Question

I have following code in aspx page:

<asp:ObjectDataSource id="odsOuterSource" TypeName="my.namespace.page"
SelectMethod="GetTestObject" DataObjectTypeName="my.namespace.Entities.TestObject" />

<asp:ObjectDataSource id="odsInnerSource" TypeName="my.namespace.page"
SelectMethod="GetAnotherTestObject" 
DataObjectTypeName="my.namespace.Entities.AnotherTestObject" />

and following code in code-behind:

public TestObject GetTestObject()
{
    Logic myLogic = new MyLogic();
    return myLogic.GetTestObject();
}

public AnotherTestObject GetAnotherTestObject()
{
    Logic myLogic = new MyLogic();
    return myLogic.GetAnotherTestObject(testObject);
}

Now my question is if there is a way to get the TestObject which was returned by the OuterSource so that I could use it for the InnerSource without having to call GetTestObject again.

I hope you can help me with this.

Edit: For better readability than a comment

Thanks for your answers, but i have a question to Mudu’s answer:

Is there a way to do this if my OuterSource has a parameter?
For example

<asp:ObjectDataSource id="odsOuterSource" TypeName="my.namespace.page"
SelectMethod="GetTestObject" DataObjectTypeName="my.namespace.Entities.TestObject">
    <SelectParameters>
        <asp:QueryStringParameter Name="id" QueryStringField="id" DefaultValue="0" />
    </SelectParameters>
</asp:ObjectDataSource>

because then even my GetTestObject would have a parameter:

public TestObject GetTestObject(int id)
{
    Logic myLogic = new MyLogic();
    return myLogic.GetTestObject(id);
}

Answer 1

You could save it in a member, either as TestObject or as a Lazy<TestObject>:

private readonly Lazy<TestObject> myTestObject = new Lazy<TestObject>(() =>
{
    var myLogic = new MyLogic();
    return myLogic.GetTestObject();
});

With this code, you can receive it any number of times you want. It will be fetched via MyLogic once and re-returned on subsequent invocations:

public TestObject GetTestObject()
{
    return this.myTestObject.Value;
}

public AnotherTestObject GetAnotherTestObject()
{
    var testObject = this.myTestObject.Value; // re-used

    Logic myLogic = new MyLogic();
    return myLogic.GetAnotherTestObject(testObject);
}

As ASP.NET creates a new instance of your page for each request, the Lazy<TestObject> object is recreated for each request. Therefore, your TestObject is actually fetched once per request.