RadGrid 设置列导航属性

Question

我的 RadGrid 出现问题...您能告诉我如何在我的 aspx 文件中使用导航属性字段设置网格的列值吗？

我正在使用实体，并且我有一个表 SapDocuments，其中包含字段 Process 的外键到另一个表“Staging”，

此时我的网格的值为 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

>

我需要用我的导航属性的值设置这两个列值....我可以这样访问它：

• 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();
  

我的代码是这样的：

 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

您是否在对象上下文上启用了延迟加载？如果不是，则关系将始终为空，并且您必须使用关联引用上的 Load() 方法手动实例化它们。更多信息在这里：http://msdn.microsoft.com/en-us/library/dd456846.aspx

编辑：另外，你可以考虑

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 : ""
                             };

并将结果作为 IQueryable 或 IList 返回。这将使它非常容易绑定。

此外，RadGrid 确实支持点表示法，我相信如下：

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