyValue
End Function
Protected Sub ASPxTreeList1_Init(ByVal sender As Object, ByVal e As EventArgs)
Dim treeList As ASPxTreeList = TryCast(sender, ASPxTreeList)
Dim keyValue As Object = GetMasterRowKeyValue(treeList)
treeList.RootValue = keyValue
End Sub
End Class
The following code snippets (auto-collected from DevExpress Examples) contain references to the KeyValue 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.
See Also