You're welcome Ole M,
Have a good day!
Steven Cheng
Microsoft Online Support
Get Secure!
www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
--------------------
| From: "Ole M" <
[email protected]>
| References: <#
[email protected]>
<
[email protected]>
<
[email protected]>
<
[email protected]>
| Subject: Re: ObjectDataSource in ASP.NET 2.0
| Date: Wed, 2 Nov 2005 11:51:05 +0100
| Lines: 339
| X-Priority: 3
| X-MSMail-Priority: Normal
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| Xref: TK2MSFTNGXA01.phx.gbl
microsoft.public.dotnet.framework.aspnet:135459
| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
|
| Hi,
|
| Ah, great. I wasnt aware of the DataKeyNames property.
|
| Thanks alot for the help!
|
| "Steven Cheng[MSFT]" <
[email protected]> skrev i melding
| | > Hi Ole M,
| >
| > Thanks for your response. However, as for the further problem you
| > mentioned, I think we can still let the ID property being passed from
| > GridView's field to the DataSource for updating. The GridView can let us
| > specify "DataKeyNames" so as to indicate which field is the key column.
| > Also, for the fields, we can set the field's "readonly" and "Visible"
| > property so as to make the primary key field readonly or invisible. So
| > event we define the following gridView template schema:
| >
| > ==========
| > <asp:GridView ID="GridView1" runat="server"
| > DataSourceID="ObjectDataSource1"
| > AutoGenerateColumns="False" DataKeyNames="ID"
| > OnRowUpdating="GridView1_RowUpdating">
| > <Columns>
| > <asp:CommandField ShowEditButton="True" />
| > <asp:BoundField DataField="ID" HeaderText="ID"
| > ReadOnly="true" Visible="false" />
| > <asp:BoundField DataField="Name"
| > .................
| >
| > ==========================
| >
| > The "ID" field is set to invisible, the value will still be passed to
the
| > update event of the GridView or DataSource control. We can check it in
the
| > GridView's RowUpdating event like below:
| >
| > ======================
| > protected void GridView1_RowUpdating(object sender,
| > GridViewUpdateEventArgs
| > e)
| > {
| > foreach (string key in e.Keys.Keys)
| > {
| > Response.Write("<br>key: " + e.Keys[key]);
| > }
| >
| > foreach (string key in e.OldValues.Keys)
| > {
| > Response.Write("<br>Oldvalue: " + e.OldValues[key]);
| > }
| >
| > foreach (string key in e.NewValues.Keys)
| > {
| > Response.Write("<br>Newvalue: " + e.NewValues[key]);
| > }
| >
| > }
| > =======================
| >
| > Thanks,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure!
www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| >
| > --------------------
| > | From: "Ole M" <
[email protected]>
| > | References: <#
[email protected]>
| > <
[email protected]>
| > | Subject: Re: ObjectDataSource in ASP.NET 2.0
| > | Date: Tue, 1 Nov 2005 14:53:16 +0100
| > | Lines: 229
| > | X-Priority: 3
| > | X-MSMail-Priority: Normal
| > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2180
| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180
| > | X-RFC2646: Format=Flowed; Original
| > | Message-ID: <
[email protected]>
| > | Newsgroups: microsoft.public.dotnet.framework.aspnet
| > | NNTP-Posting-Host: fw.home.norlinux.com 213.187.183.210
| > | Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP12.phx.gbl
| > | Xref: TK2MSFTNGXA01.phx.gbl
| > microsoft.public.dotnet.framework.aspnet:135220
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > |
| > | Hi,
| > |
| > | I see your point, but there is still a problem with the solution you
| > have
| > | there. The object passed to the Update(or in your case,
UpdateEmployee)
| > | method only contains values of the fields in the form. So, if the
field
| > "Id"
| > | is not editable by the user, the value of "Id" is always 0.
| > |
| > | "Steven Cheng[MSFT]" <
[email protected]> skrev i melding
| > | | > | > Hi Ole M,
| > | >
| > | > Welcome to ASPNET newsgroup.
| > | >
| > | > Regarding on the ObjectDataSource's update method's question, I
think
| > it's
| > | > the normal behavior which is expected.
| > | > For datasourcecontrol and databindig control, after the object data
| > source
| > | > pass the data bojects to data controls, it no longer hold the actual
| > | > refernce of the oringial data(nor does the data binding control),
also
| > | > since the actual backend datasource may vary (maybe database or xml
| > file
| > | > or
| > | > ...), it don't quite makesense to maintain such a in-memory
reference.
| > In
| > | > fact, this also somewhat related to the ASP.NET application's
runtime
| > | > model, it's request/response based, generally after page output
| > response
| > | > to
| > | > client, all the serverside objects will be disposed and in-memory
| > | > reference
| > | > will no longer make sense in the next page lifecycle. This is
| > diferent
| > | > from winform application. So in such scenario, we should update the
| > | > original object through its primary key value or retrieve the
| > reference
| > | > again from orginal datasource, e.g:
| > | >
| > | >
| > | > ======================
| > | >
| > | > private static List<Employee> _list;
| > | > ......
