Columns Of Two Related Database Tables In One GridView With EntityDataSource
Feb 17, 2010
I have two SQL Server tables with Primary Keys (PK) and a Foreign Key (FK) linking the two tables:
1) Table "Order"
OrderID, int, PK
AddressID, int, FK
...
2) Table "Address"
AddressID, int, PK
City, nvarchar(50)
...
Then I've created an (ADO.NET) Entity Data Model out of those two tables. Now on my (ASP.NET) webpage I put a GridView with an EntityDataSource. In my GridView I want to display two columns:
OrderID City (belonging to that order and linked by the AddressID-key) How can I do that? My problem is: When I configure the Entity Data Source I can select an "EntitySetName" which can be either "Order" or "Address" but not both, nor can I select any kind of relationship. If I select "Order" as EntitySetName
then in the GridView I can add the columns
OrderID
Address
Address.AddressID
Adding the column "Address" displays empty cells. Adding "OrderID" and "Address.AddressID" displays the expected IDs. But how can I add the "City" of the related address to my GridView? Edit: Clarification:
The Entity Framework has created a class "Order" and a class "Address" corresponding to the database tables. The class "Order" has a reference to an "Address" object as a navigation property, corresponding to the 1-n relationship between Address and Order table. Basically I want to have a column in my GridView which displays Order.Address.City. I have tried to add a bound field with "Address.City" as data field to the GridView but it results in a runtime error ("no such property...").
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DataBinding: 'TmModel.tbICObjectBase' does not contain a property with the name 'Group'
the code declaration for error 1:
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Group") %>' />
DataBinding: 'TmModel.tbICObjectBase' does not contain a property with the name 'tbICTagBase'.
the code declaration for error 2:
<asp:Label ID="Label1" runat="server" Text='<%# Bind("tbICTagBase.Group") %>' />
DataBinding: 'System.Data.Objects.DataClasses.EntityCollection`1[[TmModel.tbICTagBase, TmModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' does not contain a property with the name 'Group'.
the code declaration for error 3:
<asp:Label ID="tbICTagBasesLabel" runat="server" Text='<%# Bind("tbICTagBases.Group") %>' />
EntityDataSource
<asp:EntityDataSource ID="entDSObjectBase" runat="server" AutoGenerateWhereClause="True"
ConnectionString="name=IntouchDBContainer" Include="tbICTagBases"
DefaultContainerName="IntouchDBContainer" EnableFlattening="False"
EntitySetName="tbICObjectBases" EnableDelete="True" EnableInsert="True"
EnableUpdate="True" EntityTypeFilter="tbICObjectBase">
<WhereParameters>
<asp:SessionParameter SessionField="Tag" Name="RecID" Type="Int64" />
</WhereParameters>
</asp:EntityDataSource>
You can see the model at [URL] Or [URL]
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My database has a Resellers table which has ResellerID (primary key, int) and Name columns along with other data.
I also have an Orders table which contains OrderID (primary key, int), OrderDate, ResellerID (foreign key to Resellers.ReselerID).
If I just do a query like:
[Code]....
I am able to reference order.Reseller.Name just fine with no problems.
However I have an EntityDataSource on my page as follows:
[Code]....
Notice the Include="Reseller" attribute in the datasource... I also have a GridView tied to that datasource as follows: I cut some of it off for breavity:
[Code]....
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FROM (Students INNER JOIN StudentSubject ON Students.StudentID = StudentSubject.StudentID) WHERE (StudentSubject.Subject = ?) AND (StudentSubject.ReportYear = ?) AND (Students.Grade = ?) AND (StudentSubject.ReportSession = ?)"
UpdateCommand="UPDATE StudentSubject SET GradeOverall = ?, Criteria1Grade = ?, Criteria8Grade = ?, Criteria7Grade = ?, Criteria6Grade = ?, Criteria5Grade = ?, Criteria4Grade = ?, Criteria3Grade = ?, Criteria2Grade = ?, Criteria9Grade = ?,
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</asp:AccessDataSource>
<asp:AccessDataSource ID="DSGrid" runat="server"
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[Code]....
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[Code]....
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};
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}
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