使用EntityDataSource在GridView上显示导航属性？
我有一个EntityDataSource我已映射到实体Resident，它包含两个导航属性（Building1，Room1）。我已将GridView设置为使用此EntityDataSource并将EntityDataSource Include属性设置为Building1，Room1，因此它包含这些导航属性并将这些列添加到GridView。当我运行应用程序而不是显示相关的导航属性时，它显示：webHousingAdmin.Building
如何让它显示实际值？
对于GridView，代码如下所示：
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl1" runat="server" Text='<%# Bind("Building1") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Building">
<ItemTemplate>
<asp:Label ID="lblBuilding" Text='<%# Bind("Building1.building_name") %>' runat="server" />
</ItemTemplate>
</asp:TemplateField>
没有找到相关结果
已邀请:
2 个回复
际恃啸称桅
类的标量属性绑定到...<asp:Label ID="lbl1" runat="server" Text='<%# Bind("Building1.Name") %>' />......public class Building { public string Name { get; set; } public string AnotherText { get; set; } public override string ToString() { return string.Concat(Name, ", ", AnotherText); // or whatever you like } }- 如果不覆盖，则仅返回完整的类名（命名空间点类名）。这就解释了为什么你只在你的例子中看到。 编辑 与此问题并不真正相关：但是如果您尝试将导航属性与（而不仅仅是）绑定以用于数据源和网格之间的双向通信，则可能会遇到问题。可能它不会起作用。看到这个相关的问题和答案： 一个带有EntityDataSource的ASP.NET GridView中的两个相关数据库表的列弦砂牧扁
<asp:EntityDataSource ID="dsResidents" runat="server" ConnectionString="name=connString" DefaultContainerName="dbContext" EntitySetName="Residents" Include="Building" EnableUpdate="true" /> <asp:GridView ID="ResidentGrid" runat="server" DataSourceID="dsResidents" OnRowUpdating="ResidentsGrid_RowUpdating" AutoGenerateColumns="False"> <Columns> <asp:CommandField ShowEditButton="True" /> <asp:TemplateField Visible="false"> <ItemTemplate> <asp:Label ID="lblID" Text='<%# Eval("residentId") %>' runat="server" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Name"> <ItemTemplate> <asp:Label ID="lblName" Text='<%# Eval("residentName") %>' runat="server" /> </ItemTemplate> <asp:TemplateField HeaderText="CountryCode"> <ItemTemplate> <asp:Label ID="lblCountryCode" Text='<%# Eval("Building.number") %>' runat="server" /> </ItemTemplate> <EditItemTemplate> <asp:EntityDataSource ID="dsBuildings" runat="server" ConnectionString="name=connString" DefaultContainerName="dbContext" EntitySetName="Buildings" /> <asp:DropDownList ID="ddlBuilding" DataSourceID="dsBuildings" DataTextField="number" DataValueField="id" SelectedValue='<%# Eval("id") %>' <!-- I am not sure about this line --> runat="server" /> </EditItemTemplate> </asp:TemplateField> </Columns> </asp:GridView>protected void ResidentsGrid_RowUpdating(object sender, GridViewUpdateEventArgs e) { // This is for retrieving the entity object for the resident selected Label idLabel = (Label)ResidentsGrid.Rows[e.RowIndex].Cells[1].FindControl("lblID"); int residentId = int.Parse(idLabel.Text); // And this is for the building selected in the dropdown DropDownList ddl = (DropDownList)ResidentsGrid.Rows[e.RowIndex].Cells[4].FindControl("ddlBuilding"); // I would like to say that the cell index is the column position but as I know it isn't using (dbContext ctx = new dbContext()) { Resident resident = ctx.Residents .Where(res => res.residentId == residentId).First(); Building selectedBuilding = ctx.Buildings .Where(bld => bld.id == ddl.SelectedItem.Value).First(); resident.Building = selectedBuilding; ctx.SaveChanges(); } }