ASP.NET ObjectDataSource problem

Question

This is the common structure of all of my classes:

public class User
{
    public int ID { get;set; }
    public string User_name { get; set; }
    public string Pass_word { get; set; }
    public string UserTypeCode { get; set; }

    public int SaveOrUpdate()
    {
        int id = -1;

        if (this._ID <=0)
        {
            id = this.Save();
        }
        else
        {
            bool success = this.Update();

            if(success)
            {
                id = this._ID;
            }
            else
            {
                throw new Exception("Update failed!");
            }
        }

        return id;
    }

    private int Save() { }
    private bool Update() { }
    public static User Get(int id) { }
    public static List<User> Get() { }
    public bool Delete() { }
}

I was using these classes smoothly with winforms.

But while working with ASP.NET, when I try to configure the object data source for a GridView, I don't find the method-names in the Data Source Configuration Wizard. I.e. they are not showing up. So my methods became useless.

I can't change this general structure of all of my classes. I have also a code generator written for them. And I must use ObjectDataSources.

My first question is, why don't they show up?

And, what should I do to make them show up?

Could you post the code from the aspx page and/or code-behind? That might be more helpful in spotting errors. — Mark Rogers
– Mark Rogers, Commented Nov 17, 2009 at 18:19
Oh nevermind, I guess your saying you can't even get the tags configured. — Mark Rogers
– Mark Rogers, Commented Nov 17, 2009 at 18:30

Forgotten Semicolon · Accepted Answer · 2009-11-17 18:15:30Z

3

ObjectDataSources look for methods within the type specified that match the signature of the update/insert method name and the update/insert parameters provided.

Your SaveOrUpdate method is on an instantiated class, and the ObjectDataSource will not find a matching method signature.

From what you have, if you must use ObjectDataSources, you may want to consider using a wrapper method. Example.

answered Nov 17, 2009 at 18:15

Forgotten Semicolon

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1 Comment

Mike Chaliy Over a year ago

+1 from me. Signature is important. So my answer is not correct.

Mike Chaliy · Accepted Answer · 2009-11-17 18:10:35Z

1

I am not quite sure, but you can try to mark this class with DataObjectAttribute and CRUD methods with DataObjectMethodAttribute. I did not use ObjectDataSource for ages, so can forget something.

answered Nov 17, 2009 at 18:10

Mike Chaliy

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1 Comment

Mike Chaliy Over a year ago

I know, you need special signature.

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