Entity Framework Tables Primary Key

Question

This are my tables

Message

Person

This is my Gridview source

<asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" 
                    CommandName="Select" Text="Select"></asp:LinkButton>
                <asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" 
                    CommandName="Delete" Text="Delete"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="RecipientID" SortExpression="Person.LastName">
            <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text='<%# Bind("Person.LastName") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="Subject" HeaderText="Subject" 
            SortExpression="Subject" />
        <asp:BoundField DataField="Message1" HeaderText="Message" 
            SortExpression="Message1" />
        <asp:BoundField DataField="Status" HeaderText="Status" 
            SortExpression="Status" />
        <asp:BoundField DataField="Date" HeaderText="Date" SortExpression="Date" />
        <asp:TemplateField HeaderText="SenderID" SortExpression="Person.LastName">
            <ItemTemplate>
                <asp:Label ID="Label2" runat="server" Text='<%# Bind("Person.LastName") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>

This is the result

Can you guys help me to display the Sender's name ? :) Thank you guys in advance! I'm using Entity Datasource

UPDATE

I'm logging in as User Carlo

Sender display the user that's logged in not the true sender in the Message Table

this is my Entity Model

Answer 1

You've already got the navigation properties you need for this, but their names conceal their role. You use Message.Person to get the sender's name, likewise you can user Message.Person1 to get the recipient's name.

I would rename the properties Person and Person1 into Sender and Recipient , respectively. Thus, they match the primitive foreign key names SenderID and RecipientID . Likewise, you could rename the Person.Messages properties into MessagesSent and MessagesReceived .

In the template you can use Sender.LastName and Recipient.LastName .

Answer 2

使用此查询

select m.MessageID,m.ReceipientID,m.Subject,m.senderID,p.UserName,p.FirseName from Message m inner join Person p on m.SenderID= p.ID