Question

I’m having a problem with my RadGrid…Can you show me how can i on my aspx file set the column value of my grid with a navigation property field?

I’m using Entity, and I have the a table SapDocuments with a foreign Key of the field Process to another Table “Staging”,

At this moment my grid comes with its value at null…

<MasterTableView GridLines="None" Width="100%" ViewStateMode="Disabled" CommandItemSettings-ShowExportToCsvButton="True"
                CommandItemSettings-ShowAddNewRecordButton="false" CommandItemDisplay="Top">
                <Columns>
                    <telerik:GridBoundColumn DataField="SequencialNumber" HeaderText="SequencialNumber"
                        UniqueName="SequencialNumber" SortExpression="SequencialNumber">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="Priority" HeaderText="Priority" UniqueName="Priority"
                        FilterControlAltText="Filter Priority column" SortExpression="Priority" DataType="System.Int32">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="Process" HeaderText="Staging" UniqueName="Process"
                        SortExpression="Process" FilterControlAltText="Filter Process column">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="SupplierCode" HeaderText="SupplierCode" UniqueName="SupplierCode"
                        SortExpression="SupplierCode" FilterControlAltText="Filter SupplierCode column">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="MessageStatus" HeaderText="MessageStatus" UniqueName="MessageStatus"
                        SortExpression="MessageStatus" FilterControlAltText="Filter MessageStatus column">
                    </telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="DocumentType" HeaderText="DocumentType" UniqueName="DocumentType"
                        FilterControlAltText="Filter DocumentType column" SortExpression="DocumentType">
                    </telerik:GridBoundColumn>
                    <telerik:GridDateTimeColumn UniqueName="InvoiceCreationDate" DataField="InvoiceCreationDate"
                        HeaderText="InvoiceCreationDate" FilterControlAltText="Filter InvoiceCreationDate column"
                        SortExpression="InvoiceCreationDate">
                        <FilterTemplate>
                            <telerik:RadDatePicker ID="RadDatePicker1" runat="server">
                            </telerik:RadDatePicker>
                        </FilterTemplate>
                    </telerik:GridDateTimeColumn>
                    <telerik:GridBoundColumn DataField="SupplierVatNumber" FilterControlAltText="Filter SupplierVatNumber column"
                        HeaderText="SupplierVatNumber" SortExpression="SupplierVatNumber" UniqueName="SupplierVatNumber">
                    </telerik:GridBoundColumn>
                </Columns>
                <ExpandCollapseColumn Visible="False">
                    <HeaderStyle Width="19px"></HeaderStyle>
                </ExpandCollapseColumn>
                <RowIndicatorColumn Visible="False">
                    <HeaderStyle Width="20px" />
                </RowIndicatorColumn>
            </MasterTableView>
            <FilterMenu EnableImageSprites="False">
            </FilterMenu>
            <HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Default">
            </HeaderContextMenu>
        </telerik:RadGrid

>

I need to set those two column values with the value of my navigation property….I can access to it like that:

• SapDocuments.Staging.Process;

• SapDocuments.Priorities.Priority;

  public List<SapDocuments> GetSapDocumentsByUser(string userName)
  {
      using (EscalonamentoFacturasEntities spDocs = new EscalonamentoFacturasEntities())
      {
  
          //Não é permitido projecções select new...
          var documentsQuery = from sd in spDocs.SapDocuments
                               join ua in spDocs.UsersAssign
                               on new { sd.Staging.Process, sd.Priorities.Priority }
                               equals
                               new { ua.Process, ua.Priority }
                               where ua.UserName == userName
  
                               //ALterar User
  
                               select sd;
  
  
          return documentsQuery.ToList();
  

My code behind is this:

 private void LoadData()
    {
        //Popular dados na Radlist

        SapDocumentsBO sapDocs = new SapDocumentsBO();
        this.SapDocuments = sapDocs.GetSapDocumentsByUser(Page.User.Identity.Name.Substring(Page.User.Identity.Name.IndexOf("\\")+1));

        RadGrid1.DataSource = this.SapDocuments;


    }

    protected void RadGrid1_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
    {
        LoadData();
    }

Answer 1

Did you enable lazy loading on the object context? If not, relationships will always be null, and you would have to manually instantiate them using the Load() method on the associated reference. More on that here: http://msdn.microsoft.com/en-us/library/dd456846.aspx

EDIT: Also, you could consider

var documentsQuery = from sd in spDocs.SapDocuments
                             join ua in spDocs.UsersAssign
                             on new { sd.Staging.Process, sd.Priorities.Priority }
                             equals
                             new { ua.Process, ua.Priority }
                             where ua.UserName == userName
                             select new
                             {
                                 spDocs.SequentialNumber,
                                 Process = (spDocs.Staging != null) ? spDocs.Staging.Process : "",
                                 Priority = (spDocs.Priorities != null) ? spDocs.Priorites.Priority : ""
                             };

And return the result as IQueryable or IList. That would make it really easy to bind.

Also, the RadGrid does support dot notation i believe like the following:

<telerik:GridBoundColumn DataField="Priorities.Priority" HeaderText="Priority" ...