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Hierarchical WebGrid with custom strongly type classes

SAgosto — Thu, 20 May 2010 10:53:21 GMT

Hi Shawn,
If we do not include Global.asax, the session is not enabled automatically. That is why the InitializeDataSource is being called twice. I hope it helps. Thank you and have a nice day.
Best Regards,
Andi Santoso

This makes sense but my application already had a Global.asax that was working properly. Oddly, I removed/re-added it and the event is firing only once. Not sure why but it's fixed.

Thank you.

Hierarchical WebGrid with custom strongly type classes

andi@intersoftpt.com — Thu, 20 May 2010 10:48:26 GMT

Hi Shawn,

If we do not include Global.asax, the session is not enabled automatically. That is why the InitializeDataSource is being called twice. I hope it helps. Thank you and have a nice day.

Best Regards,

Andi Santoso

Hierarchical WebGrid with custom strongly type classes

SAgosto — Wed, 19 May 2010 13:10:29 GMT

Hi Shawn,
   It is weird then, I am having a problem to replicate the issue of yours. At first try, it is true that the OnInitializeDataSource is being called twice when I refreshed the grid from client side. However, when I added "Global.asax" file in my project, the OnInitializeDataSource is only being called once.
   Is it possible to provide me with your Global.asax for me to investigate them? Or perhaps, you can try to create a new project with only one file in it. Summon WebGrid and try to do the exact scenario with an empty Global.asax in your project, see if that event is being called twice or once.
   Thank you and have a nice day.
Best Regards,
Andi Santoso

Nice find! I re-added the Global.asax file and it stopped firing twice. *REALLY* odd. If you re-remove it, does it happen again for you? I wonder what is causing this.

Hierarchical WebGrid with custom strongly type classes

andi@intersoftpt.com — Wed, 19 May 2010 12:10:17 GMT

Hi Shawn,

It is weird then, I am having a problem to replicate the issue of yours. At first try, it is true that the OnInitializeDataSource is being called twice when I refreshed the grid from client side. However, when I added "Global.asax" file in my project, the OnInitializeDataSource is only being called once.

Is it possible to provide me with your Global.asax for me to investigate them? Or perhaps, you can try to create a new project with only one file in it. Summon WebGrid and try to do the exact scenario with an empty Global.asax in your project, see if that event is being called twice or once.

Thank you and have a nice day.

Best Regards,

Andi Santoso

Hierarchical WebGrid with custom strongly type classes

SAgosto — Wed, 19 May 2010 10:58:32 GMT

Hi Shawn,
   Please ensure that you have add the "Global.asax" file in your root project. If we do not define the file, the ASP.NET page framwork assumes that we have not defined any application or session event handlers. You can right click on your root project, create a new file of Global.asax and just leave it blank.
   In new Visual Studio 2010, I believe that, this file, "Global.asax" will be automatically included everytime we have created a new project.
   I hope it helps. Thank you and have a nice day.
Best Regards,
Andi Santoso.

That file does exist and is widely used for global error handling. I am not sure how this will cause the WebGrid's OnInitializeDataSource event to fire twice when the client-side WebGrid's refresh method is called?

Hierarchical WebGrid with custom strongly type classes

andi@intersoftpt.com — Wed, 19 May 2010 10:55:51 GMT

Hi Shawn,

Please ensure that you have add the "Global.asax" file in your root project. If we do not define the file, the ASP.NET page framwork assumes that we have not defined any application or session event handlers. You can right click on your root project, create a new file of Global.asax and just leave it blank.

In new Visual Studio 2010, I believe that, this file, "Global.asax" will be automatically included everytime we have created a new project.

I hope it helps. Thank you and have a nice day.

Best Regards,

Andi Santoso.

Hierarchical WebGrid with custom strongly type classes

SAgosto — Tue, 18 May 2010 10:12:20 GMT

Hi Shawn,
Unfortunately, using WebValue List, the WebGrid itself has to be bound to DataSource, since on declaring the WebValue List we used DataValueField to connect to the WebGrid itself. So like I mentioned before, using unBound grid and WebValue List is simply conflicting with the nature of the databinding concept. So it is not meant to be used that way.
I hope it helps. Thank you and have a nice day.
Best Regards,
Andi Santoso

I found a weird issue that I can only duplicate with this grid where the WebGrid's

OnInitializeDataSource event goes off twice whenever the grid is refreshed from the client-side. Can you confirm? If not, what else would cause this event to go off twice?

Hierarchical WebGrid with custom strongly type classes

andi@intersoftpt.com — Mon, 03 May 2010 22:16:46 GMT

Hi Shawn,

Unfortunately, using WebValue List, the WebGrid itself has to be bound to DataSource, since on declaring the WebValue List we used DataValueField to connect to the WebGrid itself. So like I mentioned before, using unBound grid and WebValue List is simply conflicting with the nature of the databinding concept. So it is not meant to be used that way.

I hope it helps. Thank you and have a nice day.

Best Regards,

Andi Santoso

Hierarchical WebGrid with custom strongly type classes

SAgosto — Mon, 03 May 2010 09:15:28 GMT

Hi Swan,
After I discuss this with our Developer, it seems that since we are using unBound WebGrid, we cannot using WebValue List. WebValue List should be used in WebGrid with bound data source, if not, it's simply conflicting with the nature of the databinding concept. I hope it helps. Thank you.
Best Regards,
Andi Santoso

Is there any work-around? If not, then WebValueList is not possible, at all, using strongly typed classes for a hierarical grid.

I did verify my code works after I removed the creating of the hierarchy structure within the code-behind (which is necessary for me).

Hierarchical WebGrid with custom strongly type classes

andi@intersoftpt.com — Mon, 03 May 2010 02:12:37 GMT

Hi Swan,

After I discuss this with our Developer, it seems that since we are using unBound WebGrid, we cannot using WebValue List. WebValue List should be used in WebGrid with bound data source, if not, it's simply conflicting with the nature of the databinding concept. I hope it helps. Thank you.

Best Regards,

Andi Santoso

Hierarchical WebGrid with custom strongly type classes

SAgosto — Wed, 17 Mar 2010 16:09:14 GMT

I have searched the tutorials/samples/forum for a way to bind a custom strongly typed class to a hierarchial WebGrid. In previous examples, I have used the WebGrid's OnInitializeDataSource event to retrieve a custom strongly typed object/class via a web service and bound to the WebGrid's DataSource property.

However, I am having problems using the hierarchal features of the WebGrid. The custom class has is flat and contains both header/child data and a relationship can be formed by various "ID" fields within the object. For example, consider the following data within the TransactionList object (List<TransactionList> data)

TransactionHeaderID TransactionHeaderName TransactionQueueID TransactionQueueName

1 Header 1 1 Queue 1

1 Header 1 2 Queue 2

2 Header 2 3 Queue 3

Is there a way using this data to have Header 1 with Queue 1/2 and Header 2 with Queue 3?