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Sam Tran Member
Simple question on binding to complex object
Posted: March 29, 2010 9:58 AM

Glenn,

Thank you for your help.

Your example works fine.

However, there is still something wrong within my class file...it binds perfectly well in all other data controls..but not WebGrid.

I needed to move on so I just re-wrote the query and object so that it would work with Webgrid.

Thanks for your help though!

Simple question on binding to complex object
Posted: March 18, 2010 8:54 AM

Thanks so much for your help Glenn.

Sorry to say that I'm working in VB.Net and while I can get your C# example to work, when I translate the code to VB.Net, it doesn't work.

Both projects have the same references.  Both test pages have the same html/code on the aspx page.

I'm inserting the VB codebehind, which should be an exact translation of your C# example, can you see what would make it not work??

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Data

Partial Public Class _Default
    Inherits System.Web.UI.Page

    Public dt As DataTable

    Private Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
        If dt Is Nothing Then
            dt = New DataTable("Parent")
            dt.Columns.Add("ID")
            dt.Columns.Add("Name")
            dt.Columns.Add("Author")
            dt.Columns.Add("CustomObj", GetType([Object]))
            dt.Rows.Add(New Object() {1, "B1", "A1", New CustomStruct()})
            dt.Rows.Add(New Object() {2, "B2", "A2", New CustomStruct()})
            dt.Rows.Add(New Object() {3, "B3", "A3", New CustomStruct()})
            dt.Rows.Add(New Object() {4, "B4", "A4", New CustomStruct()})
        End If

    End Sub

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        With Me.GridView1
            .DataSource = Me.dt
            .AutoGenerateColumns = False
            .DataBind()
        End With
    End Sub

    Protected Sub TestInitializeDataSource(ByVal sender As Object, ByVal e As ISNet.WebUI.WebGrid.DataSourceEventArgs)
        e.DataSource = Me.dt
    End Sub

End Class

Public Class CustomStruct
    Private _StructID As String
    Public Property StructID() As String
        Get
            Return _StructID
        End Get
        Set(ByVal value As String)
            _StructID = value
        End Set
    End Property

    Private _StructDesc As String
    Public Property StructDesc() As String
        Get
            Return _StructDesc
        End Get
        Set(ByVal value As String)
            _StructDesc = value
        End Set
    End Property
End Class


Simple question on binding to complex object
Posted: March 17, 2010 8:23 AM

Hi Glenn,

Thanks for the response, but I tried that already and got the error:

DataBinding: 'System.DBNull' does not contain a property with the name 'ETID'.

I've also tried brackets around the Eval like this:

<asp:Label ID="Label1" runat="server" Text='<%# Eval("[Sunday.ETID]") %>'></asp:Label>

and get the error:

DataBinding: '[Sunday' is not a valid indexed expression.


I've also tried this:

<ISWebGrid:WebGridColumn Caption="Sun ETID" Name="SunETID" ColumnType="Template" DataMember="Sunday">
<CellTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("ETID") %>'></asp:Label>
</CellTemplate>
</ISWebGrid:WebGridColumn>


Which returns the error:

DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'ETID'.


I'm inserting my test page as a code snippet...it includes a standard Gridview, a telerik RadGrid, and an Intersoft Webgrid...also note that I have a test page with nothing but the Webgrid and it still doesn't work.

The Webgrid is the only control that won't bind to "Sunday.ETID"


Thanks for your help!




    <form id="form1" runat="server">
    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
    </telerik:RadScriptManager>
    <asp:GridView ID="GridView1" runat="server">
        <Columns>
            <asp:BoundField DataField="Client" HeaderText="Client" ReadOnly="True" SortExpression="Client" />
            <asp:BoundField DataField="JobDesc" HeaderText="Job" SortExpression="Job" />
            <asp:TemplateField HeaderText="Sun ETID">
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Eval("Sunday.ETID") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <br />
    <telerik:RadGrid ID="RadGrid1" runat="server" GridLines="None">
        <mastertableview>
        <RowIndicatorColumn>
        <HeaderStyle Width="20px"></HeaderStyle>
        </RowIndicatorColumn>
        <ExpandCollapseColumn>
        <HeaderStyle Width="20px"></HeaderStyle>
        </ExpandCollapseColumn>
            <Columns>
                <telerik:GridBoundColumn UniqueName="column1" DataField="Client" HeaderText="Client">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn UniqueName="column2" DataField="JobDesc" HeaderText="Job">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn UniqueName="column3" DataField="Sunday.ETID" HeaderText="Sun ETID">
                </telerik:GridBoundColumn>
            </Columns>
        </mastertableview>
    </telerik:RadGrid>
    <br />
    <ISWebGrid:WebGrid ID="WebGrid1" runat="server" UseDefaultStyle="True" Height="600px"
        DefaultStyleMode="Elegant" Width="90%">
        <LayoutSettings AllowAddNew="Yes" AllowColumnFreezing="Yes" AllowColumnMove="No"
            AllowDelete="Yes" AllowEdit="Yes" AllowExport="Yes" AllowFilter="No" AllowGrouping="No"
            AllowMultipleSelection="Yes" AllowSelectColumns="Yes" AllowSorting="Yes" AutoFitColumns="True"
            ShowRefreshButton="true" AutoWidth="True" ColumnFooters="No" GroupByBoxVisible="False"
            AllowContextMenu="False">
        </LayoutSettings>
        <RootTable>
            <Columns>
                <ISWebGrid:WebGridColumn Name="WebGridColumn0" Width="100px" DataMember="Client">
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Name="WebGridColumn1" Width="100px" DataMember="JobDesc">
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Name="WebGridColumn2" Width="100px" DataMember="Sunday"
                    ColumnType="Template">
                    <CellTemplate>
                        <asp:Label ID="Label1" runat="server" Text='Hello'></asp:Label>
                    </CellTemplate>
                </ISWebGrid:WebGridColumn>
                <ISWebGrid:WebGridColumn Caption="Sun ETID" Name="SunETID" ColumnType="Template" DataMember="Sunday">
                    <CellTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Eval("ETID") %>'></asp:Label>
                    </CellTemplate>
                </ISWebGrid:WebGridColumn>
            </Columns>
        </RootTable>
    </ISWebGrid:WebGrid>
    </form>



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