Question

我的RadGrid有问题...你能告诉我我的aspx文件怎么能用导航属性字段设置网格的列值？

我正在使用Entity，并且我将一个表SapDocuments与字段Process的外键处理到另一个表“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

＆GT;

我需要使用导航属性的值设置这两个列值....我可以像这样访问它：

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();

我的代码背后是：

 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中启用了延迟加载？如果不是，关系将始终为null，您必须使用关联引用上的Load（）方法手动实例化它们。更多相关内容：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 : ""
                             };

并将结果返回为IQueryable或IList。这将使绑定变得非常容易。

此外，RadGrid确实支持点符号，我相信如下：

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

RadGrid设置列导航属性

1 个答案: