Using Ninject with objectdatasource in asp.net webforms?

Question

I am trying to use Ninject 3 in my asp.net webforms application. It works fine except some pages that contains ObjectDataSource, the Select method of the ObjectDataSource throws a NullReferenceException. My code is as follows :

Web.Admin.Grades.aspx:

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
                    EnablePaging="true" TypeName="Web.Admin.Grades"
                    SelectMethod="GetData" SelectCountMethod="GetDataCount"
                    StartRowIndexParameterName="StartRowIndex" MaximumRowsParameterName="MaximumRows">
                    <SelectParameters>
                        <asp:ControlParameter ControlID="SearchTxtBox" Type="String" Name="SearchKeyWord" PropertyName="Text" />
                    </SelectParameters>
                </asp:ObjectDataSource>

Web.Admin.Grades.cs:

[Inject]
public IGradesRepository _Grades { get; set; }

public IList GetData(string SearchKeyWord, int StartRowIndex, int MaximumRows)
{
    return _Grades.GetGrades(SearchKeyWord, StartRowIndex, MaximumRows);
}

public int GetDataCount(string SearchKeyWord)
{
    return _Grades.GetGradesCount(SearchKeyWord);
}

Stacktrace and some more info as to how its all wired up and what you've tried would help (not a lot of people use ODS and if you can meet people half way they can help) — Ruben Bartelink
– Ruben Bartelink, Commented Mar 26, 2013 at 1:43
I start debugging the page and the injection happens but GetData method invoked _Grades is null, What happened? — Muhammad Alaa
– Muhammad Alaa, Commented Mar 26, 2013 at 8:31
I dunno - I'm not there :) Why do you think Ninject has been asked to inject into Web.Admin.Grades ? Ninject needs to have a reason to be be touching your instance - how are you configuring Ninject, what modules are you using. Show some of the wiring etc. — Ruben Bartelink
– Ruben Bartelink, Commented Mar 26, 2013 at 8:54
Web.Admin.Grades.cs is the codebehind file for the page Grades.aspx as in my previous comment when the page is called I start debugging and the property injection was called till now everything is ok but then the Select Method of ObjectDataSource is called which inside I use the injected property to get the data the property seems to be null, Am I supposed not to put the select method in the codebehind file or what I am doing wrong ? — Muhammad Alaa
– Muhammad Alaa, Commented Mar 26, 2013 at 9:02
Its what happens before your code that's obviously going wrong. How are you referencing Ninject. Can you link to the approach you are using to inject Ninject with ASP.NET ? What ASP.NET Version, What Ninject version. Wild guess: You have not told your page class to derive from the correct base. I'm not going to do any more guessing until you expand on how you're using Ninject — Ruben Bartelink
– Ruben Bartelink, Commented Mar 26, 2013 at 9:58

Muhammad Alaa · Accepted Answer · 2013-03-26 10:07:45Z

Sorry for misunderstanding I solve the problem as follows

 <asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
                EnablePaging="true" TypeName="Domain.Abstract.IGradesRepository"
                SelectMethod="GetGrades" SelectCountMethod="GetGradesCount"   OnObjectCreating="ObjectDataSource1_ObjectCreating"
                StartRowIndexParameterName="StartRowIndex" MaximumRowsParameterName="MaximumRows">
                <SelectParameters>
                    <asp:ControlParameter ControlID="SearchTxtBox" Type="String" Name="SearchKeyWord"  PropertyName="Text" />
                </SelectParameters>
            </asp:ObjectDataSource>

and Web.Admin.Grades.cs:

[Inject]
    public IGradesRepository _Grades { get; set; }
protected void ObjectDataSource1_ObjectCreating(object sender, ObjectDataSourceEventArgs e)
    {
        e.ObjectInstance = _Grades;
    }

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