Question

Gridview not passing new parameters value to ObjectDataSource Update Method

Asked by: noobe1

Hi Experts,
I have a gridview that's bound to a objectdatasource.

In edit mode, when I click "Update" link on the gridview, the new values that I entered isn't updated on the gridview.  There's no error either. The gridview just refreshes and returned to normal mode.

Thanks

<body>
    <form id="form1" runat="server">
    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="GetDictionaries" 
        TypeName="AdminManager" UpdateMethod="UpdateDictionary">
        <UpdateParameters>
            <asp:Parameter Name="ID" Type="String" />
            <asp:Parameter Name="DictionaryName" Type="String" />
            <asp:Parameter Name="Author" Type="String" />
        </UpdateParameters>
    </asp:ObjectDataSource>
    <table style="width:100%;">
        <tr>
            <td>
                &nbsp;</td>
            <td>
    <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" 
        DataSourceID="ObjectDataSource1" DataKeyNames="ID,DictionaryName,Author">
        <Columns>
            <asp:CommandField ShowEditButton="True" />
            <asp:BoundField DataField="ID" HeaderText="ID" Visible="False" />
            <asp:BoundField DataField="DictionaryName" HeaderText="DictionaryName" />
            <asp:BoundField DataField="Author" HeaderText="Author" />
            <asp:BoundField DataField="DateAdded" HeaderText="DateAdded" ReadOnly="True" />
            <asp:BoundField DataField="DateUpdated" HeaderText="DateUpdated" 
                ReadOnly="True" />
        </Columns>
    </asp:GridView>
            </td>
            <td>
                &nbsp;</td>
        </tr>
    </table>
    </form>
</body>
 
    Public Shared Function UpdateDictionary(ByVal ID As String, ByVal DictionaryName As String, ByVal Author As String) As Integer
        Dim connection As SqlConnection = StartConnection()
        Dim sSqlQuery As String = "UPDATE dxDictionaries SET DictionaryName = @DictionaryName, Author = @Author, DateUpdated = @DateUpdated WHERE ID = @ID"
        Dim command As SqlCommand = New SqlCommand(sSqlQuery, connection)
        command.Parameters.AddWithValue("@DictionaryName", DictionaryName)
        command.Parameters.AddWithValue("@Author", Author)
        command.Parameters.AddWithValue("@DateUpdated", DateTime.Now)
        command.Parameters.AddWithValue("@ID", ID)
 
        command.ExecuteNonQuery()
        connection.Close()
 
    End Function

                                  
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Asked On
2009-03-09 at 11:31:15ID24213399
Tags

ASP.NET

Topic

Programming for ASP.NET

Participating Experts
1
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Comments
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Answers

 

by: davrob60Posted on 2009-03-09 at 12:58:16ID: 23840119

if you put a breakpoint in the UpdateDictionary function, did you see :

  1. If the function is lunched  
  2. if the parameter has the expected values. 

 

by: noobe1Posted on 2009-03-09 at 17:57:21ID: 23842732

1. The function is launched.
2. The parameter doesn't have the expected values. The original values, instead of the new values is passed to the function.

 

by: davrob60Posted on 2009-03-09 at 18:09:41ID: 23842784


2 thing to try :
1 add this property to the objectdatasource
OldValuesParameterFormatString="old_"  

the name of the old values paremeters should nob be old_ID,  old_DictionaryName ect...

2 remove the datakey names, i think it may mark those field as read-only.

 

by: noobe1Posted on 2009-03-09 at 18:47:49ID: 23842938

Did what you suggested but it didn't solve the problem.

I tried adding the new values to the objectdatasource at the gridview RowUpdated event. That worked but the strange thing is that the UpdateDictionary function is called twice. The first time with the old values, the second with the new values. 

    Protected Sub GridView2_RowUpdated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdatedEventArgs) Handles GridView2.RowUpdated
        ObjectDataSource1.UpdateParameters("ID").DefaultValue = e.Keys("ID").ToString
        ObjectDataSource1.UpdateParameters("DictionaryName").DefaultValue = e.NewValues.Item("DictionaryName").ToString
        ObjectDataSource1.UpdateParameters("Author").DefaultValue = e.NewValues.Item("Author").ToString
        ObjectDataSource1.Update()
    End Sub

                                              
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by: davrob60Posted on 2009-03-09 at 18:57:21ID: 23842968

RowUpdated occurs AFTER the data is updated, to do it before, use "RowUpdating"

 

by: noobe1Posted on 2009-03-09 at 19:23:44ID: 23843096

Using RowUpdating doesn't work. The function is also called twice. The first time with the NEW values, the second with the OLD values.

 

by: davrob60Posted on 2009-03-10 at 06:05:18ID: 23846102

it<s that call to "ObjectDataSource1.Update()" that make the function call twice.

The grid call it once and then you call it.

since e.NewValues ("DictionaryName") apear to contain the corect values, i dont know why it dont work....

 

 

by: noobe1Posted on 2009-03-11 at 22:41:06ID: 23865083

If I remove ObjectDataSource1.Update() from from the code, the function is called only once with the OLD values.

 

by: davrob60Posted on 2009-03-12 at 05:53:02ID: 23867618

ok... i dont see why your object datasource dont bind, but here a suggestion

  1. turn your BoundField into template field. 
  2. replace your update Parameter with control parameters. "link" them to the news textbox in the template fields. 

 

by: noobe1Posted on 2009-03-17 at 20:21:53ID: 23915313

I finally found the solution. The problem lies with the function, not the objectdatasource.

I added DateUpdated and DateAdded as optional parameter to the function and it solved the problem.

    Public Shared Function UpdateDictionary(ByVal ID As String, ByVal DictionaryName As String, ByVal Author As String, Optional ByVal DateAdded As String = "", Optional ByVal DateUpdated As String = "") As Integer

                                              
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by: davrob60Posted on 2009-03-18 at 06:28:13ID: 23918395

ok, now i see!

I`m glad you found your solution.

20120131-EE-VQP-002

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