| > | >
| > | > public static void UpdateEmployee(Employee emp)
| > | > {
| > | > EmployeePredicate ep = new EmployeePredicate(emp.ID);
| > | >
| > | > Employee employee = _list.Find(ep.Assert);
| > | >
| > | > if (employee == null)
| > | > {
| > | > throw new Exception("Invalid Employee info in
| > | > UpdateEmployee()...");
| > | > }
| > | >
| > | > employee.Name = emp.Name;
| > | > employee.Email = emp.Email;
| > | > }
| > | >
| > | > public class EmployeePredicate
| > | > {
| > | > private long _id;
| > | >
| > | > public EmployeePredicate(long id)
| > | > {
| > | > _id = id;
| > | > }
| > | >
| > | > public bool Assert(Employee emp)
| > | > {
| > | > if (emp.ID == _id)
| > | > {
| > | > return true;
| > | > }
| > | > else
| > | > {
| > | > return false;
| > | > }
| > | > }
| > | >
| > | > }
| > | >
| > | > ============================
| > | >
| > | > Thanks,
| > | >
| > | > Steven Cheng
| > | > Microsoft Online Support
| > | >
| > | > Get Secure!
www.microsoft.com/security
| > | > (This posting is provided "AS IS", with no warranties, and confers
no
| > | > rights.)
| > | >
| > | >
| > | >
| > | >
| > | > --------------------
| > | > | From: "Ole M" <
[email protected]>
| > | > | Subject: ObjectDataSource in ASP.NET 2.0
| > | > | Date: Mon, 31 Oct 2005 22:03:59 +0100
| > | > | Lines: 113
| > | > | X-Priority: 3
| > | > | X-MSMail-Priority: Normal
| > | > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2180
| > | > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180
| > | > | X-RFC2646: Format=Flowed; Original
| > | > | Message-ID: <#
[email protected]>
| > | > | Newsgroups: microsoft.public.dotnet.framework.aspnet
| > | > | NNTP-Posting-Host: fw.home.norlinux.com 213.187.183.210
| > | > | Path:
| > TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP10.phx.gbl
| > | > | Xref: TK2MSFTNGXA01.phx.gbl
| > | > microsoft.public.dotnet.framework.aspnet:135092
| > | > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > | > |
| > | > | I'm having some trouble using the ObjectDataSource in ASP.NET 2.0.
| > | > |
| > | > | I have a wrapper that contains the static methods for Select and
| > Update.
| > | > The
| > | > | Update-method takes the business object as parameter.
| > | > |
| > | > | When the Update-method is invoked by the ObjectDataSource, the
| > object
| > | > | referenced is not the same object returned by the Select-method,
but
| > a
| > | > new
| > | > | object with only the values from the Edit-template. So basically I
| > get a
| > | > | reference to a useless object here because it cannot be used by
the
| > DAL.
| > | > |
| > | > | Is this a bug or a feature?
| > | > |
| > | > | Here is some code to illustrate:
| > | > |
| > | > | <asp:GridView ID="GridView1" runat="server"
| > AutoGenerateColumns="False"
| > | > | DataSourceID="ObjectDataSource1">
| > | > |
| > | > | <Columns>
| > | > |
| > | > | <asp:CommandField ShowEditButton="True" />
| > | > |
| > | > | <asp:BoundField DataField="Name" HeaderText="Name"
| > SortExpression="Name"
| > | > />
| > | > |
| > | > | </Columns>
| > | > |
| > | > | </asp:GridView>
| > | > |
| > | > | <asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
| > | > | DataObjectTypeName="Customer"
| > | > |
| > | > | SelectMethod="GetCustomers" TypeName="MyWrapperObj"
| > | > | UpdateMethod="Save"></asp:ObjectDataSource>
| > | > |
| > | > | And the C#-code:
| > | > |
| > | > | public class Customer
| > | > |
| > | > | {
| > | > |
| > | > | private int id;
| > | > |
| > | > | public int Id
| > | > |
| > | > | {
| > | > |
| > | > | get { return id; }
| > | > |
| > | > | set { id = value; }
| > | > |
| > | > | }
| > | > |
| > | > | private string name;
| > | > |
| > | > | public string Name
| > | > |
| > | > | {
| > | > |
| > | > | get { return name; }
| > | > |
| > | > | set { name = value; }
| > | > |
| > | > | }
| > | > |
| > | > | public void Save()
| > | > |
| > | > | {
| > | > |
| > | > | // Do some things here...
| > | > |
| > | > | }
| > | > |
| > | > | }
| > | > |
| > | > | public class MyWrapperObj
| > | > |
| > | > | {
| > | > |
| > | > | public static IList<Customer> GetCustomers()
| > | > |
| > | > | {
| > | > |
| > | > | List<Customer> customers = new List<Customer>();
| > | > |
| > | > | for (int i = 0; i < 10; i++)
| > | > |
| > | > | {
| > | > |
| > | > | Customer customer = new Customer();
| > | > |
| > | > | customer.Id = i;
| > | > |
| > | > | customer.Name = string.Format("Name {0}", i);
| > | > |
| > | > |
| > | > | customers.Add(customer);
| > | > |
| > | > | }
| > | > |
| > | > | return customers;
| > | > |
| > | > | }
| > | > |
| > | > | public static void Save(Customer obj)
| > | > |
| > | > | {
| > | > |
| > | > | obj.Save(); // This object is NOT in the IList returned by
| > | > GetCustomers()
| > | > |
| > | > | }
| > | > |
| > | > | }
| > | > |
| > | > |
| > | > |
| > | >
| > |
| > |
| > |
| >
|
|
|
