want override, but stuck on the inheritance

[BeemerBiker]

I want to use the C# example shown here

Ok, I have done simple overrides before so I coded up

protected override Auto...

well, I didnt even get that far as intellisense made it clear that AutoGeneratedField is not part of my class ..

public partial class printit : System.Web.UI.Page


So I tried adding "DetailView" to the class so I could inherit it (this was just a wild guess that once worked in c++ for me)

   public partial class printit : System.Web.UI.Page, System.Web.UI.WebControls.DetailsView
{
 

Anyway, the above does not work giving me a cannot have multiple base classes.

There is a really good example of what I want to do here but the author leaves the description on how to "use it" for a later date.

Question: What do I put in to my C# page that willl cause the override to be fired? I assume I have to inherit the class that does the firing and I do not know enough about inheritance to do this.

I have set GridView1.AutoGenerateColumns=True and coded up the following, but the override is never called.

 public class MyDetailsView : DetailsView
    {
        public MyDetailsView()
        {
        }
        protected override AutoGeneratedField CreateAutoGeneratedRow(AutoGeneratedFieldProperties fieldProperties)
        {
            AutoGeneratedField field = new AutoGeneratedField(fieldProperties.DataField);
            return field;
        }
 
    }
 
    public partial class printit : System.Web.UI.Page
    {
...rest of my program...
 

===wait wait wait===

ok, just realized I should have used MyGridView instead of the above "MyClass" and then used MyGridView when createing GridView1 . That gets me a bunch of new overrides though not the one I am looking for. However, I am in the right direction.

[Frinavale]

What exactly are you trying to accomplish?

You may be having problems with inheriting the AutoGeneratedField class because the specifications (that you linked us to) says the following:

AutoGeneratedField Class

Represents an automatically generated field in a data-bound control. This class cannot be inherited.

I have a feeling that you'll be interested in handling the GridView RowDataBound Event.

[tlhintoq]

If you are going to Override it in the child class, you must mark it Virtual in the Parent

[BeemerBiker]

@Frinavale
Frina: there is something wrong with the format of your post and I cannot quote it exactly as you posted it as you can see above.

Q: What exactly are you trying to accomplish?

I have a lookup table of Field names, Column captions, Column widths and DataFormatStrings. At RowCreated I lookup the fieldname and substitute my caption which could include <br>, set the width, and arrange for the correct format to be displayed. This actually worked decently except for a minor hack with the dataformatstring. The real problem occurred when I set AllowSorting to be true: Header.text no longer had the field names. I found the fieldnames at ((GridView)sender)._autoGenFieldProps but it was private, showed up only in the watch, and my entire lookup scheme that had worked perfectly, then failed. Not only was there nothing to lookup, but I discovered that if I stuck a caption at Header.Text, as I was wont to do, then the sort would not work as the linkbutton was not created.

Q: Specification says ..this class cannot be inherited..

Yea, not only that but it is a "sealed" class (FWIW)

Q: I have a feeling...

OK - It was a gut wrenching feeling, but I did get it all working thanks to an old bytes thread here I did learn something, but it was a huge hack by the time I got thru.

My original post was to find out how to set up the inheritance so my override worked. Something like the following worked:

public class MyGridView : GridView
{
    protected override AutoGeneratedField  CreateAutoGeneratedColumn(AutoGeneratedFieldProperties fieldProperties)
    {
        AutoGeneratedField field = new AutoGeneratedField(fieldProperties.DataField);
         return field;
    }
}
..
..
MyGridView GridView1 = new MyGridView()
 

In the above override I was able to lookup the field name and set the captions and still get the sort to work. Unfortuately, setting DataFormatString ended up as a true hack in every sense of the word and I had to use that reflection mechanism mentioned in an old thread in this forum.